Detection of up to 60 THz with an LT-GaAs photoconductive antenna

Author

Kono, S. ; Tani, M. ; Sakai, K.

Author_Institution

Commun. Res. Lab., Kansai Adv. Res. Center, Kobe, Japan

fYear

2001

fDate

11-11 May 2001

Firstpage

102

Lastpage

103

Abstract

Summary form only given. The photoconductive (PC) antenna gated with ultrashort optical pulses played an important role to initiate the recent development of the terahertz (THz) opto-electronics. Owing to its high efficiency and good signal-to-noise ratio (SNR), the PC antenna has been used for the generation and detection of the coherent THz electromagnetic transients. However, the bandwidth of the PC antenna has been considered to be limited due to the finite carrier lifetime of antenna substrate semiconductors. The reported bandwidth of the PC antenna has been attained up to 7 THz. Therefore, recent interest in the broadband coherent detection higher than 10 THz has shifted to the electro-optic (EO) sampling technique. We report on the further expansion of the detectable bandwidth of the PC antenna. A broadband radiation was generated by using EO crystals as the emitter, and was detected with the PC antenna gated with 15-fs laser. The detected frequency extended to 60 THz. This is the highest frequency detected with a PC antenna so far reported.

Keywords

III-V semiconductors; antennas; electro-optical devices; gallium arsenide; infrared detectors; optical pulse generation; photoconducting devices; photodetectors; 15 fs; 60 THz; GaAs; LT-GaAs photoconductive antenna; THz opto-electronics; antenna substrate semiconductors; broadband coherent detection; broadband radiation; coherent THz electromagnetic transients; detectable bandwidth; detected frequency; efficiency; electro-optic sampling technique; finite carrier lifetime; photoconductive antenna; signal-to-noise ratio; terahertz opto-electronics; ultrashort optical pulses; Bandwidth; Broadband antennas; Charge carrier lifetime; Frequency; Optical pulses; Photoconductivity; Sampling methods; Signal generators; Signal to noise ratio; Substrates;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics, 2001. CLEO '01. Technical Digest. Summaries of papers presented at the Conference on

Conference_Location

Baltimore, MD, USA

Print_ISBN

1-55752-662-1

Type

conf

DOI

10.1109/CLEO.2001.947538

Filename

947538