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https://hdl.handle.net/20.500.14094/90005880
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2024-05-22
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90005880 (fulltext)
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90005880
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open access
出版タイプ
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タイトル
Broadband THz absorption spectrometer based on excitonic nonlinear optical effects
著者
Majeed, Avan ; Ivanov, Pavlo ; Stevens, Benjamin ; Clarke, Edmund ; Butler, Iain ; Childs, David ; Kojima, Osamu ; Hogg, Richard
著者名
Majeed, Avan
著者名
Ivanov, Pavlo
著者名
Stevens, Benjamin
著者名
Clarke, Edmund
著者名
Butler, Iain
著者名
Childs, David
著者ID
A0956
研究者ID
1000000415845
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=174deb414e2dd3a0520e17560c007669
著者名
Kojima, Osamu
小島, 磨
コジマ, オサム
所属機関名
工学研究科
著者名
Hogg, Richard
収録物名
Light: science & Applications
巻(号)
8
ページ
29-29
出版者
Nature Research
刊行日
2019-03-13
公開日
2019-04-23
抄録
A broadly tunable THz source is realized via difference frequency generation, in which an enhancement to χ(3) that is obtained via resonant excitation of III-V semiconductor quantum well excitons is utilized. The symmetry of the quantum wells (QWs) is broken by utilizing the built-in electric-field across a p-i-n junction to produce effective χ(2) processes, which are derived from the high χ(3). This χ(2) media exhibits an onset of nonlinear processes at ~4 W cm(-2), thereby enabling area (and, hence, power) scaling of the THz emitter. Phase matching is realized laterally through normal incidence excitation. Using two collimated 130 mW continuous wave (CW) semiconductor lasers with ~1-mm beam diameters, we realize monochromatic THz emission that is tunable from 0.75 to 3 THz and demonstrate the possibility that this may span 0.2-6 THz with linewidths of ~20 GHz and efficiencies of ~1 x 10(-5), thereby realizing ~800 nW of THz power. Then, transmission spectroscopy of atmospheric features is demonstrated, thereby opening the way for compact, low-cost, swept-wavelength THz spectroscopy.
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工学研究科
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© The Author(s) 2019.
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
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journal article
言語
English (英語)
eISSN
2047-7538
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DOI
https://doi.org/10.1038/s41377-019-0137-y
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