Kazem Jamshidi-Ghaleh - Academia.edu (original) (raw)

Papers by Kazem Jamshidi-Ghaleh

The European Physical Journal D, 2013

ABSTRACT In this paper, the one-way absorption property in one-dimensional dielectric/metal photo... more ABSTRACT In this paper, the one-way absorption property in one-dimensional dielectric/metal photonic crystal structure with a dielectric defect layer is studied. The effects of incident angle and state of polarization on one-way absorption behaviour of the anti-resonant (AR) mode are investigated. The normally incident wave from left to right propagation is totally allowed to penetrate to the structure but right to left propagation totally reflected at the same wavelength. It is found that, with increasing of the incident angle, the AR mode shifts to the lower wavelengths and its intensity decreases. Simultaneously, another AR mode with reversed one-way property appears at higher wavelength. The one-way behaviour on absorption is observed at the both states of polarizations but is localized on different wavelengths. Those effects, are suggesting that the proposed structure can be used as a direction sense polarization splitter or reflector/antireflector device.

Materials Science in Semiconductor Processing, 2013

In this work, 40 μm biaxially oriented polypropylene (BOPP) polymer substrate is coated in a roll... more In this work, 40 μm biaxially oriented polypropylene (BOPP) polymer substrate is coated in a roll coater system. The single- and double-coated aluminium thin layers are analyzed by XRD, SEM, TEM, AFM and optical light microscopy. The size and density of pinholes are investigated by using TEM, the size of the pinholes are in the range of 0.8–8 μm, it is shown that with increasing sample thickness, the dimension of pinholes decreases. SEM and AFM are applied to study the surface morphology. The results show that the surface roughness of double-coated film is better than the single-coated one and the size of pinholes is smaller. The transmittance through the samples is measured on the UV–Vis range. The results show that double-coated film has significantly low transmittance (almost zero transmittance) in UV–Vis region.

Journal of Electromagnetic Waves and Applications, 2011

The European Physical Journal Applied Physics, 2014

Philosophical Magazine, 2014

Journal of Nanoscience and Nanotechnology, 2013

We attempted to fabricate multi-layer, thin film structures by catalytic chemical vapor depositio... more We attempted to fabricate multi-layer, thin film structures by catalytic chemical vapor deposition (Cat-CVD) at a low temperature (200 degrees C). A 5-10-nm-thick nanocrystalline silicon (nc-Si) layer was positioned asymmetrically between two silicon nitride (SINx) layers. The compositions of the SiNx layers were varied between silicon-rich and nitrogen-rich. Each layer was deposited continuously in the Cat-CVD chamber without post-annealing. High-resolution transmission electron microscopy (HRTEM) revealed that the nc-Si layer grew in columns on the surface of the bottom SiNx layer, and the columnar structure extended up to a few nanometers of the top SiNx layer. In photoluminescence (PL) spectra, the overall intensity increased with the thickness of the nc-Si layer, but the primary peak position changed more sensitively relative to the composition of the SiNx layers. Capacitance-voltage (C-V) hysteresis was observed only when 10-nm-thick nc-Si layers were inserted between the nitrogen-rich silicon nitride (NRSN) layers. Under a bias voltage of 5 V, the current in the sample with a 10-nm-thick nc-Si layer was higher by at least two orders of magnitude than that in the sample with a 5-nm-thick nc-Si layer. The I-V curve was fitted well using both the Fowler-Nordheim and the Poole-Frenkel models for electric fields of magnitudes greater than 1.1 MV/cm, thereby implying that both mechanisms contribute to the increase in the leakage current.

