Wideband Terahertz Sensing And Spectroscopy with Electronic Sources and Detectors

2001 ◽  
pp. 301-314 ◽  
Author(s):  
D. W. Weide
Keyword(s):  
Terahertz Sensing ◽  
Electronic Sources

Nanogap-Enhanced Terahertz Sensing of 1 nm Thick (λ/106) Dielectric Films

ACS Photonics ◽  
2015 ◽  
Vol 2 (3) ◽  
pp. 417-424 ◽  
Author(s):  
Hyeong-Ryeol Park ◽  
Xiaoshu Chen ◽  
Ngoc-Cuong Nguyen ◽  
Jaime Peraire ◽  
Sang-Hyun Oh
Keyword(s):  
Dielectric Films ◽  
Terahertz Sensing

scholarly journals Passively Tunable Terahertz Filters Using Liquid Crystal Cells Coated with Metamaterials

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 381
Author(s):  
Wei-Fan Chiang ◽  
Yu-Yun Lu ◽  
Yin-Pei Chen ◽  
Xin-Yu Lin ◽  
Tsong-Shin Lim ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Ring Resonators ◽  
Maximum Frequency ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Terahertz Region ◽  
Resonance Frequencies ◽  
Terahertz Communication ◽  
Terahertz Sensing ◽  
Crystal Cells

Liquid crystal (LC) cells that are coated with metamaterials are fabricated in this work. The LC directors in the cells are aligned by rubbed polyimide layers, and make angles θ of 0°, 45°, and 90° with respect to the gaps of the split-ring resonators (SRRs) of the metamaterials. Experimental results display that the resonance frequencies of the metamaterials in these cells increase with an increase in θ, and the cells have a maximum frequency shifting region of 18 GHz. Simulated results reveal that the increase in the resonance frequencies arises from the birefringence of the LC, and the LC has a birefringence of 0.15 in the terahertz region. The resonance frequencies of the metamaterials are shifted by the rubbing directions of the polyimide layers, so the LC cells coated with the metamaterials are passively tunable terahertz filters. The passively tunable terahertz filters exhibit promising applications on terahertz communication, terahertz sensing, and terahertz imaging.

Terahertz sensing using ferroelectric nanowires

2013 ◽  
Vol 24 (4) ◽  
pp. 045501 ◽  
Author(s):  
R Herchig ◽  
Kimberly Schultz ◽  
Kevin McCash ◽  
I Ponomareva
Keyword(s):  
Terahertz Sensing

Optical strong coupling in hybrid metal-graphene metamaterial for terahertz sensing

2021 ◽  
Author(s):  
Ling Xu ◽  
Yun Shen ◽  
Liangliang Gu ◽  
Yin Li ◽  
Xiaohua Deng ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Terahertz Sensing

Utilization of Electronic Resources by Engineering College Students in Kanchipuram District, Tamil Nadu

2019 ◽  
Vol 9 (1) ◽  
pp. 75-77
Author(s):  
K. Poongodi ◽  
R. Sarangapani
Keyword(s):  
College Students ◽  
Multimedia Information ◽  
Tamil Nadu ◽  
Electronic Resources ◽  
Online Databases ◽  
Day By Day ◽  
Structured Questionnaire ◽  
Electronic Sources

Electronic sources like e-books, e-journals, online databases, multimedia information are becoming more popular day by day. The purpose of this study was to know the utilization of electronic resources by the usersof engineering colleges. A total of 200 respondents were selected in the engineering colleges of Kanchipuram district including the teaching faculties and students and 182 filled responds were received. The data was collected through a well-structured questionnaire.

scholarly journals STUDY OF THE USE OF THE THREE LEVELS OF THINKING AND REPRESENTATION

2017 ◽  
Vol 35 (1) ◽  
Author(s):  
Marina Stojanovska ◽  
Vladimir M. Petruševski ◽  
Bojan Šoptrajanov
Keyword(s):  
Educational Process ◽  
Sources Of Information ◽  
Chemistry Teaching ◽  
Republic Of Macedonia ◽  
Chemical Knowledge ◽  
The Republic ◽  
Electronic Sources

As is well-known, the chemical knowledge is acquired at three levels: the macroscopic and tangible (what can be seen, touched and/or smelt); the sub-microscopic (atoms, molecules, ions and structures) and the representational (symbols, formulae, equations, mathematical manipulation, graphs etc.). In order to acquire real knowledge, all factors involved in the educational process (authors of textbooks, teachers, electronic sources of information and students) should do everything possible to avoid formation of school-made erroneous notions (misconceptions). Reported here are the findings of a study on the presence of students’ misconceptions regarding the three levels of representation in the chemistry teaching in the Republic of Macedonia. As our study showed, many school-made misconceptions are due to the fact that students do not distinguish between the three levels of think-ing/representation.

scholarly journals Electrically Tunable Broadband Terahertz Absorption with Hybrid-Patterned Graphene Metasurfaces

Nanomaterials ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 562 ◽  
Author(s):  
Longfang Ye ◽  
Xin Chen ◽  
Guoxiong Cai ◽  
Jinfeng Zhu ◽  
Na Liu ◽  
...  
Keyword(s):  
Incident Angle ◽  
Single Layer ◽  
Normal Incidence ◽  
Transverse Magnetic ◽  
Single Layer Graphene ◽  
Terahertz Waves ◽  
Broadband Absorption ◽  
Terahertz Sensing ◽  
Axisymmetric Configuration ◽  
Broadband Terahertz

We numerically demonstrate a broadband terahertz (THz) absorber that is based on a hybrid-patterned graphene metasurface with excellent properties of polarization insensitivity, wide-angle, and active tunability. Our design is made up of a single-layer graphene with periodically arranged hybrid square/disk/loop patterns on a multilayer structure. We find that broadband absorption with 90% terahertz absorbance and the fractional bandwidth of 84.5% from 1.38 THz to 3.4 THz can be achieved. Because of the axisymmetric configuration, the absorber demonstrates absolute polarization independence for both transverse electric (TE) and transverse magnetic (TM) polarized terahertz waves under normal incidence. We also show that a bandwidth of 60% absorbance still remains 2.7 THz, ranging from 1.3 THz to 4 THz, for a wide incident angle ranging from 0° to 60°. Finally, we find that by changing the graphene Fermi energy from 0.7 eV to 0 eV, the absorbance of the absorbers can be easily tuned from more than 90% to lower than 20%. The proposed absorber may have promising applications in terahertz sensing, detecting, imaging, and cloaking.

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