Terahertz generation and detection of LT-GaAs thin film photoconductive antennas excited by lasers of different wavelengths

doi:10.1088/1674-1056/ac0cd5

Abstract A new method of generating and detecting terahertz waves is proposed. Low-temperature-grown gallium arsenide (LT-GaAs) thin films are prepared by etching a sacrificial layer (AlAs) in a four-layer epitaxial structure constituted with LT-GaAs, AlAs, GaAs, and semi-insulating gallium arsenide (SI-GaAs). The thin films are then transferred to clean silicon for fabricating the LT-GaAs thin film antennas. The quality and transmission characteristics of the films are analyzed by an 800-nm asynchronous ultrafast time domain spectroscopy system, and the degree of bonding between the film and silicon wafer is determined. Two LT-GaAs thin film antennas for generating and detecting the terahertz waves are tested with a 1550-nm femtosecond laser. The terahertz signal is successfully detected, proving the feasibility of this home-made LT-GaAs photoconductive antennas. This work lays a foundation for studying the mechanism of terahertz wave generation in GaAs photoconductive antennas below the semiconductor band gap.

Keywords: terahertz low-temperature-grown GaAs photoconductive antenna 1550-nm laser

Received: 29 April 2021
Revised: 11 June 2021
Accepted manuscript online: 21 June 2021

PACS:	87.50.U	(Millimeter/terahertz fields effects)
	73.21.Cd	(Superlattices)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61575131). The authors would like to thank Editage (www.editage.com) for English language editing.

Corresponding Authors: Bo Su
E-mail: subo75@cnu.edu.cn

Cite this article:

Xin Liu(刘欣), Qing-Hao Meng(孟庆昊), Jing Ding(丁晶), Zhi-Chen Bai(白志晨), Jia-Hui Wang(王佳慧), Cong Zhang(张聪), Bo Su(苏波), and Cun-Lin Zhang(张存林) Terahertz generation and detection of LT-GaAs thin film photoconductive antennas excited by lasers of different wavelengths 2022 Chin. Phys. B 31 028701

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Terahertz generation and detection of LT-GaAs thin film photoconductive antennas excited by lasers of different wavelengths

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