Rodger Walser - Academia.edu (original) (raw)

Papers by Rodger Walser

certifies that this is the approved version of the following dissertation: Magneto-optical studie... more certifies that this is the approved version of the following dissertation: Magneto-optical studies of field-driven propagation dynamics of domain walls in Permalloy nanowires and scaling of magnetic energy losses in Permalloy films and microstructures Committee:

AIP Conference Proceedings, 1979

We report the results of picosecond laser kinetic studies of the martensitic structural transform... more We report the results of picosecond laser kinetic studies of the martensitic structural transformation in VO2 at 340 °K where it undergoes a first order phase transition from a semiconductor (T~Tt). The time resolved excited state response of thin VO2 films to 35 psec pulses of optical gap photons (1.18ev) exhibited an initially coherent-like response and relaxed to a specific non-equilibrium state. The latter appears to be an alternative to the normal thermally excited state suggesting that the martensitic phase transition can be preempted by fast gap excitations.

AIP Conference Proceedings, 1975

In this paper we present the results of the pyromagnetic measurements on CoS2−xSex single crystal... more In this paper we present the results of the pyromagnetic measurements on CoS2−xSex single crystals in the frequency range of 100 Hz to 10 MHz. The high frequency response measurements reveal in these compounds the presence of a surface magnetic state with a Curie temperature higher than that of the bulk material. The surface Curie temperature, as well as the thickness of the surface region, depends on the level of selenium doping: the depth of the surface region increases with higher level of selenium doping and varies from about 0.5 to 25 microns. The cause for the existence of the surface magnetic state is believed to be a uniform selenium deficiency in a surface region.

MRS Proceedings, 1990

According to a recent model [1], the enhancement in the rate of the solid phase epitaxial regrowt... more According to a recent model [1], the enhancement in the rate of the solid phase epitaxial regrowth (SPER) of silicon produced by implanted impurities is determined by the superposition of reconstruction at sites that capture neutral, and ionized, three-fold coordinated dangling bond states. Considerable support for this model is derived from experiments on ionization-enhanced SPER in silicon. In this paper we discuss how this dangling bond model (DBM) could be used to determine the densities of neutral dangling bonds and ionized impurities in amorphous silicon from these experimental results. Both densities, determined by a self-consistent calculation, are in good agreement with those measured by other types of experiments. This result provides further support for the DBM and indicates that simultaneous SPER and ESR measurements could make it possible to depth profile low concentrations of ionized impurities in amorphous silicon.

Thesis the University of Texas at Austin Source Dai B 59 09 P 5046 Mar 1999 342 Pages, 1998

This dissertation analytically and experimentally demonstrated a conceptual solution for the high... more This dissertation analytically and experimentally demonstrated a conceptual solution for the high-resolution position sensing, and torque sensing requirements of precision, intelligent machines. The method included an evaluation of the advanced actuators non-linearities and parametric coupling. An analysis of current industrial and research-level sensing practices in robots will be conducted. The purpose of this analysis established the degree to which current practices adequately address the precision requirements of advanced machines. Subsequently, based on this need and relevance, an investigation and analysis of the primary actuator level sensors was conducted. The physics and technologies were identified and measured relative each other and the actuator requirements. A select down of the technologies was conducted. The magnetoresistive phenomenon was investigated in-depth. The performance of the magnetic recording channel has been analyzed relative to the rotary encoder requirements of the advanced actuator. Based on this investigation, through the application of a set of governing design equations, a MR encoder model has been developed. This model includes system non-linearities and noise sources. Both the MR encoder and MR torque sensor conceptual designs have been presented. Limitations in current technology have been identified and proposed alternatives proposed. Finally, the MR encoder concept has been simulated. An experimental test-bed has been developed to collect actual MR read head signals and incorporated into the model. The data has been summarized and the future research identified.