Philosophical Magazine, Sep 23, 2014

PbS nanocrystalline thin film was prepared by chemical bath deposition on Si(1 0 0) substrate at ... more PbS nanocrystalline thin film was prepared by chemical bath deposition on Si(1 0 0) substrate at bath temperatures of 25, 45 and 65 °C. Triethanolamine was added to the aqueous solution, which decreased the grain size and increased the luminescence of the nanocrystalline PbS thin film. PbS nanocrystals were identified using XRD, TEM and AFM. The crystalline size of the PbS film deposited at different bath temperatures was estimated by XRD and TEM to be 7–12 nm. The growth mechanism of the PbS crystallites were described at different bath temperatures. The confinement was reflected in the absorption spectra, photoluminescence excitation and photoluminescence spectra. The luminescence of Si(1 0 0) substrate and PbS nanocrystalline film deposited on Si(1 0 0) were compared, and the results revealed that the PbS nanocrystals altered and notably enhanced the emission features of the Si(1 0 0) substrate. The shifting of the maximum photoluminescence emission wavelength of PbS nanocrystals with a change in bath temperature and the variation in photoluminescent intensity of PbS nanocrystals prepared at 25 °C versus deposition time were investigated. A single-peak fit of a Gaussian function was employed to discern the photoluminescence of PbS on Si(1 0 0) substrate.

arXiv (Cornell University), Mar 8, 2022

Quantum vortices are the quantized version of classical vortices. Their center is a phase singula... more Quantum vortices are the quantized version of classical vortices. Their center is a phase singularity or vortex core around which the flow of particles as a whole circulates and is typical in superfluids, condensates and optical fields. However, the exploration of the motion of the phase singularities in coherently-coupled systems is still underway. We theoretically analyze the propagation of an interference dislocation in the regime of strong coupling between light and matter, with strong mass imbalance, corresponding to the case of microcavity exciton-polaritons. To this end, we utilize combinations of vortex and tightly focused Gaussian beams, which are introduced through resonant pulsed pumping. We show that a dislocation originates from self-interference fringes, due to the non-parabolic dispersion of polaritons combined with moving Rabi-oscillating vortices. The morphology of singularities is analyzed in the Poincaré space for the pseudospin associated to the polariton states. The resulting beam carries orbital angular momentum with decaying oscillations due to the loss of overlap between the normal modes of the polariton system.

Nucleation and Atmospheric Aerosols, 2007

The linear absorption coefficient, nonlinear absorption coefficient, nonlinear refractive index a... more The linear absorption coefficient, nonlinear absorption coefficient, nonlinear refractive index and optical limiting performance of a dye type acid (Fast Green FCF) ar measured under irradiation of 35 mW CW He-Ne Laser.

Optics Communications, Mar 1, 2007

ABSTRACT The nonlinear responses and optical limiting performance of a dye type acid, called fast... more ABSTRACT The nonlinear responses and optical limiting performance of a dye type acid, called fast green FCF, are investigated under irradiation of 35 mW continuous wave He–Ne Laser. The second order refractive index and nonlinear absorption coefficient are measured by use of z-Scan technique. The optical limiting behavior is investigated by transmission measurement through the sample. Linear absorption coefficient (α), nonlinear absorption coefficient (β) and second order refractive index (n2) of fast green FCF are measured at different concentrations.

Acta Physica Polonica A, Oct 1, 2009

In this paper, the nonlinear responses and optical properties modification in SK3 glass sample ar... more In this paper, the nonlinear responses and optical properties modification in SK3 glass sample are investigated. The nonlinear responses measurements were performed by using of nonlinear transmission monitoring of 200 fs at 800 nm laser pulses. The optical power limiting threshold of the sample is measured to be about 40 mJ/cm 2. The decrease of transmitted intensity is about 63% compared to the theoretical linear transmission at 270 mJ/cm 2 incident pulse energy. For prediction of the experimental nonlinear behavior results, a theoretical model based on three-photon absorption and absorption of free carriers is presented. By fitting of experimental data with theoretical model, three-photon absorption coefficient and free-carrier absorption cross-section are reported. The photo-induced optical properties modification of the SK3 sample is investigated also. The modifications that appear as darkening are observed below breakdown threshold intensity. To analyses of modified region sizes, the laser pulse energy accumulation model is applied.

