Details

Autor(en) / Beteiligte

• Liu, Xin
• Meng, Qing-Hao
• Ding, Jing
• Bai, Zhi-Chen
• Wang, Jia-Hui
• Zhang, Cong
• Su, Bo
• Zhang, Cun-Lin

Titel

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

Ist Teil von

• Chinese physics B, 2022-02, Vol.31 (2), p.28701-768

Ort / Verlag

Chinese Physical Society and IOP Publishing Ltd

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.