Aps March Meeting Abstracts, Mar 1, 2000

Abstract : A study has been made of the feasibility of using the pyromagnetic effect for detectin... more Abstract : A study has been made of the feasibility of using the pyromagnetic effect for detecting electromagnetic radiation. In the pyromagnetic detector, a voltage is induced in a coil surrounding a magnetic material when that material is subjected to a heat pulse. This voltage, which is the exact dual of the induced current in a capacitor due to the well known pyroelectric effect, is generated by the time varying magnetization component that results from the thermal perturbations. The pyromagnetic response of both first and second order transition materials was investigated as the material was warmed through the transition region. The very first measurements with gadolinium confirmed the intended goal of this feasibility study and the research effort concentrated on several aspects related to optimization. Typical sensitivities were on the order of 0.1 microvolt/watt/coil turn but the NEP was always limited by stray pickup. These measurements were performed with common phase detection techniques with beam chopping rates from 10 to 1000 Hz. In view of these initial measurements, it is felt that a detector using the pyromagnetic effect has promise as a fast, sensitive, room temperature detector for the range of frequencies from microwave to optical. (Author)

SPIE Proceedings, 2001

Metamaterials are so-named to recognize and emphasize their purpose, which is to achieve material... more Metamaterials are so-named to recognize and emphasize their purpose, which is to achieve material performance beyond the limitations of conventional composites. The holy grail of conventional composite design is to achieve an optimum combination of the constituent's properties without requiring that they react. Success is measured by how close the composite properties are to a volumetric average of those of its constituents. One of the goals of this paper is to outline the strategy of metamaterial design, its hallmark being the exploitation of low dimensional phenomena to extend composite performance. Another is to discuss the generality of the metamaterial strategy, and to illustrate its successful implementation in diverse application areas. It is also shown that ideal electromagnetic composite responses cannot be achieved by implementing designs based on utilizing the prevalent effective media theories. More disturbing is the observation that the deviation of the composite response from the ideal is greatest when the disparity of the constituent properties is largest. Unfortunately, this is the situation of most interest, where a volumetrically averaged response has the greatest practical value. This response can be achieved, however, by utilizing electromagnetic metamaterials design. The rules for this approach are illustrated by the successful design of a laminated electromagnetic composite that possesses some remarkable, and previously unattainable properties.

INTERMAG 2000 Digest of Technical Papers. 2000 IEEE International Magnetics Conference

Scripta Metallurgica, 1982

SPIE Proceedings, 1993

ABSTRACT A new theoretical framework for modeling the nonlinear laser heating of semiconductors i... more ABSTRACT A new theoretical framework for modeling the nonlinear laser heating of semiconductors is presented by incorporating the dynamical behavior of semiconductors; the temperature-carrier coupling, the generation and recombination of defects, the diffusion of defects, the diffusion of impurities by defect-dopant pair mechanism, and chemical reaction between species. In this study, we apply our model to n-type silicon irradiated by a nanosecond pulsed Nd:YAG laser. The dynamical evolution of laser-semiconductor interaction process is examined by calculation of carrier, defect, and impurity concentration profiles.

SPIE Proceedings, 1991

... HM Musal," Thermomechanical stress degradation of metal mirror surfaces under pulsed-las... more ... HM Musal," Thermomechanical stress degradation of metal mirror surfaces under pulsed-laserirradiation," in Laser ... K. Furuya and T Kainuma," Effects of alloying and heat treatment on the ... M. Sparks and E. Loh Jr.," Temperature dependence of absorptance in laser-damage of ...

Laser Optics for Intracavity and Extracavity Applications, 1988

The accumulation dependence of damage and laser induced damage morphologies on single crystal met... more The accumulation dependence of damage and laser induced damage morphologies on single crystal metal surfaces have been observed under Q-switched 1064 nm Nd:YAG laser irradiation at 10 nsec pulses at a 10 Hz rate. Several different damage morphologies were observed: slip-line formation, ripple patterns, flat-melting, and boiling. Damage probability versus fluence curves and accumulation curves are plotted to investigate damage behavior as it correlates with morphology. Accumulation curves showed different damage behavior for crystals of different orientation. Threshold decrease due to accumulation was the largest on (111) Cu and Al surfaces, whidh also had the lowest single shot damage threshold. The threshold reduction in accumulation follows the equation FN = F1 NS-1 where FN is the N-pulse damage threshold, N the pulse number, and S the slope of the accumulation curve. Accumulation appears to be the result of the storage cycle of thermal stress-strain energy induced by each laser pulse, and multi-pulse damage results from plastic slip and fatigue.

