Results 121 to 130 of about 81,306 (310)

Molecular spectroscopy with a multimode THz quantum-cascade laser [PDF]

, 2011
A terahertz absorption spectrometer for highresolution molecular spectroscopy is realized. The spectrometer is based on a multimode quantum-cascade laser. The design and performance of the spectrometer are presented.
A. D. Semenov, H.-W. Hubers, H. Richter, Eichholz, Rene, M. Giehler, Schrottke, L., Pavlov, Sergey, S. G. Pavlov, Wienold, M., Semenov, A. D., Richter, Heiko, Grahn, H. T., Giehler, M., Hübers, Heinz-Wilhelm, R. Eichholz, Hey, R., M. Wienold, L. Schrottke, H. T. Grahn, R. Hey   +19 more
core   +1 more source

Efficient Polarization‐Entangled Photon‐Pair Generation by a Fiber‐In‐Line van der Waals Material

Advanced Science, EarlyView.
Telecom‐wavelength polarization‐entangled photon pairs are generated in a van der Waals‐material‐integrated all‐fiber device via spontaneous parametric down‐conversion. The demonstrated fiberized quantum light source bridges emerging 2D nonlinear materials and practical quantum photonic systems, opening new opportunities for scalable fiber‐based ...
Jungseok Choi, Seongju Ha, Seungjae Lim, Joohyeon Ahn, Jaekyoung Kim, Jong Hyuk Yim, Nam Hun Park, Youngdong Yoo, Jae‐Ung Lee, Hee Su Park, Sang Min Lee, Dong‐Il Yeom   +11 more
wiley   +1 more source

Transfer learning enabled transformer-based generative adversarial networks for modeling and generating terahertz channels

Communications Engineering
Terahertz communications are envisioned as a promising technology for the sixth generation and beyond wireless systems, which can support wireless links with Terabits-per-second (Tbps) data rates.
Zhengdong Hu, Yuanbo Li, Chong Han
doaj   +1 more source

Pattern‐Aware Intelligence Enables Nondestructive, Rapid Quantification of High‐Aspect‐Ratio Silicon Etching

Advanced Science, EarlyView.
Pattern‐dependent etching is converted into a physical prior for intelligent reconstruction of high‐aspect‐ratio silicon structures. Combining YOLO‐Pose feature extraction with a topography network, the framework retrieves depth, sidewall angle, and scallop texture from minimal destructive observations, enabling accurate cross‐scale metrology and near ...
Shuyan He, Lang Chen, Bo Wen, Yufeng Jin, Wei Wang   +4 more
wiley   +1 more source

Terahertz spectrum analyzer based on a terahertz frequency comb

Optics Express, 2008
Precision frequency measurements of terahertz (THz) waves are required to establish metrology in the THz spectral region. However, frequency measurement techniques in this region are immature. We propose a THz spectrum analyzer to measure the absolute frequency and spectral shape of continuous-wave THz waves.
Shuko, Yokoyama, Ryotaro, Nakamura, Masaki, Nose, Tsutomu, Araki, Takeshi, Yasui   +4 more
openaire   +2 more sources

Second-order bandpass frequency selective surface for terahertz applications

, 2014
In this paper, a two-layered frequency selective surface with miniaturized elements is proposed for millimeter wave and terahertz applications. The advantages of this design are a harmonic free transmission response and low sensitivity of its frequency ...
Abbott, D., Derek Abbott, Al-Sarawi, S., Withawat Withayachumnankul, Said Al-Sarawi, Amir Ebrahimi, Ebrahimi, A., Withayachumnankul, W.   +7 more
core   +1 more source

High-Frequency Modulation Spectroscopy with a THz Quantum-Cascade Laser [PDF]

, 2013
A terahertz absorption spectrometer with a quantum-cascade laser (QCL) for high-resolution molecular spectroscopy is realized. The spectrometer is based on highfrequency (up to 50 MHz) modulation of the QCL frequency.
H.-W. Hubers, H. Richter, Richter, Heiko, Schrottke, Lutz, Grahn, H. T., Eichholz, Rene, Hübers, Heinz-Wilhelm, Wienold, Martin, R. Eichholz, M. Wienold, L. Schrottke, H. T. Grahn   +11 more
core   +1 more source

Integrated Luneburg and Maxwell Fisheye Lenses for the Terahertz Range

, 2019
Micro-scale silicon photonic crystal waveguides show promise to realize efficient terahertz photonic circuits. Monolithically-integrated gradient-index optics expand the functionality of terahertz photonic crystal waveguide-based systems.
Fujita, M., Tadao Nagatsuma, Nagatsuma, T., Withawat Withayachumnankul, Daniel Headland, Masayuki Fujita, Headland, D., Withayachumnankul, W.   +7 more
core   +1 more source

Unveiling the Ultralow Thermal Conductivity of Hybrid Perovskites

Advanced Science, EarlyView.
In hybrid perovskites, thermal energy flows through lattice vibrations of the framework (48%–65%) and organic molecules (35%–52%). When the disorder introduced by organic molecules is excluded, the temperature dependence of the vibrational thermal conductivity results from the lattice framework transits from ∼T0 to ∼T−1, and the value doubles at room ...
Qinqin He, Yuli Chen, Zhigang Li, Yanguang Zhou   +3 more
wiley   +1 more source

Sum-Frequency Signals in 2D-Terahertz-Terahertz-Raman Spectroscopy

, 2020
We demonstrate that halogenated methane 2D-Terahertz Terahertz Raman (2D-TTR) spectra are determined by the complicated structure of the instrument response function (IRF) along $f_1$ and by the molecular coherences along $f_2$. Experimental improvements
Griffin Mead (1760926), Haw-Wei Lin (4216642), Thomas F. Miller (1292676), Geoffrey A. Blake (3050934), Ioan-Bogdan Magdău (17517018)   +4 more
core   +1 more source