Optics and Laser Technology, Jul 1, 2013

The Goos-Hänchen (GH) shift in one-dimensional photonic crystal (1DPC), composed of alternate e-n... more The Goos-Hänchen (GH) shift in one-dimensional photonic crystal (1DPC), composed of alternate e-negative and m-negative materials, is theoretically investigated. It is demonstrated that larger shifts can be obtained when surface modes are excited. It is also found that the magnitude of the lateral GH shift is closely related to intrinsic loss factor. The results show that for a definite value of loss and for values larger than that, backward surface waves which lead to negative lateral GH shifts can be excited. On the other hand, there are large positive GH shifts for small loss factor less than aforementioned definite loss. The GH shift is very sensitive to the thickness of air gap which is necessary to excitation of the surface waves.

European Physical Journal D, May 1, 2014

We have experimentally studied the optical bistable behavior in an optical ring cavity filled wit... more We have experimentally studied the optical bistable behavior in an optical ring cavity filled with a collection of three-level ⌳-type rubidium atoms, interacting with two collinearly propagating laser beams. The bistability so observed is very sensitive to the induced atomic coherence in this electromagnetically induced transparency system or consequently to the altered nonlinearity in the system and, thus, can easily be controlled by changing the intensity and the frequency detuning of the coupling field.

Acta Physica Polonica A, Feb 1, 2013

In this paper, the eect of a subwavelength thin layer on all-optical diode action in a one-dimens... more In this paper, the eect of a subwavelength thin layer on all-optical diode action in a one-dimensional photonic crystal is investigated. The photonic multilayer structure is considered as (BA) 6 (AB) 6 C(AABB) 6 , where layers A and B are nonlinear and linear materials respectively, and C is a thin layer with positive or negative-index material. The results are shown that by introducing a thin layer with dierent optical properties the all-optical diode eciency is controllable. In our numerical results, the transmission contrast of the structure, without the thin layer is obtained as 0.63, with a positive index material layer nearly zero and with a negative index material thin layer about 0.75.

Optics and Photonics Society of Iran, 2018

In the present paper, by increasing the radiation effect on convection heat term, the heat transf... more In the present paper, by increasing the radiation effect on convection heat term, the heat transfer equation was rewritten at the fiber amplifier. By numerical solving of the fourth order equation, the surface temperature of fiber amplifier was determined and then using it, the temperature and refractive index at any longitudinal and radial distance of fiber amplifier was determined. The temperature variation of different pump power was calculated and the results were interpreted.

Superlattices and Microstructures, 2017

properties of tunable filter in a 1D photonic crystal doped by an anisotropic metamaterial, Super... more properties of tunable filter in a 1D photonic crystal doped by an anisotropic metamaterial, Superlattices and Microstructures (2017),

Applied Physics A, 2002

. Microstructures of micrometer sizes are produced on the surface of polyethylene terephthalate... more . Microstructures of micrometer sizes are produced on the surface of polyethylene terephthalate using nanosecond Nd:YAG-laser irradiation at 266 nm wavelength. The stable and well-defined structures were investigated using scanning electron microscopy. A theoretical model is suggested for the nonlinear behavior of etch depth versus incident laser fluence. In this model, two-photon stepwise absorption of chromophores is the dominant mechanism.