Materials for Optical Switches, Isolators, and Limiters, 1989

Laser-induced morphological and electrical changes to silicon CCD devices have been studied. The ... more Laser-induced morphological and electrical changes to silicon CCD devices have been studied. The devices were poly-silicon gate Time Delay Integrating (TDI) CCD arrays of 2048x96 elements. The laser source for these experiments was a Q-switched Nd:YAG laser at 1.06 μm with 10 ns pulses at a 10 Hz repetition rate focused to an approximately 400 μm spot radius. Single pulse and multiple pulse damage behavior was studied. Both CCD arrays and diagnostic structures from the wafer periphery were tested. The additional diagnostic structures included poly-Si resistors and MOS-FET gates. Of the measurements made, it was found that drain-to-substrate and drain-to-source leakage currents and transconductance in FETs were the most sensitive parameters to laser-induced change. The onset of electrical parameter changes was observed as low as 0.2 J/cm2. Severe electrical parameter changes began at 0.5 J/cm2 and continued up to the onset of severe morphological damage at 1.0 J/cm2. Above this fluence, both poly-Si and aluminum interconnect lines were melted and broken.

Introduction to Complex Mediums for Optics and Electromagnetics

Metamaterials, so named to recognize and emphasize their purpose, aim to achieve material perform... more Metamaterials, so named to recognize and emphasize their purpose, aim to achieve material performance "€œbeyond"€ the limitations of conventional composites. The holy grail of conventional composite design is to achieve composite properties that are a volumetric average of those of its constituents. One of the goals of this chapter is to outline the strategy of metamaterial design, its hallmark being the exploitation of low dimensionality to extend composite performance. Another goal is to discuss the generality of the metamaterial strategy, and to illustrate its successful implementation in diverse application areas. Finally, the use of metamaterial synthesis to achieve nearly ideal electromagnetic composite responses is discussed. The rules for this approach are illustrated by outlining the design of a laminated electromagnetic composite that possesses some remarkable and previously unobserved properties.

SPIE Proceedings, 1993

The `smartness' of the optical position sensitive detector (PSD) lies in its capability to r... more The `smartness' of the optical position sensitive detector (PSD) lies in its capability to read the centroid position of the incident optical intensity distribution, independent of total intensity. Most measurands of interest to the smart structures community can be made to appear as changes in spatial distributions of optical intensity, such as interference pattern shifts, motion of reflected spots from moving or deforming objects, or changes in relative intensity among two or more light sources. In this work we demonstrate a technique to make a PSD smarter, in this case capable of reading centroid positions of multiple light intensity distributions which are modulated at different frequencies. This capability can be exploited in multi-degree-of- freedom position sensors as well as for multiplexing outputs from sensors distributed over a smart structure or skin. In this novel operating mode, the PSD behaves as a transmission line with detectors at either end and a current source at the centroid. Measurements of phase difference versus spot position for different modulation frequencies show good agreement with a superposition-based numerical model. Multiple light distributions incident on the same PSD can be frequency multiplexed. Spatial resolution increases with modulation frequency for positions near the center of the working range.

MRS Proceedings, 1988

ABSTRACTIn this work we measured the functional dependence of the solid phase epitaxial (SPE) reg... more ABSTRACTIn this work we measured the functional dependence of the solid phase epitaxial (SPE) regrowth of amorphous silicon on the implanted phosphorous concentration, Np. The growth rates of self-ion amorphized layers in silicon wafers with (100) substrate orientation were measured by in situ, high precision, isothermal cw laser interferometry for temperatures from 460°C to 590°C, and concentrations in the range 2x1017 cm-3

Laser Induced Damage in Optical Materials: 1989

Laser-induced damage in two types of silicon photosensor array has been studied. The samples were... more Laser-induced damage in two types of silicon photosensor array has been studied. The samples were MOS CCD time delay integration (TDI) sensors with a 2048x96 element array of pixels and CID photodiode arrays of 512x1 pixels. The laser source was a Q-switched 1064 nm Nd:YAG laser (10 Hz rep rate, 10 ns pulses with a 250 A‚µm spot radius). Tests for morphological and electrical damage to the CCD arrays have been reported previously. In new experiments, the micro-damage morphology is examined and correlated with both the observed electrical degradation and newly observed stress effects. We report the observation of surface deformation and lattice defects due to laser-induced stresses in the SiO2 and poly-silicon thin films on the silicon substrate. Measurements of damage for the CID arrays show them to be more resistant to laser damage than MOS structures such as CCD arrays. In addition, electrical degradation of these arrays was observed which affected the video output signal from the devices.

