Daniel Van Der Weide - Profile on Academia.edu (original) (raw)

Papers by Daniel Van Der Weide

Topics in Applied Physics, 2009

Public Reporting burden for this collection of information is estimated to average 1 hour per res... more Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time fP gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment reg of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for infonr Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188,) Washington, uLs. Lu.,v.

Public reporting burden for this collection of information in estimated to average 1 hour per res... more Public reporting burden for this collection of information in estimated to average 1 hour per response, including the time for reviewing instructions, searching existing dots (9 , the collection of information. Send comments regarding this turden estimate or any other aspect of this collection of information, including suggestions for reducir. Operations and Reports, 1215 Jefferson Davis Highway, Svate 1204, Arlington, VA 22202.4302, and to the Office of Management and Budget, Paperwork Reduction Pror....

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2005

We report a new process combining reactive ion etching ͑RIE͒ and deep RIE ͑DRIE͒ tools for microf... more We report a new process combining reactive ion etching ͑RIE͒ and deep RIE ͑DRIE͒ tools for microfabrication of high-aspect-ratio ͑HAR͒ silicon tips with heights Ͼ40 m and aspect ratios of 7. We integrate atomic force microscope ͑AFM͒ cantilevers with HAR tips and compare AFM scans using an HAR tip and a commercial tip. Our results demonstrate the advantage of HAR tips for metrology applications.

Coherent Fourier-Transform Spectroscopy Based on Infrared Frequency Combs

Fourier Transform Spectroscopy/ Hyperspectral Imaging and Sounding of the Environment, 2007

ABSTRACT

All-electronic free-space picosecond pulse generation and detection

Electronics Letters, 1991

Abstract An all-electronic system for generating, propagating and detecting picosecond electromag... more Abstract An all-electronic system for generating, propagating and detecting picosecond electromagnetic pulses using monolithic integrated circuits is described. With a 1.8 ps (10%-90%) nonlinear transmission line step generator driving a monopole antenna for ...

OPTICS 1 Highly accurate etching of ridge-waveguide directional couplers using in situ reflectance monitoring and periodic multilayers

Near-Field High-Frequency Probing

Scanning Probe Microscopy, 2007

... This experimentis depictedinFigure 2 (b), and is called near-field scanning optical microscopy... more ... This experimentis depictedinFigure 2 (b), and is called near-field scanning optical microscopy (NSOM). An example of a coated probe, with∼ 100 nm aperture is shown in Figure 2 (c). InNSOM, the aperture size imposes a limit on resolution. Page 337. I. 10. ...

Photon-assisted tunneling through a quantum dot at high microwave frequencies

We investigate the influence of high frequency microwave radiation on single electron tunneling t... more We investigate the influence of high frequency microwave radiation on single electron tunneling through a quantum dot. Effective coupling of the radiation to the quantum dot is achieved by an on-chip integrated broadband antenna. Simulations of the current distribution on the antenna are shown. We find that radiation with a frequency of ν=155 GHz, which corresponds to half of the bare charging energy Ec/2 results in an additional conductance peak within the Coulomb blockade regime. This additional resonance is attributed to photon-assisted tunneling.

Optics Express, 2005

We demonstrate real-time recording of chemical vapor fluctuations from 22 m away with a fast Four... more We demonstrate real-time recording of chemical vapor fluctuations from 22 m away with a fast Fourier-transform infrared (FTIR) spectrometer that uses a laser-like infrared probing beam generated from two 10-fs Ti:sapphire lasers. The FTIR's broad 9 − 12 µm spectrum in the "molecular fingerprint" region is dispersed by fast heterodyne self-scanning, enabling spectra at 2 cm −1 resolution to be recorded in 70 µs snapshots. We achieve continuous acquisition at a rate of 950 IR spectra per second by actively manipulating the repetition rate of one laser. Potential applications include video-rate chemical imaging and transient spectroscopy of e.g. gas plumes, flames and plasmas, and generally non-repetitive phenomena such as those found in protein folding dynamics and pulsed magnetic fields research.

Applied Physics Letters, 1997

We modify a scanning-force microscope tip/cantilever with a coaxial metal shield for use as an ul... more We modify a scanning-force microscope tip/cantilever with a coaxial metal shield for use as an ultra-small field probe, observing 30 ps waveforms on an integrated circuit at a spatial resolution set by the tip radius, the first direct measurements of electric field at these levels of temporal and spatial resolution. This new ability to acquire topography while maintaining constant tip-sample distance for calibrated measurement or excitation of near-zone picosecond time-resolved electric fields is useful not only for probing advanced circuits but also for localized broadband spectroscopy of condensed matter and biological samples.

