Results 41 to 50 of about 219,971 (340)
Coherent THz Hyper-Raman: Spectroscopy and Application in THz Detection [PDF]
Materials, 2019 Recently we have demonstrated a new nonlinear optical effect in the THz interval of frequencies. The latter is based on the use of femtosecond optical pulses and intense, sub-ps, broadband terahertz (THz) pulses to generate a THz-optical four- and five-wave mixing in the investigated material.
Ceraso A, Mou S, Rubano A, Paparo D
openaire +4 more sources
Asymmetric all Silicon Micro-Antenna Array for High Angle Beam Bending in Terahertz Band
IEEE Photonics Journal, 2019 Phase mapping of metasurfaces with a finite number of elements is popular in wavefront manipulation. However, in high angle beam bending, the efficiency of bending beams drastically drops, which will greatly limit the applications of metasurface in ...
Zihao Liu +3 more
doaj +1 more source
Optical frequency combs from high-order sideband generation [PDF]
, 2018 We report on the generation of frequency combs from the recently-discovered phenomenon of high-order sideband generation (HSG). A near-band gap continuous-wave (cw) laser with frequency $f_\text{NIR}$ was transmitted through an epitaxial layer containing
Banks, Hunter B +6 more
core +3 more sources
Self-phase modulation of a single-cycle terahertz pulse by nonlinear free-carrier response in a semiconductor [PDF]
, 2012 We demonstrate the self-phase modulation (SPM) of a single-cycle THz pulse in a semiconductor, using bulk n-GaAs as a model system. The SPM arises from the heating of free electrons in the electric field of the THz pulse, leading to an ultrafast ...
Hoffmann, Matthias C. +2 more
core +2 more sources
Real-time terahertz imaging with a single-pixel detector [PDF]
, 2020 Terahertz (THz) radiation is poised to have an essential role in many imaging applications, from industrial inspections to medical diagnosis. However, commercialization is prevented by impractical and expensive THz instrumentation.
Blu, Thierry +3 more
core +1 more source
Double Fano Resonances in S-Shaped Plasmonic Metasurfaces in Terahertz Region
Frontiers in Physics, 2020 We numerically and experimentally demonstrated double Fano resonances in a simple S-shaped plasmonic metasurface in the terahertz frequency range. Apart from the electric-LC resonance and electric dipole (ED) resonance, two trapped modes are excited in ...
Weihang Xu +5 more
doaj +1 more source
Spectral self-action of THz emission from ionizing two-color laser pulses in gases [PDF]
, 2014 The spectrum of terahertz (THz) emission in gases via ionizing two-color femtosecond pulses is analyzed by means of a semi-analytic model and finite-difference-time-domain simulations in 1D and 2D geometries.
Babushkin, Ihar +4 more
core +7 more sources
Proceedings 2000 International Conference on Image Processing (Cat. No.00CH37101), 2002 A real-time imaging system based on terahertz (THz) time-domain spectroscopy has been demonstrated. This technique offers a range of unique imaging modalities due to the broad bandwidth, sub-picosecond duration, and phase-sensitive detection of the THz pulses. This paper provides an introduction of the state-of-the art in THz imaging.
Timothy Dorney +3 more
openaire +1 more source
A traveling-wave THz photomixer based on angle-tuned phase matching [PDF]
, 1999 A traveling-wave THz photomixer based on a free-space optical-THz phase-matching scheme is proposed. A dc-biased coplanar strip line fabricated on low-temperature-grown GaAs serves as the active area of the device, and is illuminated by two noncollinear ...
Blake, Geoffrey A. +6 more
core +1 more source
Analysis of Non-Idealities in the Generation of Reconfigurable Sinc-Shaped Optical Nyquist Pulses
IEEE Access, 2021 Optical sinc-shaped Nyquist pulses are widely used in microwave photonics, optical signal processing, and optical telecommunications due to their numerous advantages, like rectangular shape in the frequency domain, the orthogonality and the consequential
Souvaraj De +4 more
doaj +1 more source