Thin Solid Films, 1995

... As the substrate bias was increased, the Co grain size and the grain isolation decreased but ... more ... As the substrate bias was increased, the Co grain size and the grain isolation decreased but the increased Co (10TO) crystal enhanced the coercivity. ... Magn., 25(1992) 3079. [4] P.Glijer, JM Sivertsen and JH Judy, J. Appt. Phys., 73 ( 1993) 5563. ...

certifies that this is the approved version of the following dissertation: Magneto-optical studie... more certifies that this is the approved version of the following dissertation: Magneto-optical studies of field-driven propagation dynamics of domain walls in Permalloy nanowires and scaling of magnetic energy losses in Permalloy films and microstructures Committee:

AIP Conference Proceedings, 1979

We report the results of picosecond laser kinetic studies of the martensitic structural transform... more We report the results of picosecond laser kinetic studies of the martensitic structural transformation in VO2 at 340 °K where it undergoes a first order phase transition from a semiconductor (T~Tt). The time resolved excited state response of thin VO2 films to 35 psec pulses of optical gap photons (1.18ev) exhibited an initially coherent-like response and relaxed to a specific non-equilibrium state. The latter appears to be an alternative to the normal thermally excited state suggesting that the martensitic phase transition can be preempted by fast gap excitations.

AIP Conference Proceedings, 1975

In this paper we present the results of the pyromagnetic measurements on CoS2−xSex single crystal... more In this paper we present the results of the pyromagnetic measurements on CoS2−xSex single crystals in the frequency range of 100 Hz to 10 MHz. The high frequency response measurements reveal in these compounds the presence of a surface magnetic state with a Curie temperature higher than that of the bulk material. The surface Curie temperature, as well as the thickness of the surface region, depends on the level of selenium doping: the depth of the surface region increases with higher level of selenium doping and varies from about 0.5 to 25 microns. The cause for the existence of the surface magnetic state is believed to be a uniform selenium deficiency in a surface region.

MRS Proceedings, 1990

According to a recent model [1], the enhancement in the rate of the solid phase epitaxial regrowt... more According to a recent model [1], the enhancement in the rate of the solid phase epitaxial regrowth (SPER) of silicon produced by implanted impurities is determined by the superposition of reconstruction at sites that capture neutral, and ionized, three-fold coordinated dangling bond states. Considerable support for this model is derived from experiments on ionization-enhanced SPER in silicon. In this paper we discuss how this dangling bond model (DBM) could be used to determine the densities of neutral dangling bonds and ionized impurities in amorphous silicon from these experimental results. Both densities, determined by a self-consistent calculation, are in good agreement with those measured by other types of experiments. This result provides further support for the DBM and indicates that simultaneous SPER and ESR measurements could make it possible to depth profile low concentrations of ionized impurities in amorphous silicon.

Thesis the University of Texas at Austin Source Dai B 59 09 P 5046 Mar 1999 342 Pages, 1998

This dissertation analytically and experimentally demonstrated a conceptual solution for the high... more This dissertation analytically and experimentally demonstrated a conceptual solution for the high-resolution position sensing, and torque sensing requirements of precision, intelligent machines. The method included an evaluation of the advanced actuators non-linearities and parametric coupling. An analysis of current industrial and research-level sensing practices in robots will be conducted. The purpose of this analysis established the degree to which current practices adequately address the precision requirements of advanced machines. Subsequently, based on this need and relevance, an investigation and analysis of the primary actuator level sensors was conducted. The physics and technologies were identified and measured relative each other and the actuator requirements. A select down of the technologies was conducted. The magnetoresistive phenomenon was investigated in-depth. The performance of the magnetic recording channel has been analyzed relative to the rotary encoder requirements of the advanced actuator. Based on this investigation, through the application of a set of governing design equations, a MR encoder model has been developed. This model includes system non-linearities and noise sources. Both the MR encoder and MR torque sensor conceptual designs have been presented. Limitations in current technology have been identified and proposed alternatives proposed. Finally, the MR encoder concept has been simulated. An experimental test-bed has been developed to collect actual MR read head signals and incorporated into the model. The data has been summarized and the future research identified.

Aps March Meeting Abstracts, Mar 1, 2000

Abstract : A study has been made of the feasibility of using the pyromagnetic effect for detectin... more Abstract : A study has been made of the feasibility of using the pyromagnetic effect for detecting electromagnetic radiation. In the pyromagnetic detector, a voltage is induced in a coil surrounding a magnetic material when that material is subjected to a heat pulse. This voltage, which is the exact dual of the induced current in a capacitor due to the well known pyroelectric effect, is generated by the time varying magnetization component that results from the thermal perturbations. The pyromagnetic response of both first and second order transition materials was investigated as the material was warmed through the transition region. The very first measurements with gadolinium confirmed the intended goal of this feasibility study and the research effort concentrated on several aspects related to optimization. Typical sensitivities were on the order of 0.1 microvolt/watt/coil turn but the NEP was always limited by stray pickup. These measurements were performed with common phase detection techniques with beam chopping rates from 10 to 1000 Hz. In view of these initial measurements, it is felt that a detector using the pyromagnetic effect has promise as a fast, sensitive, room temperature detector for the range of frequencies from microwave to optical. (Author)