Harmonic frequency comb mid-infrared Fourier-transform spectroscopy without moving part

ABSTRACT

Rapid, remote sensing with a coherent-comb infrared spectrometer

ABSTRACT

Parametric amplification and frequency up-conversion of high power RF pulses in nonlinear transmission lines

2011 IEEE Pulsed Power Conference, 2011

ABSTRACT This publication proposes a new concept for high power RF/microwave pulse generation, up... more ABSTRACT This publication proposes a new concept for high power RF/microwave pulse generation, up-conversion and amplification using nonlinear transmission lines with ferrites (or nonlinear dielectrics) that promote interaction of a high power RF wave with a co-propagating electromagnetic shock wave. This approach enables a multi-stage system in which frequency up-conversion and amplification occurs on each stage, allowing the accumulation of the energy in RF pulse from stage to stage.

Controllable wireless power delivery for biomedical implants

2014 IEEE Healthcare Innovation Conference (HIC), 2014

Top-gated Quantum Dots in Silicon / Silicon-Germanium Two-Dimensional Electron Gases

Electrons in silicon/silicon-germanium two-dimensional electron gas quantum dots are a promising ... more Electrons in silicon/silicon-germanium two-dimensional electron gas quantum dots are a promising architecture for spin based quantum computation. Top gated quantum dots allow precise tuning of electron shape and interdot coupling. We report the observation of Coulomb blockade in Si/SiGe quantum dots defined by a combination of etching and metal top gating. A narrow channel or mesa is fabricated by electron beam lithography and subsequent reactive ion etching. Metal gates are deposited across the channel to define the leads of the dot. The sides of dot are defined by surface depletion from the etched sidewalls. Low temperature measurements (250mK) show a single electron charging energy of about 0.8meV. We use an etch- defined side gate to vary the potential in the dot, observing several conductance oscillations as the blockade is lifted, with a period of 280mV.

Beam reshaping through excitation of magnetoinductive waves in metamaterials

2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007

ABSTRACT This paper studies both theoretically and experimentally, the excitation of magnetoinduc... more ABSTRACT This paper studies both theoretically and experimentally, the excitation of magnetoinductive waves in uniaxial composite metamaterial structures composed of split-ring resonators (SRRs). A slab of a magnetic metamaterial is excited by a monopole antenna and analyse the beam structure behind the slab. Though the scale of the composite constituents are much smaller then the wavelength of radiation, the approximation based on an effective medium fails to describe all observed effects, including the multiple beam splitting. A numerical algorithm is developed for describing the lattices of SRRs in terms of interacting dipoles, and confirm qualitatively the effects observed in experiment.

We investigate the experimental feasibility of detecting small malignant breast tumors using a re... more We investigate the experimental feasibility of detecting small malignant breast tumors using a recently proposed method of microwave imaging via space-time beamforming. A microwave sensor comprised of a planar synthetic array of compact ultrawideband (1-11 GHz) antennas is placed above a breast tissue phantom -a tank of homogeneous normal breast tissue simulant covered by a thin layer of skin simulant. A small (< 0.5 cm) synthetic tumor is embedded in the breast phantom. At each position in the array, the antenna transmits a synthetically generated ultra-short pulse into the breast phantom. A robust data-adaptive algorithm remove s the artifact caused by the dominant backscatter from the skin-breast interface. The signals are passed through a 3 -D space-time beamformer designed to image backscattered energy as a function of location. Even millimeter-sized malignant tumors have relatively large microwave scattering crosssections due to their significant dielectric-properties contrast with normal breast tissue. Therefore they produce localized regions of large backscatter energy levels in the beamformer image.

Nonlinear transmission lines in left-handed media

IEEE MTT-S International Microwave Symposium digest. IEEE MTT-S International Microwave Symposium

We introduce nonlinear transmission line (NLTL) based on left-handed (LH) media and simulate thir... more We introduce nonlinear transmission line (NLTL) based on left-handed (LH) media and simulate third-harmonic generation in a material that in two dimensions could also focus microwaves. We discuss physical phenomena that lead to and affect harmonic generation in LH NLTL and we outline advantages of LH NLTL media for developing a new type of frequency multiplier.

