An optically controllable terahertz filter

被引：142

作者：

Libon, IH

Baumgärtner, S

Hempel, M

Hecker, NE ^{[1
]}

Feldmann, J

Koch, M

Dawson, P

机构：

[1] Univ Munich, Dept Phys, Photon & Optoelect Grp, D-80799 Munich, Germany

[2] Univ Munich, CENS, D-80799 Munich, Germany

[3] Tech Univ Braunschweig, Inst Hochfrequenztech, D-38106 Braunschweig, Germany

[4] UMIST, Dept Phys, Manchester M60 1QD, Lancs, England

来源：

APPLIED PHYSICS LETTERS | 2000年 / 76卷 / 20期

关键词：

D O I：

10.1063/1.126484

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Using a mixed type-I/type-II GaAs/AlAs multiple-quantum-well sample, we have demonstrated an optically controllable and tunable terahertz (THz) filter. Long-lived electron-hole pairs in the quantum wells allow for efficient THz attenuation over a large THz spot size (2 mm) for extremely low optical cw power. This sample can also be used as an optically tunable THz phase shifter. The optically induced change of the GaAs quantum wells from a dielectric to a conducting material leads to the observed attenuation and the shifting of the THz wave forms. (C) 2000 American Institute of Physics. [S0003-6951(00)02920-X].

引用

页码：2821 / 2823

页数：3

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