SPIE Proceedings, 2001

Metamaterials are so-named to recognize and emphasize their purpose, which is to achieve material... more Metamaterials are so-named to recognize and emphasize their purpose, which is to achieve material performance beyond the limitations of conventional composites. The holy grail of conventional composite design is to achieve an optimum combination of the constituent's properties without requiring that they react. Success is measured by how close the composite properties are to a volumetric average of those of its constituents. One of the goals of this paper is to outline the strategy of metamaterial design, its hallmark being the exploitation of low dimensional phenomena to extend composite performance. Another is to discuss the generality of the metamaterial strategy, and to illustrate its successful implementation in diverse application areas. It is also shown that ideal electromagnetic composite responses cannot be achieved by implementing designs based on utilizing the prevalent effective media theories. More disturbing is the observation that the deviation of the composite response from the ideal is greatest when the disparity of the constituent properties is largest. Unfortunately, this is the situation of most interest, where a volumetrically averaged response has the greatest practical value. This response can be achieved, however, by utilizing electromagnetic metamaterials design. The rules for this approach are illustrated by the successful design of a laminated electromagnetic composite that possesses some remarkable, and previously unattainable properties.

INTERMAG 2000 Digest of Technical Papers. 2000 IEEE International Magnetics Conference

Scripta Metallurgica, 1982

SPIE Proceedings, 1993

ABSTRACT A new theoretical framework for modeling the nonlinear laser heating of semiconductors i... more ABSTRACT A new theoretical framework for modeling the nonlinear laser heating of semiconductors is presented by incorporating the dynamical behavior of semiconductors; the temperature-carrier coupling, the generation and recombination of defects, the diffusion of defects, the diffusion of impurities by defect-dopant pair mechanism, and chemical reaction between species. In this study, we apply our model to n-type silicon irradiated by a nanosecond pulsed Nd:YAG laser. The dynamical evolution of laser-semiconductor interaction process is examined by calculation of carrier, defect, and impurity concentration profiles.

SPIE Proceedings, 1991

... HM Musal," Thermomechanical stress degradation of metal mirror surfaces under pulsed-las... more ... HM Musal," Thermomechanical stress degradation of metal mirror surfaces under pulsed-laserirradiation," in Laser ... K. Furuya and T Kainuma," Effects of alloying and heat treatment on the ... M. Sparks and E. Loh Jr.," Temperature dependence of absorptance in laser-damage of ...

Laser Optics for Intracavity and Extracavity Applications, 1988

The accumulation dependence of damage and laser induced damage morphologies on single crystal met... more The accumulation dependence of damage and laser induced damage morphologies on single crystal metal surfaces have been observed under Q-switched 1064 nm Nd:YAG laser irradiation at 10 nsec pulses at a 10 Hz rate. Several different damage morphologies were observed: slip-line formation, ripple patterns, flat-melting, and boiling. Damage probability versus fluence curves and accumulation curves are plotted to investigate damage behavior as it correlates with morphology. Accumulation curves showed different damage behavior for crystals of different orientation. Threshold decrease due to accumulation was the largest on (111) Cu and Al surfaces, whidh also had the lowest single shot damage threshold. The threshold reduction in accumulation follows the equation FN = F1 NS-1 where FN is the N-pulse damage threshold, N the pulse number, and S the slope of the accumulation curve. Accumulation appears to be the result of the storage cycle of thermal stress-strain energy induced by each laser pulse, and multi-pulse damage results from plastic slip and fatigue.