Switched-mode Microwave Ablation: Less Dependence on Tissue Properties Leads to More Consistent Ablations Than Phased Arrays

ABSTRACT

Topics in Applied Physics, 2009

Public Reporting burden for this collection of information is estimated to average 1 hour per res... more Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time fP gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment reg of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for infonr Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188,) Washington, uLs. Lu.,v.

Public reporting burden for this collection of information in estimated to average 1 hour per res... more Public reporting burden for this collection of information in estimated to average 1 hour per response, including the time for reviewing instructions, searching existing dots (9 , the collection of information. Send comments regarding this turden estimate or any other aspect of this collection of information, including suggestions for reducir. Operations and Reports, 1215 Jefferson Davis Highway, Svate 1204, Arlington, VA 22202.4302, and to the Office of Management and Budget, Paperwork Reduction Pror....

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2005

We report a new process combining reactive ion etching ͑RIE͒ and deep RIE ͑DRIE͒ tools for microf... more We report a new process combining reactive ion etching ͑RIE͒ and deep RIE ͑DRIE͒ tools for microfabrication of high-aspect-ratio ͑HAR͒ silicon tips with heights Ͼ40 m and aspect ratios of 7. We integrate atomic force microscope ͑AFM͒ cantilevers with HAR tips and compare AFM scans using an HAR tip and a commercial tip. Our results demonstrate the advantage of HAR tips for metrology applications.

Coherent Fourier-Transform Spectroscopy Based on Infrared Frequency Combs

Fourier Transform Spectroscopy/ Hyperspectral Imaging and Sounding of the Environment, 2007

ABSTRACT

All-electronic free-space picosecond pulse generation and detection

Electronics Letters, 1991

Abstract An all-electronic system for generating, propagating and detecting picosecond electromag... more Abstract An all-electronic system for generating, propagating and detecting picosecond electromagnetic pulses using monolithic integrated circuits is described. With a 1.8 ps (10%-90%) nonlinear transmission line step generator driving a monopole antenna for ...

OPTICS 1 Highly accurate etching of ridge-waveguide directional couplers using in situ reflectance monitoring and periodic multilayers

Near-Field High-Frequency Probing

Scanning Probe Microscopy, 2007

... This experimentis depictedinFigure 2 (b), and is called near-field scanning optical microscopy... more ... This experimentis depictedinFigure 2 (b), and is called near-field scanning optical microscopy (NSOM). An example of a coated probe, with∼ 100 nm aperture is shown in Figure 2 (c). InNSOM, the aperture size imposes a limit on resolution. Page 337. I. 10. ...

Photon-assisted tunneling through a quantum dot at high microwave frequencies

We investigate the influence of high frequency microwave radiation on single electron tunneling t... more We investigate the influence of high frequency microwave radiation on single electron tunneling through a quantum dot. Effective coupling of the radiation to the quantum dot is achieved by an on-chip integrated broadband antenna. Simulations of the current distribution on the antenna are shown. We find that radiation with a frequency of ν=155 GHz, which corresponds to half of the bare charging energy Ec/2 results in an additional conductance peak within the Coulomb blockade regime. This additional resonance is attributed to photon-assisted tunneling.

Optics Express, 2005

We demonstrate real-time recording of chemical vapor fluctuations from 22 m away with a fast Four... more We demonstrate real-time recording of chemical vapor fluctuations from 22 m away with a fast Fourier-transform infrared (FTIR) spectrometer that uses a laser-like infrared probing beam generated from two 10-fs Ti:sapphire lasers. The FTIR's broad 9 − 12 µm spectrum in the "molecular fingerprint" region is dispersed by fast heterodyne self-scanning, enabling spectra at 2 cm −1 resolution to be recorded in 70 µs snapshots. We achieve continuous acquisition at a rate of 950 IR spectra per second by actively manipulating the repetition rate of one laser. Potential applications include video-rate chemical imaging and transient spectroscopy of e.g. gas plumes, flames and plasmas, and generally non-repetitive phenomena such as those found in protein folding dynamics and pulsed magnetic fields research.

Applied Physics Letters, 1997

We modify a scanning-force microscope tip/cantilever with a coaxial metal shield for use as an ul... more We modify a scanning-force microscope tip/cantilever with a coaxial metal shield for use as an ultra-small field probe, observing 30 ps waveforms on an integrated circuit at a spatial resolution set by the tip radius, the first direct measurements of electric field at these levels of temporal and spatial resolution. This new ability to acquire topography while maintaining constant tip-sample distance for calibrated measurement or excitation of near-zone picosecond time-resolved electric fields is useful not only for probing advanced circuits but also for localized broadband spectroscopy of condensed matter and biological samples.