Optics and Photonics Society of Iran, Mar 10, 2020

In this work, suspension polymerization is applied to fabricate monodisperse polymethylmethacryla... more In this work, suspension polymerization is applied to fabricate monodisperse polymethylmethacrylate (PMMA) microspheres with different diameters and the effect of the polymerization initiator's concentration on the size of the microspheres is studied. Then, the artificial opal photonic crystals are fabricated with PMMA microspheres using the vertical deposition via evaporation induced self-assembly method. Furthermore, the size of the microspheres and optical properties of opals are investigated. It is shown that the concentration of the

The European Physical Journal D, 2013

ABSTRACT In this paper, the one-way absorption property in one-dimensional dielectric/metal photo... more ABSTRACT In this paper, the one-way absorption property in one-dimensional dielectric/metal photonic crystal structure with a dielectric defect layer is studied. The effects of incident angle and state of polarization on one-way absorption behaviour of the anti-resonant (AR) mode are investigated. The normally incident wave from left to right propagation is totally allowed to penetrate to the structure but right to left propagation totally reflected at the same wavelength. It is found that, with increasing of the incident angle, the AR mode shifts to the lower wavelengths and its intensity decreases. Simultaneously, another AR mode with reversed one-way property appears at higher wavelength. The one-way behaviour on absorption is observed at the both states of polarizations but is localized on different wavelengths. Those effects, are suggesting that the proposed structure can be used as a direction sense polarization splitter or reflector/antireflector device.

Materials Science in Semiconductor Processing, 2013

In this work, 40 μm biaxially oriented polypropylene (BOPP) polymer substrate is coated in a roll... more In this work, 40 μm biaxially oriented polypropylene (BOPP) polymer substrate is coated in a roll coater system. The single- and double-coated aluminium thin layers are analyzed by XRD, SEM, TEM, AFM and optical light microscopy. The size and density of pinholes are investigated by using TEM, the size of the pinholes are in the range of 0.8–8 μm, it is shown that with increasing sample thickness, the dimension of pinholes decreases. SEM and AFM are applied to study the surface morphology. The results show that the surface roughness of double-coated film is better than the single-coated one and the size of pinholes is smaller. The transmittance through the samples is measured on the UV–Vis range. The results show that double-coated film has significantly low transmittance (almost zero transmittance) in UV–Vis region.

Journal of Electromagnetic Waves and Applications, 2011

The European Physical Journal Applied Physics, 2014

Philosophical Magazine, 2014

Journal of Nanoscience and Nanotechnology, 2013

We attempted to fabricate multi-layer, thin film structures by catalytic chemical vapor depositio... more We attempted to fabricate multi-layer, thin film structures by catalytic chemical vapor deposition (Cat-CVD) at a low temperature (200 degrees C). A 5-10-nm-thick nanocrystalline silicon (nc-Si) layer was positioned asymmetrically between two silicon nitride (SINx) layers. The compositions of the SiNx layers were varied between silicon-rich and nitrogen-rich. Each layer was deposited continuously in the Cat-CVD chamber without post-annealing. High-resolution transmission electron microscopy (HRTEM) revealed that the nc-Si layer grew in columns on the surface of the bottom SiNx layer, and the columnar structure extended up to a few nanometers of the top SiNx layer. In photoluminescence (PL) spectra, the overall intensity increased with the thickness of the nc-Si layer, but the primary peak position changed more sensitively relative to the composition of the SiNx layers. Capacitance-voltage (C-V) hysteresis was observed only when 10-nm-thick nc-Si layers were inserted between the nitrogen-rich silicon nitride (NRSN) layers. Under a bias voltage of 5 V, the current in the sample with a 10-nm-thick nc-Si layer was higher by at least two orders of magnitude than that in the sample with a 5-nm-thick nc-Si layer. The I-V curve was fitted well using both the Fowler-Nordheim and the Poole-Frenkel models for electric fields of magnitudes greater than 1.1 MV/cm, thereby implying that both mechanisms contribute to the increase in the leakage current.

