Proceedings, IEEE Tenth International Conference on Terahertz Electronics
Cơ quản chủ quản: N/A
Các bài báo tiêu biểu
Phát triển cấu trúc klystron phản xạ sóng siêu nhỏ Dịch bởi AI
Bài báo mô tả quá trình phát triển cấu trúc klystron phản xạ sóng siêu nhỏ được vi gia công. Một phân tích tổng quan về những vấn đề lý thuyết chính, chẳng hạn như dao động và điều kiện khởi động, cũng như cách mà công suất đầu ra tỷ lệ với tần số. Hai kỹ thuật để hiện thực hóa lắp ráp khoang cộng hưởng được nêu ra. Phương pháp được ưa chuộng dẫn đến khoang tái nhập bằng vàng có thể đứng riêng biệ......
#Klystrons #Radio frequency #Electrons #Micromachining #Optical modulation #Resonance #Assembly #Gold #Astronomy #Low voltage
Multi-channel signal recording with photoconductive antennas for THz imaging
We have constructed a small and cheap, yet efficient electronic circuit for reading out THz signals from photoconductive antennas. An 8-channel version of this circuit has been used for THz imaging by simultaneously recording sets of 8 time-domain THz waveforms with an array of 8 photoconductive antennas.
#Photoconductivity #Pulse amplifiers #Photoconducting devices #Laser excitation #Circuits #Charge coupled devices #Charge-coupled image sensors #Optical pulse generation #Time domain analysis #Antenna arrays
Intra- and extra-cavity THz generation from optically and electrically confined photoconducting layers [GaAs]
A photoconductive terahertz generator with an integrated Bragg mirror is presented. The generator exhibits significantly improved performance. We demonstrate for the first time intra-cavity THz generation using this type of photoconductive emitter.
#Photoconductivity #Gallium arsenide #Mirrors #Substrates #Optical pulse generation #Ultrafast optics #Power generation #Integrated optics #Optical modulation #Molecular beam epitaxial growth
Achromatically injection-seeded terahertz-wave parametric generator
An achromatically injection-seeded terahertz-wave parametric generator (ais-TPG) was constructed using MgO:LiNbO/sub 3/ crystals and a tunable seeder using a stationary dispersion-compensated optical arrangement. Without readjusting the mirrors, smooth tuning of the terahertz-wave over the 0.6/spl sim/2.6 THz range was obtained by adjusting the seeder wavelength alone. The feasibility of this syst......
#Optical frequency conversion #Gratings #Tunable circuits and devices #Laser tuning #Optical resonators #Frequency conversion #Telescopes #Lenses #Nonlinear optics #Optical pumping
Diagonal and vertical far-infrared transitions from quantum cascade emitters
We report a study of a far-infrared GaAs-Al/sub 0.15/Ga/sub 0.85/As quantum cascade electro-luminescence device designed to emit via both diagonal and vertical transitions. Each type of transition was preferentially chosen by varying the applied electric field. The different transitions were identified by correlation with bandstructure calculations, electrical characteristics and the width of the ......
#Quantum cascade lasers #Phonons #Optical scattering #Electric variables #Contact resistance #Electroluminescent devices #Temperature #Stimulated emission #Particle scattering #Helium
Terahertz generation in negative-effective-mass diodes
Theoretically studied current self-oscillations and spatiotemporal current patterns in quantum-well (QW) negative-effective-mass (NEM) p/sup +/pp/sup +/ diodes when the electric field is applied along the direction of the well. The origin of current self-oscillations is the formation and traveling of electric-field domains in the well. In the calculations we have accurately considered scattering c......
#Semiconductor diodes #Phonons #Dispersion #Optical scattering #Spatiotemporal phenomena #Doping #Light scattering #Effective mass #Equations #Steady-state
Design and performance of a novel vacuum-capable terahertz time-domain spectrometer
We have designed and built a vacuum-capable terahertz (THz) time-domain spectrometer which allows THz spectroscopy measurements to be made whilst avoiding interference from, for example, water vapour absorption. Using a biased semi-insulating GaAs emitter and a 1-mm-thick [110] oriented ZnTe crystal as an electro-optic detection sensor, we achieved a dynamic range of over 10/sup 10/ in THz power a......
#Time domain analysis #Spectroscopy #Absorption #Zinc compounds #Submillimeter wave measurements #Interference #Gallium arsenide #Electrooptic devices #Dynamic range #Frequency
Polarization response of two-dimensional metallic photonic crystals studied by terahertz time domain spectroscopy
The polarization characteristics of the THz wave transmitted through the two-dimensional metallic photonic crystal (2D-MPC) are investigated. The 2D-MPC, we used here, is a thin conductive screen perforated periodically with circular holes. We measured the polarization characteristics of the THz wave using THz time-domain spectroscopy with wire-gird polarizers. In this system, we can detect the te......
#Photonic crystals #Optical filters #Photonic band gap #Spectroscopy #Lattices #Optical polarization #Electron optics #Optical sensors #Crystalline materials #Optical materials
Terahertz quantum cascade lasers
The terahertz region (1-10 THz) of the electromagnetic spectrum offers ample opportunities in spectroscopy, free space communications, remote sensing and medical imaging. Yet, the use of THz waves in all these fields has been limited by the absence of appropriate sources. Existing solid-state emitters, in fact, lack the general requisites of compactness, integrability and portability necessary for......
#Quantum cascade lasers #Laser transitions #Power generation #Semiconductor lasers #Laser modes #Laser theory #Electromagnetic spectrum #Spectroscopy #Remote sensing #Biomedical imaging
Terahertz pulse emission from strained GaN/GaInN quantum well structures
Efficient THz pulse generation from optically pumped InGaN/GaN multiple quantum well structures is demonstrated. Such structures incorporate strong electric fields of opposite directions - piezoelectric fields inside the quantum wells and in the barrier. Polarized states inside the quantum well and in the barrier give different contributions to the THz pulse, depending on whether the excitation is......
#Gallium nitride #Optical pulse generation #Ultrafast optics #Optical pumping #Optical polarization #Nonlinear optics #Stimulated emission #Spectroscopy #Optical pulses #Quantum well devices