Materials for Optical Switches, Isolators, and Limiters, 1989

Laser-induced morphological and electrical changes to silicon CCD devices have been studied. The ... more Laser-induced morphological and electrical changes to silicon CCD devices have been studied. The devices were poly-silicon gate Time Delay Integrating (TDI) CCD arrays of 2048x96 elements. The laser source for these experiments was a Q-switched Nd:YAG laser at 1.06 μm with 10 ns pulses at a 10 Hz repetition rate focused to an approximately 400 μm spot radius. Single pulse and multiple pulse damage behavior was studied. Both CCD arrays and diagnostic structures from the wafer periphery were tested. The additional diagnostic structures included poly-Si resistors and MOS-FET gates. Of the measurements made, it was found that drain-to-substrate and drain-to-source leakage currents and transconductance in FETs were the most sensitive parameters to laser-induced change. The onset of electrical parameter changes was observed as low as 0.2 J/cm2. Severe electrical parameter changes began at 0.5 J/cm2 and continued up to the onset of severe morphological damage at 1.0 J/cm2. Above this fluence, both poly-Si and aluminum interconnect lines were melted and broken.

Introduction to Complex Mediums for Optics and Electromagnetics

Metamaterials, so named to recognize and emphasize their purpose, aim to achieve material perform... more Metamaterials, so named to recognize and emphasize their purpose, aim to achieve material performance "€œbeyond"€ the limitations of conventional composites. The holy grail of conventional composite design is to achieve composite properties that are a volumetric average of those of its constituents. One of the goals of this chapter is to outline the strategy of metamaterial design, its hallmark being the exploitation of low dimensionality to extend composite performance. Another goal is to discuss the generality of the metamaterial strategy, and to illustrate its successful implementation in diverse application areas. Finally, the use of metamaterial synthesis to achieve nearly ideal electromagnetic composite responses is discussed. The rules for this approach are illustrated by outlining the design of a laminated electromagnetic composite that possesses some remarkable and previously unobserved properties.

SPIE Proceedings, 1993

The `smartness' of the optical position sensitive detector (PSD) lies in its capability to r... more The `smartness' of the optical position sensitive detector (PSD) lies in its capability to read the centroid position of the incident optical intensity distribution, independent of total intensity. Most measurands of interest to the smart structures community can be made to appear as changes in spatial distributions of optical intensity, such as interference pattern shifts, motion of reflected spots from moving or deforming objects, or changes in relative intensity among two or more light sources. In this work we demonstrate a technique to make a PSD smarter, in this case capable of reading centroid positions of multiple light intensity distributions which are modulated at different frequencies. This capability can be exploited in multi-degree-of- freedom position sensors as well as for multiplexing outputs from sensors distributed over a smart structure or skin. In this novel operating mode, the PSD behaves as a transmission line with detectors at either end and a current source at the centroid. Measurements of phase difference versus spot position for different modulation frequencies show good agreement with a superposition-based numerical model. Multiple light distributions incident on the same PSD can be frequency multiplexed. Spatial resolution increases with modulation frequency for positions near the center of the working range.

MRS Proceedings, 1988

ABSTRACTIn this work we measured the functional dependence of the solid phase epitaxial (SPE) reg... more ABSTRACTIn this work we measured the functional dependence of the solid phase epitaxial (SPE) regrowth of amorphous silicon on the implanted phosphorous concentration, Np. The growth rates of self-ion amorphized layers in silicon wafers with (100) substrate orientation were measured by in situ, high precision, isothermal cw laser interferometry for temperatures from 460°C to 590°C, and concentrations in the range 2x1017 cm-3

Laser Induced Damage in Optical Materials: 1989

Laser-induced damage in two types of silicon photosensor array has been studied. The samples were... more Laser-induced damage in two types of silicon photosensor array has been studied. The samples were MOS CCD time delay integration (TDI) sensors with a 2048x96 element array of pixels and CID photodiode arrays of 512x1 pixels. The laser source was a Q-switched 1064 nm Nd:YAG laser (10 Hz rep rate, 10 ns pulses with a 250 A‚µm spot radius). Tests for morphological and electrical damage to the CCD arrays have been reported previously. In new experiments, the micro-damage morphology is examined and correlated with both the observed electrical degradation and newly observed stress effects. We report the observation of surface deformation and lattice defects due to laser-induced stresses in the SiO2 and poly-silicon thin films on the silicon substrate. Measurements of damage for the CID arrays show them to be more resistant to laser damage than MOS structures such as CCD arrays. In addition, electrical degradation of these arrays was observed which affected the video output signal from the devices.

Thin Solid Films, 1995

... As the substrate bias was increased, the Co grain size and the grain isolation decreased but ... more ... As the substrate bias was increased, the Co grain size and the grain isolation decreased but the increased Co (10TO) crystal enhanced the coercivity. ... Magn., 25(1992) 3079. [4] P.Glijer, JM Sivertsen and JH Judy, J. Appt. Phys., 73 ( 1993) 5563. ...