Cavity modes in broadly tunable superconducting coherent terahertz sources

Kaveh Delfanazari, Richard A. Klemm, Manabu Tsujimoto, Daniel P. Cerkoney, Takashi Yamamoto, Takanari Kashiwagi, Kazuo Kadowaki

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

We discuss the cavity modes and radiation pattern in solid state terahertz (THz) sources based on layered high-temperature superconducting Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212). We experimentally measure the emission spectra using the Fourier transform infrared spectrometer in order to elucidate the radiation mechanism of the mesa samples. Moreover, we experimentally study the angular dependence of the emission intensity obtained in one mesa's plane at the frequency f = 0.61 THz, at various detection angles θ by rotating the sample holder relative to the detector, to identify the excited EM cavity modes within the mesa that participate in the device output power enhancement. We modelled the mesa cavity and find a relatively good agreement between the experiment and theory. Our results show that compact, coherent and continuous-wave Bi-2212 THz devices are one of the most promising THz sources, capable of bridging the microwaves to photonics gap.

Original languageEnglish
Article number012011
Number of pages7
JournalJournal of Physics: Conference Series
Volume1182
Issue number1
DOIs
Publication statusPublished - 2019
Event13th Workshop on Low Temperature Electronics, WOLTE 2018 - Sorrento, Italy
Duration: 10 Sep 201813 Sep 2018

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