Frequency-domain terahertz spectroscopy using long-carrier-lifetime photoconductive antennas

Lu, Ping-Keng; Jarrahi, Mona

doi:10.1364/OE.483746

Frequency-domain terahertz spectroscopy using long-carrier-lifetime photoconductive antennas

Journal Article · Mon Feb 27 00:00:00 EST 2023 · Optics Express

DOI:https://doi.org/10.1364/OE.483746· OSTI ID:1958928

Lu, Ping-Keng;

We present a telecommunication-compatible frequency-domain terahertz spectroscopy system realized by novel photoconductive antennas without using short-carrier-lifetime photoconductors. Built on a high-mobility InGaAs photoactive layer, these photoconductive antennas are designed with plasmonics-enhanced contact electrodes to achieve highly confined optical generation near the metal/semiconductor surface, which offers ultrafast photocarrier transport and, hence, efficient continuous-wave terahertz operation including both generation and detection. Consequently, using two plasmonic photoconductive antennas as a terahertz source and a terahertz detector, we successfully demonstrate frequency-domain spectroscopy with a dynamic range more than 95 dB and an operation bandwidth of 2.5 THz. Moreover, this novel approach to terahertz antenna design opens up a wide range of new possibilities for many different semiconductors and optical excitation wavelengths to be utilized, therefore bypassing short-carrier-lifetime photoconductors with limited availability.

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Research Organization:: University of California, Los Angeles, CA (United States)

Sponsoring Organization:: Office of Naval Research (ONR); USDOE

Grant/Contract Number:: SC0016925

OSTI ID:: 1958928

Alternate ID(s):: OSTI ID: 2001450

Journal Information:: Optics Express, Journal Name: Optics Express Journal Issue: 6 Vol. 31; ISSN 1094-4087; ISSN OPEXFF

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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