Fast room temperature detection of state of circular polarization of terahertz radiation

被引：3
|
作者：
Ganichev, SD [1 ]
Ketterl, H [1 ]
Prettl, W [1 ]
机构：
[1] Univ Regensburg, Inst Expt & Angew Phys, D-93040 Regensburg, Germany
来源：
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES | 2003年 / 24卷 / 06期
关键词：
circular photogalvanic effect; fast infrared detection; helicity of radiation;
D O I：
10.1023/A:1023707006767
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We report on a room temperature detector which allows to determine and monitor the state of polarization of terahertz radiation with picosecond temporal resolution. The detector is based on the circular photogalvanic effect recently observed in GaAs/AlGaAs quantum wells. The circular photogalvanic effect yields in response to elliptically polarized radiation a current signal proportional to the degree of circular polarization. The peak current signal occurs in unbiased samples for circular polarization, vanishes at linear polarization and changes sign by switching the helicity from right-handed to left-handed. The detector consists of a (113)A MBE grown p-GaAs/AlGaAs multiple quantum well structure. The response has been measured in the wavelength range between 76 mum and 280 mum at normal incidence of the radiation on the sample.
引用
收藏
页码：847 / 853
页数：7
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