Philosophical Magazine, Sep 23, 2014

PbS nanocrystalline thin film was prepared by chemical bath deposition on Si(1 0 0) substrate at ... more PbS nanocrystalline thin film was prepared by chemical bath deposition on Si(1 0 0) substrate at bath temperatures of 25, 45 and 65 °C. Triethanolamine was added to the aqueous solution, which decreased the grain size and increased the luminescence of the nanocrystalline PbS thin film. PbS nanocrystals were identified using XRD, TEM and AFM. The crystalline size of the PbS film deposited at different bath temperatures was estimated by XRD and TEM to be 7–12 nm. The growth mechanism of the PbS crystallites were described at different bath temperatures. The confinement was reflected in the absorption spectra, photoluminescence excitation and photoluminescence spectra. The luminescence of Si(1 0 0) substrate and PbS nanocrystalline film deposited on Si(1 0 0) were compared, and the results revealed that the PbS nanocrystals altered and notably enhanced the emission features of the Si(1 0 0) substrate. The shifting of the maximum photoluminescence emission wavelength of PbS nanocrystals with a change in bath temperature and the variation in photoluminescent intensity of PbS nanocrystals prepared at 25 °C versus deposition time were investigated. A single-peak fit of a Gaussian function was employed to discern the photoluminescence of PbS on Si(1 0 0) substrate.

arXiv (Cornell University), Mar 8, 2022

Quantum vortices are the quantized version of classical vortices. Their center is a phase singula... more Quantum vortices are the quantized version of classical vortices. Their center is a phase singularity or vortex core around which the flow of particles as a whole circulates and is typical in superfluids, condensates and optical fields. However, the exploration of the motion of the phase singularities in coherently-coupled systems is still underway. We theoretically analyze the propagation of an interference dislocation in the regime of strong coupling between light and matter, with strong mass imbalance, corresponding to the case of microcavity exciton-polaritons. To this end, we utilize combinations of vortex and tightly focused Gaussian beams, which are introduced through resonant pulsed pumping. We show that a dislocation originates from self-interference fringes, due to the non-parabolic dispersion of polaritons combined with moving Rabi-oscillating vortices. The morphology of singularities is analyzed in the Poincaré space for the pseudospin associated to the polariton states. The resulting beam carries orbital angular momentum with decaying oscillations due to the loss of overlap between the normal modes of the polariton system.

Nucleation and Atmospheric Aerosols, 2007

The linear absorption coefficient, nonlinear absorption coefficient, nonlinear refractive index a... more The linear absorption coefficient, nonlinear absorption coefficient, nonlinear refractive index and optical limiting performance of a dye type acid (Fast Green FCF) ar measured under irradiation of 35 mW CW He-Ne Laser.

Optics Communications, Mar 1, 2007

ABSTRACT The nonlinear responses and optical limiting performance of a dye type acid, called fast... more ABSTRACT The nonlinear responses and optical limiting performance of a dye type acid, called fast green FCF, are investigated under irradiation of 35 mW continuous wave He–Ne Laser. The second order refractive index and nonlinear absorption coefficient are measured by use of z-Scan technique. The optical limiting behavior is investigated by transmission measurement through the sample. Linear absorption coefficient (α), nonlinear absorption coefficient (β) and second order refractive index (n2) of fast green FCF are measured at different concentrations.

Acta Physica Polonica A, Oct 1, 2009

In this paper, the nonlinear responses and optical properties modification in SK3 glass sample ar... more In this paper, the nonlinear responses and optical properties modification in SK3 glass sample are investigated. The nonlinear responses measurements were performed by using of nonlinear transmission monitoring of 200 fs at 800 nm laser pulses. The optical power limiting threshold of the sample is measured to be about 40 mJ/cm 2. The decrease of transmitted intensity is about 63% compared to the theoretical linear transmission at 270 mJ/cm 2 incident pulse energy. For prediction of the experimental nonlinear behavior results, a theoretical model based on three-photon absorption and absorption of free carriers is presented. By fitting of experimental data with theoretical model, three-photon absorption coefficient and free-carrier absorption cross-section are reported. The photo-induced optical properties modification of the SK3 sample is investigated also. The modifications that appear as darkening are observed below breakdown threshold intensity. To analyses of modified region sizes, the laser pulse energy accumulation model is applied.

