Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review

Lin CHEN; Deng-gao LIAO; Xu-guang GUO; Jia-yu ZHAO; Yi-ming ZHU; Song-lin ZHUANG

doi:10.1631/FITEE.1800633

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Front. Inform. Technol. Electron. Eng ›› 2019, Vol. 20 ›› Issue (5) : 591-607. DOI: 10.1631/FITEE.1800633

Review

Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review

Lin CHEN¹^,²^,³ ,
Deng-gao LIAO¹ ,
Xu-guang GUO¹^,² ,
Jia-yu ZHAO¹^,² ,
Yi-ming ZHU¹^,²^,³ ,
Song-lin ZHUANG¹^,²

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Abstract

We give a brief review of the developments in terahertz time-domain spectroscopy (THz-TDS) systems and microcavity components for probing samples in the University of Shanghai for Science and Technology. The broadband terahertz (THz) radiation sources based on GaAs m-i-n diodes have been investigated by applying high electric fields. Then, the free space THz-TDS and fiber-coupled THz-TDS systems produced in our lab and their applications in drug/cancer detection are introduced in detail. To further improve the signal-to-noise ratio (SNR) and enhance sensitivity, we introduce three general micro-cavity approaches to achieve tiny-volume sample detection, summarizing our previous results about their characteristics, performance, and potential applications.

Keywords

Terahertz (THz) time-domain spectroscopy / Micro-cavity / Metal holes array / Waveguide cavities / Spoof localized surface plasmons (LSPs)

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Lin CHEN, Deng-gao LIAO, Xu-guang GUO, Jia-yu ZHAO, Yi-ming ZHU, Song-lin ZHUANG. Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review. Front. Inform. Technol. Electron. Eng, 2019, 20(5): 591‒607 https://doi.org/10.1631/FITEE.1800633