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This paper presents a global framework analysis of a microstrip antenna design circularly polarized with an operating frequency of 5.80 GHz and a bandwidth of at least 500 MHz. We evaluate the optimal antenna parameters to design…

信号处理 · 电气工程与系统科学 2019-01-17 Elyes Balti , Brian K. Johnson

We have measured the penetration depth $\lambda(T)$ on $\rm YBa_{2}Cu_{3}O_{7}$ thin films from transmission at 120, 330 and 510~GHz, between 5 and 50~K. Our data yield simultaneously the absolute value and the temperature dependence of…

凝聚态物理 · 物理学 2009-10-28 L. A. de Vaulchier , J. P. Vieren , Y. Guldner , N. Bontemps , R. Combescot , Y. Lemaitre , J. C. Mage

We measure the transmission of THz pulses through thin films of YBCO at temperatures between 10K and 300K. The pulses possess a useable bandwidth extending from 0.1 -- 1.5 THz (3.3 cm^-1 -- 50 cm^-1). Below T_c we observe pulse reshaping…

凝聚态物理 · 物理学 2009-10-22 S. D. Brorson , R. Buhleier , J. O. White , I. E. Trofimov , H. -U. Habermeier , J. Kuhl

We present results of detailed study on the electron dispersions and Fermi surface of lead telluride doped with $2\%$ of thallium, which is resonant impurity in PbTe. Using the KKR--CPA method, Bloch spectral functions (BSFs), which replace…

材料科学 · 物理学 2013-11-15 Bartlomiej Wiendlocha

Detecting out-of-distribution (OOD) examples is critical in many applications. We propose an unsupervised method to detect OOD samples using a $k$-NN density estimate with respect to a classification model's intermediate activations on…

机器学习 · 计算机科学 2021-02-11 Dara Bahri , Heinrich Jiang , Yi Tay , Donald Metzler

Thermal diffuse scattering (TDS) caused by the interaction of high-energy electrons with phonons has been investigated. An oscillating atom retains all of its elastic scattering capacity, although the vibration changes the spatial…

材料科学 · 物理学 2023-01-24 Yuan Yao

A rail-mounted synthetic aperture radar has been constructed to operate at W-band (75 - 110 GHz) and a THz band (325 - 500 GHz) in order to ascertain its ability to locate isolated small, visually obscured metallic scatterers embedded in…

仪器与探测器 · 物理学 2017-01-11 Jonathan T. Richard , Henry O. Everitt

The physical properties of two-dimensional (2D) materials may drastically vary with their thickness profiles. Current thickness profiling methods for 2D material (e.g., atomic force microscopy and ellipsometry) are limited in measurement…

光学 · 物理学 2022-07-12 Yujie Nie , Nansen Zhou , Li Tao , Jinlong Zhu , Zhaoli Gao , Jianbin Xu , Renjie Zhou

An easy to implement and powerful method for the solution of 3D scattering problems that can be well described by Helmholtz equation is presented. The matrix algebra used provides excellent stability versus the number of junctions as well…

介观与纳米尺度物理 · 物理学 2007-05-23 J. A. Torres , J. J. Saenz

We study broadband terahertz (THz) conductivity and ultrafast photoconductivity spectra in lithographically fabricated multilayer epitaxial graphene nanoribbons grown on C- face of 6H-SiC substrate. THz near-field spectroscopy reveals local…

材料科学 · 物理学 2026-03-02 Arvind Singh , Jan Kunc , Tinkara Troha , Hynek Němec , Petr Kužel

In this study we present spatially resolved texture and orientation maps from a cube-shaped sample of Ti-6Al-4V alloy, reconstructed by means of texture tomography (TT). Unlike grain resolved 3DXRD techniques which require "spotty"…

Using mm-wave transmission we obtain information about both the real and imaginary part of the dielectric function of superconducting thin films. This is done by fitting the Fabry-Perot resonance spectrum for the film plus substrate over a…

超导电性 · 物理学 2009-10-30 B. J. Feenstra , F. C. Klaassen , D. van der Marel , Z. H. Barber , R. Perez Pinaya , M. Decroux

The most direct definition of a patterning process' resolution is the smallest half-pitch feature it is capable of transferring onto the substrate. Here we demonstrate that thermal Scanning Probe Lithography (t-SPL) is capable of…

Ground-based astronomy suffers from strong atmospheric line- and thermal continuum emission, at the near infrared (NIR, 0.7-1.1$\mu$m), and short-wave infrared (SWIR, 1.1-2.5$\mu$m) wavelengths. The thermal continuum emission increases…

天体物理仪器与方法 · 物理学 2026-01-06 J. K. M. Viuho , A. A. Djupvik , A. N. Sørensen , D. Kumar , P. Steiner , J. P. U. Fynbo , S. Armas , M. I. Andersen

Thermal Kinetic Inductance Detectors (TKIDs) combine the excellent noise performance of traditional bolometers with a radio frequency multiplexing architecture that enables the large detector counts needed for the next generation of…

We demonstrate strong negative electrothermal feedback accelerating and linearizing the response of a thermal kinetic inductance detector (TKID). TKIDs are a proposed highly multiplexable replacement to transition-edge sensors and measure…

We introduce a novel reflection-mode diffraction tomography technique that enables simultaneous recovery of forward and backward scattering information for high-resolution 3D refractive index reconstruction. Our technique works by imaging a…

光学 · 物理学 2025-02-12 Tongyu Li , Jiabei Zhu , Yi Shen , Lei Tian

Atomic-resolution scanning transmission electron microscopy (STEM) characterization requires precise tilting of the specimen to high symmetric zone axis, which is usually processed in reciprocal space by following the diffraction patterns.…

材料科学 · 物理学 2024-06-04 Jiake Wei , Zhangze Xu , Wenjie Shen , Bin Feng , Ryo Ishikawa , Naoya Shibata , Yuichi Ikuhara , Xuedong Bai

The terahertz (THz) band (0.1-10 THz) is widely considered to be a candidate band for the sixth-generation mobile communication technology (6G). However, due to its short wavelength (less than 1 mm), scattering becomes a particularly…

信号处理 · 电气工程与系统科学 2023-05-08 Ben Chen , Ke Guan , Danping He , Pengxiang Xie , Zhangdui Zhong , Jianwu Dou , Shahid Mumtaz , Wael Bazzi

We have developed Lumped Element Kinetic Inductance Detectors (LEKID) sensitive in the frequency band from 80 to 120~GHz. In this work, we take advantage of the so-called proximity effect to reduce the superconducting gap of Aluminium,…