Results 81 to 90 of about 3,858 (229)

Optical characteristics of the undamaged and laser damaged K9 glass in terahertz band

Materials Research Express, 2020
K9 glass is an important optical element of the high energy laser system. In an attempt to investigate the variation of optical properties of K9 glass before and after laser induced damage, based on the transmission terahertz time-domain spectral system,
Xiaoyan Shang, Wei Shi, Wenwen Hai, Junhong Su, Chengang Dong   +4 more
doaj   +1 more source

High-pressure cell for terahertz time-domain spectroscopy

Optics Express, 2017
We introduce a sample cell that can be used for pressure-dependent terahertz time-domain spectroscopy. Compared with traditional far-IR spectroscopy with a diamond anvil cell, the larger aperture permits measurements down to much lower frequencies as low as 3.3 cm-1 (0.1 THz), giving access to new spectroscopic results.
Wei, Zhang, Daniel, Nickel, Daniel, Mittleman   +2 more
openaire   +2 more sources

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

Iterative Synthesis of Pyrene–Coronene Molecular Graphene Nanoribbons

Angewandte Chemie, EarlyView.
An iterative approach delivers a new family of undoped, cove‐edged graphene nanoribbons with lengths up to 9.1 nm that exhibit both molar absorptivity and fluorescence brightness values on the order of 105 M−1 cm−1 and an intrinsic charge‐carrier mobility of 475 ± 32 cm2 V−1 s−1.
Miguel A. Medel, Guanzhao Wen, Adrián Morón‐Blanco, Mischa Bonn, Hai I. Wang, Manuel Melle‐Franco, Aurelio Mateo‐Alonso   +6 more
wiley   +2 more sources

Engineering Large‐Grain Metal Halide Perovskite Films via Chemical Vapor Deposition for High‐Performance, Ultralow‐Noise Perovskite Photodetectors

Advanced Science, EarlyView.
Chemical vapor deposition produces large‐grain, phase‐pure CsPbBr3 films (grains up to 35 µm) with Drude‐like terahertz photoconductivity and twofold higher carrier mobility versus spin‐coated references. These microstructural advances translate into photodetectors with a detectivity of 8.4 × 1012 Jones, dark current below 1 pA cm−2, X‐ray sensitivity ...
Roel Vanden Brande, Sudipta Seth, Lei Gao, Bapi Pradhan, Dilkhush Khicher, Anastasiia Bazylevska, Wei Qu, Christian Sternemann, Hai Wang, Steven De Feyter, Weidong Xu, Fei Zhang, Mischa Bonn, Johan Hofkens, Elke Debroye   +14 more
wiley   +1 more source

Polarization-variable emitter for terahertz time-domain spectroscopy

Optics Express, 2016
We report on the progress in the development of linear polarization-variable multielectrode emitters for terahertz time-domain spectroscopy. The results on its microfabrication, the finite element method modeling of appropriate bias distribution between electrodes, the finite-difference time-domain simulated spectral output, and actual experimental ...
Bulgarevich, Dmitry S., Watanabe, Makoto, Shiwa, Mitsuharu, Niehues, Gudrun, Kitahara, Hideaki, Tani, Masahiko   +5 more
openaire   +4 more sources

Nanoscale Confinement Enhances Ultrafast Demagnetization

Advanced Science, EarlyView.
Next generation spintronics may depend on successfully combining femtosecond spin dynamics with nanoscale device miniaturization. We address this by systematically studying the effect of nanoscale confinement on the femtosecond demagnetization of Iron. By combining ultrafast experiments sensitive to spins, charge carriers, and phonons, we uncover a nm ...
Yoav William Windsor, Tobias Lojewski, Moumita Kundu, Klaus Sokolowski‐Tinten, Nico Rothenbach, Andrea Eschenlohr, Markus Ernst Gruner, Katharina Ollefs, Carolin Schmitz‐Antoniak, Soma Salamon, Daniela Zahn, Laurenz Rettig, Christian Schüßler‐Langeheine, Niko Pontius, Renkai Li, Mianzhen Mo, Suji Park, Xiaoshe Shen, Stephen Weathersby, Xijie Wang, Rossitza Pentcheva, Heiko Wende, Ulrich Nowak, Uwe Bovensiepen   +23 more
wiley   +1 more source

Dynamically Tunable Exciton‐Photon Coupling via Multi‐Physics Field in Transition Metal Dichalcogenide Microcavities

Advanced Science, EarlyView.
Dynamic microcavities provide reversible control over exciton‐photon coupling in two‐dimensional TMDs through piezoelectric, electrical, thermal, and all‐optical tuning. By reshaping detuning, Rabi splitting, and polariton composition, these strategies enable adaptable polaritonic functions, including optical switching, polariton lasing, and ...
Jingwen Zhang, Wenqi Qian, Haiyi Liu, Guangyi Tao, Hai Liu, Yifan Zhang, Pengfei Qi, Zheyu Fang   +7 more
wiley   +1 more source

Electronic Chip‐Mimetic Medical Implants for Controllable Sonothermal Treatments

Advanced Science, EarlyView.
Inspired by the thermal effect of working electronic chips, which consist of various heterostructures, an sonothermal‐responsive platform has been developed through constructing metal‐semiconductor interface on implants. Biofilm infection and deep vein thrombosis can be successfully treated by controllable ultrasound treatments.
Zhengdong Zhang, Pan Liu, Jie Lei, Shuchang Peng, Qiu Chen, Wei Guan, Yizhou Zhu, Gang Liu, Xiaobo Feng, Cao Yang, Lei Tan   +10 more
wiley   +1 more source

Terahertz Time-Domain Spectroscopy Ellipsometry [PDF]

, 2023
Ellipsometry is extensively used in the optical regime to investigate the properties of many materials as well as to evaluate with high precision the surface roughness and thickness of thin films and multilayered systems. Due to the inherent non-coherent detection technique, data analyses in optical ellipsometry tend to be complicated and require the ...
openaire   +1 more source