Optics and Laser Technology, Jul 1, 2013

The Goos-Hänchen (GH) shift in one-dimensional photonic crystal (1DPC), composed of alternate e-n... more The Goos-Hänchen (GH) shift in one-dimensional photonic crystal (1DPC), composed of alternate e-negative and m-negative materials, is theoretically investigated. It is demonstrated that larger shifts can be obtained when surface modes are excited. It is also found that the magnitude of the lateral GH shift is closely related to intrinsic loss factor. The results show that for a definite value of loss and for values larger than that, backward surface waves which lead to negative lateral GH shifts can be excited. On the other hand, there are large positive GH shifts for small loss factor less than aforementioned definite loss. The GH shift is very sensitive to the thickness of air gap which is necessary to excitation of the surface waves.

European Physical Journal D, May 1, 2014

We have experimentally studied the optical bistable behavior in an optical ring cavity filled wit... more We have experimentally studied the optical bistable behavior in an optical ring cavity filled with a collection of three-level ⌳-type rubidium atoms, interacting with two collinearly propagating laser beams. The bistability so observed is very sensitive to the induced atomic coherence in this electromagnetically induced transparency system or consequently to the altered nonlinearity in the system and, thus, can easily be controlled by changing the intensity and the frequency detuning of the coupling field.

Acta Physica Polonica A, Feb 1, 2013

In this paper, the eect of a subwavelength thin layer on all-optical diode action in a one-dimens... more In this paper, the eect of a subwavelength thin layer on all-optical diode action in a one-dimensional photonic crystal is investigated. The photonic multilayer structure is considered as (BA) 6 (AB) 6 C(AABB) 6 , where layers A and B are nonlinear and linear materials respectively, and C is a thin layer with positive or negative-index material. The results are shown that by introducing a thin layer with dierent optical properties the all-optical diode eciency is controllable. In our numerical results, the transmission contrast of the structure, without the thin layer is obtained as 0.63, with a positive index material layer nearly zero and with a negative index material thin layer about 0.75.

Optics and Photonics Society of Iran, 2018

In the present paper, by increasing the radiation effect on convection heat term, the heat transf... more In the present paper, by increasing the radiation effect on convection heat term, the heat transfer equation was rewritten at the fiber amplifier. By numerical solving of the fourth order equation, the surface temperature of fiber amplifier was determined and then using it, the temperature and refractive index at any longitudinal and radial distance of fiber amplifier was determined. The temperature variation of different pump power was calculated and the results were interpreted.

Superlattices and Microstructures, 2017

properties of tunable filter in a 1D photonic crystal doped by an anisotropic metamaterial, Super... more properties of tunable filter in a 1D photonic crystal doped by an anisotropic metamaterial, Superlattices and Microstructures (2017),

Applied Physics A, 2002

. Microstructures of micrometer sizes are produced on the surface of polyethylene terephthalate... more . Microstructures of micrometer sizes are produced on the surface of polyethylene terephthalate using nanosecond Nd:YAG-laser irradiation at 266 nm wavelength. The stable and well-defined structures were investigated using scanning electron microscopy. A theoretical model is suggested for the nonlinear behavior of etch depth versus incident laser fluence. In this model, two-photon stepwise absorption of chromophores is the dominant mechanism.

Optics and Photonics Society of Iran, Mar 10, 2020

In this work, suspension polymerization is applied to fabricate monodisperse polymethylmethacryla... more In this work, suspension polymerization is applied to fabricate monodisperse polymethylmethacrylate (PMMA) microspheres with different diameters and the effect of the polymerization initiator's concentration on the size of the microspheres is studied. Then, the artificial opal photonic crystals are fabricated with PMMA microspheres using the vertical deposition via evaporation induced self-assembly method. Furthermore, the size of the microspheres and optical properties of opals are investigated. It is shown that the concentration of the