Broadband Terahertz Spectroscopy of Thin Films

2013 ◽  
pp. 167-184
Author(s):  
Ikufumui Katayama ◽  
Masaaki Ashida
Keyword(s):  
Thin Films ◽  
Terahertz Spectroscopy ◽  
Broadband Terahertz

scholarly journals Broadband Terahertz Spectroscopy and its Application to the Characterization of Thin Films

2010 ◽  
Vol 53 (5) ◽  
pp. 301-308 ◽  
Author(s):  
Ikufumi KATAYAMA ◽  
Masaaki ASHIDA
Keyword(s):  
Thin Films ◽  
Terahertz Spectroscopy ◽  
Broadband Terahertz

scholarly journals Optoelectronic frequency-modulated continuous-wave terahertz spectroscopy with 4 THz bandwidth

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Lars Liebermeister ◽  
Simon Nellen ◽  
Robert B. Kohlhaas ◽  
Sebastian Lauck ◽  
Milan Deumer ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Continuous Wave ◽  
Dynamic Range ◽  
Terahertz Spectroscopy ◽  
Beat Signal ◽  
Photonic Integration ◽  
Terahertz Time Domain Spectroscopy ◽  
Destructive Testing ◽  
Optical Delay ◽  
Broadband Terahertz

AbstractBroadband terahertz spectroscopy enables many promising applications in science and industry alike. However, the complexity of existing terahertz systems has as yet prevented the breakthrough of this technology. In particular, established terahertz time-domain spectroscopy (TDS) schemes rely on complex femtosecond lasers and optical delay lines. Here, we present a method for optoelectronic, frequency-modulated continuous-wave (FMCW) terahertz sensing, which is a powerful tool for broadband spectroscopy and industrial non-destructive testing. In our method, a frequency-swept optical beat signal generates the terahertz field, which is then coherently detected by photomixing, employing a time-delayed copy of the same beat signal. Consequently, the receiver current is inherently phase-modulated without additional modulator. Owing to this technique, our broadband terahertz spectrometer performs (200 Hz measurement rate, or 4 THz bandwidth and 117 dB peak dynamic range with averaging) comparably to state-of-the-art terahertz-TDS systems, yet with significantly reduced complexity. Thickness measurements of multilayer dielectric samples with layer-thicknesses down to 23 µm show its potential for real-world applications. Within only 0.2 s measurement time, an uncertainty of less than 2 % is achieved, the highest accuracy reported with continuous-wave terahertz spectroscopy. Hence, the optoelectronic FMCW approach paves the way towards broadband and compact terahertz spectrometers that combine fiber optics and photonic integration technologies.

Complex conductivity of Y1−xPrxBa2Cu3O7 thin films measured by coherent terahertz spectroscopy

1994 ◽  
Vol 235-240 ◽  
pp. 2025-2026 ◽  
Author(s):  
J.O. White ◽  
R. Buhleier ◽  
S.D. Brorson ◽  
I.E. Trofimov ◽  
H.-U. Habermeier ◽  
...  
Keyword(s):  
Thin Films ◽  
Terahertz Spectroscopy ◽  
Complex Conductivity

High-Performance Metal-Grid Polarizers on Polymeric Films for Broadband Terahertz Spectroscopy

2021 ◽  
Author(s):  
Sergei A. Kuznetsov ◽  
Alexander V. Gelfand ◽  
Alexander A. Mamrashev ◽  
Fedor A. Minakov ◽  
Nazar A. Nikolaev
Keyword(s):  
High Performance ◽  
Terahertz Spectroscopy ◽  
Polymeric Films ◽  
Metal Grid ◽  
Broadband Terahertz

Broadband terahertz spectroscopy: principles, fundamental research and potential for industrial applications

2013 ◽  
Vol 34 (6) ◽  
pp. S179-S199 ◽  
Author(s):  
W Zouaghi ◽  
M D Thomson ◽  
K Rabia ◽  
R Hahn ◽  
V Blank ◽  
...  
Keyword(s):  
Terahertz Spectroscopy ◽  
Industrial Applications ◽  
Fundamental Research ◽  
Broadband Terahertz

Broadband Terahertz Spectroscopy of Levodopa

2019 ◽  
Vol 46 (6) ◽  
pp. 0614017 ◽  
Author(s):  
朱中杰 Zhongjie Zhu ◽  
任冠华 Guanhua Ren ◽  
成超 Chao Cheng ◽  
吴志鹏 Zhipeng Wu ◽  
张建兵 Jianbing Zhang ◽  
...  
Keyword(s):  
Terahertz Spectroscopy ◽  
Broadband Terahertz

Comparative Study of Photocarrier Dynamics in CVD-deposited CuWO4, CuO, and WO3 Thin Films for Photoelectrocatalysis

2020 ◽  
Vol 234 (4) ◽  
pp. 699-717
Author(s):  
James Hirst ◽  
Sönke Müller ◽  
Daniel Peeters ◽  
Alexander Sadlo ◽  
Lukas Mai ◽  
...  
Keyword(s):  
Thin Films ◽  
Carrier Mobility ◽  
Carrier Transport ◽  
Terahertz Spectroscopy ◽  
Chemical Vapor ◽  
Photoelectrochemical Cells ◽  
Time Resolved ◽  
And Diffusion ◽  
Wo3 Thin Films ◽  
Carrier Transport Properties

AbstractThe temporal evolution of photogenerated carriers in CuWO4, CuO and WO3 thin films deposited via a direct chemical vapor deposition approach was studied using time-resolved microwave conductivity and terahertz spectroscopy to obtain the photocarrier lifetime, mobility and diffusion length. The carrier transport properties of the films prepared by varying the copper-to-tungsten stoichiometry were compared and the results related to the performance of the compositions built into respective photoelectrochemical cells. Superior carrier mobility was observed for CuWO4 under frontside illumination.

scholarly journals Correction: G. Papari et al. Terahertz Spectroscopy of Amorphous WSe2 and MoSe2 Thin Films. Materials 2018, 11, 1613

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 1017
Author(s):  
Gian Paolo Papari ◽  
Can Koral ◽  
Toby Hallam ◽  
Georg Stefan Duesberg ◽  
Antonello Andreone
Keyword(s):  
Thin Films ◽  
Terahertz Spectroscopy ◽  
Transmission Function ◽  
Exponential Factor ◽  
Correct Expression

The exponential factor in Equation (1) of the paper published in Materials [1] reports a misprint and the correct expression of the transmission function is (1) T ˜ ( ω ) = E ˜ f ( ω ) E ˜ s ( ω ) = 2 n ˜ f ( n ˜ a + n ˜ s ) ( n ˜ f + n ˜ a ) ( n ˜ f + n ˜ s ) e x p { −   i   ( n ˜ f − n ˜ a ) ω t c } F P ( ω ) where F P ( ω ) = 1 1 − ( n ˜ f − n ˜ a n ˜ f + n ˜ a ) ( n ˜ f − n ˜ s n ˜ f + n ˜ s ) e x p { − i   2   n ˜ f ω t c } [...]

Broadband terahertz spectroscopy of paper and banknotes

2020 ◽  
Vol 475 ◽  
pp. 126267 ◽  
Author(s):  
Guanhua Ren ◽  
Zhongjie Zhu ◽  
Jianbing Zhang ◽  
Hongwei Zhao ◽  
Yanfeng Li ◽  
...  
Keyword(s):  
Terahertz Spectroscopy ◽  
Broadband Terahertz
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