Daniel Van Der Weide | University of Wisconsin-Madison (original) (raw)

Uploads

Papers by Daniel Van Der Weide

Research paper thumbnail of Si/SiGe Quantum Devices, Quantum Wells, and Electron-Spin Coherence

Topics in Applied Physics, 2009

Research paper thumbnail of Electronic Terahertz Spectroscopic Imaging of Explosives and Weapons

Research paper thumbnail of Single-Receptor Interfaces for Real-Time Kinetics

Research paper thumbnail of Microfabrication and application of high-aspect-ratio silicon tips

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

Research paper thumbnail of Coherent Fourier-Transform Spectroscopy Based on Infrared Frequency Combs

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

ABSTRACT

Research paper thumbnail of 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 ...

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

Research paper thumbnail of 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. ...

Research paper thumbnail of 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.

Research paper thumbnail of Frequency-comb infrared spectrometer for rapid, remote chemical sensing

Research paper thumbnail of Localized picosecond resolution with a near-field microwave/scanning-force microscope

Applied Physics Letters, 1997

Research paper thumbnail of Harmonic frequency comb mid-infrared Fourier-transform spectroscopy without moving part

Research paper thumbnail of Rapid, remote sensing with a coherent-comb infrared spectrometer

Research paper thumbnail of 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.

Research paper thumbnail of Controllable wireless power delivery for biomedical implants

2014 IEEE Healthcare Innovation Conference (HIC), 2014

Research paper thumbnail of 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.

Research paper thumbnail of 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.

Research paper thumbnail of Experimental investigation of microwave imaging via space-time beamforming for breast cancer detection

Research paper thumbnail of 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.

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

Research paper thumbnail of Si/SiGe Quantum Devices, Quantum Wells, and Electron-Spin Coherence

Topics in Applied Physics, 2009

Research paper thumbnail of Electronic Terahertz Spectroscopic Imaging of Explosives and Weapons

Research paper thumbnail of Single-Receptor Interfaces for Real-Time Kinetics

Research paper thumbnail of Microfabrication and application of high-aspect-ratio silicon tips

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

Research paper thumbnail of Coherent Fourier-Transform Spectroscopy Based on Infrared Frequency Combs

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

ABSTRACT

Research paper thumbnail of 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 ...

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

Research paper thumbnail of 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. ...

Research paper thumbnail of 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.

Research paper thumbnail of Frequency-comb infrared spectrometer for rapid, remote chemical sensing

Research paper thumbnail of Localized picosecond resolution with a near-field microwave/scanning-force microscope

Applied Physics Letters, 1997

Research paper thumbnail of Harmonic frequency comb mid-infrared Fourier-transform spectroscopy without moving part

Research paper thumbnail of Rapid, remote sensing with a coherent-comb infrared spectrometer

Research paper thumbnail of 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.

Research paper thumbnail of Controllable wireless power delivery for biomedical implants

2014 IEEE Healthcare Innovation Conference (HIC), 2014

Research paper thumbnail of 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.

Research paper thumbnail of 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.

Research paper thumbnail of Experimental investigation of microwave imaging via space-time beamforming for breast cancer detection

Research paper thumbnail of 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.

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