Harmonic frequency comb mid-infrared Fourier-transform spectroscopy without moving part

ABSTRACT

Rapid, remote sensing with a coherent-comb infrared spectrometer

ABSTRACT

Parametric amplification and frequency up-conversion of high power RF pulses in nonlinear transmission lines

2011 IEEE Pulsed Power Conference, 2011

ABSTRACT This publication proposes a new concept for high power RF/microwave pulse generation, up... more ABSTRACT This publication proposes a new concept for high power RF/microwave pulse generation, up-conversion and amplification using nonlinear transmission lines with ferrites (or nonlinear dielectrics) that promote interaction of a high power RF wave with a co-propagating electromagnetic shock wave. This approach enables a multi-stage system in which frequency up-conversion and amplification occurs on each stage, allowing the accumulation of the energy in RF pulse from stage to stage.

Controllable wireless power delivery for biomedical implants

2014 IEEE Healthcare Innovation Conference (HIC), 2014

Top-gated Quantum Dots in Silicon / Silicon-Germanium Two-Dimensional Electron Gases

Electrons in silicon/silicon-germanium two-dimensional electron gas quantum dots are a promising ... more Electrons in silicon/silicon-germanium two-dimensional electron gas quantum dots are a promising architecture for spin based quantum computation. Top gated quantum dots allow precise tuning of electron shape and interdot coupling. We report the observation of Coulomb blockade in Si/SiGe quantum dots defined by a combination of etching and metal top gating. A narrow channel or mesa is fabricated by electron beam lithography and subsequent reactive ion etching. Metal gates are deposited across the channel to define the leads of the dot. The sides of dot are defined by surface depletion from the etched sidewalls. Low temperature measurements (250mK) show a single electron charging energy of about 0.8meV. We use an etch- defined side gate to vary the potential in the dot, observing several conductance oscillations as the blockade is lifted, with a period of 280mV.

Beam reshaping through excitation of magnetoinductive waves in metamaterials

2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007

ABSTRACT This paper studies both theoretically and experimentally, the excitation of magnetoinduc... more ABSTRACT This paper studies both theoretically and experimentally, the excitation of magnetoinductive waves in uniaxial composite metamaterial structures composed of split-ring resonators (SRRs). A slab of a magnetic metamaterial is excited by a monopole antenna and analyse the beam structure behind the slab. Though the scale of the composite constituents are much smaller then the wavelength of radiation, the approximation based on an effective medium fails to describe all observed effects, including the multiple beam splitting. A numerical algorithm is developed for describing the lattices of SRRs in terms of interacting dipoles, and confirm qualitatively the effects observed in experiment.

We investigate the experimental feasibility of detecting small malignant breast tumors using a re... more We investigate the experimental feasibility of detecting small malignant breast tumors using a recently proposed method of microwave imaging via space-time beamforming. A microwave sensor comprised of a planar synthetic array of compact ultrawideband (1-11 GHz) antennas is placed above a breast tissue phantom -a tank of homogeneous normal breast tissue simulant covered by a thin layer of skin simulant. A small (< 0.5 cm) synthetic tumor is embedded in the breast phantom. At each position in the array, the antenna transmits a synthetically generated ultra-short pulse into the breast phantom. A robust data-adaptive algorithm remove s the artifact caused by the dominant backscatter from the skin-breast interface. The signals are passed through a 3 -D space-time beamformer designed to image backscattered energy as a function of location. Even millimeter-sized malignant tumors have relatively large microwave scattering crosssections due to their significant dielectric-properties contrast with normal breast tissue. Therefore they produce localized regions of large backscatter energy levels in the beamformer image.

Nonlinear transmission lines in left-handed media

IEEE MTT-S International Microwave Symposium digest. IEEE MTT-S International Microwave Symposium

We introduce nonlinear transmission line (NLTL) based on left-handed (LH) media and simulate thir... more We introduce nonlinear transmission line (NLTL) based on left-handed (LH) media and simulate third-harmonic generation in a material that in two dimensions could also focus microwaves. We discuss physical phenomena that lead to and affect harmonic generation in LH NLTL and we outline advantages of LH NLTL media for developing a new type of frequency multiplier.

Switched-mode Microwave Ablation: Less Dependence on Tissue Properties Leads to More Consistent Ablations Than Phased Arrays

ABSTRACT