Microlens coupled interdigital photoconductive switch

被引：47

作者：

Matthaeus, Gabor ^{[1
]}

Nolte, Stefan ^{[1
]}

Hohmuth, Rico ^{[2
]}

Voitsch, Martin ^{[2
]}

Richter, Wolfgang ^{[2
]}

Pradarutti, Boris ^{[3
]}

Riehemann, Stefan ^{[3
]}

Notni, Gunther ^{[3
]}

Tunnermann, Andreas ^{[3
]}

机构：

[1] Univ Jena, Inst Appl Phys, D-07743 Jena, Germany

[2] BATOP GmbH, D-07745 Jena, Germany

[3] Fraunhofer Inst Appl Opt & Precis Engn, D-07745 Jena, Germany

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 09期

关键词：

D O I：

10.1063/1.2976162

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A large-area terahertz emitter based on an interdigital finger electrode photoconductive switch on low-temperature grown GaAs attached to a hexagonal microlens array is demonstrated. The hexagonal arranged microlenses direct the incident IR excitation pulses into specified electrode gaps, resulting in constructive interference in the terahertz far field. Using a Ti:sapphire oscillator running at 80 MHz with 150 fs pulses, 6.5 mu m THz average power at 540 mW optical excitation is obtained. The maximum IR-to-terahertz conversion efficiency achieved is >= 1.35x10(-5). (c) 2008 American Institute of Physics.

引用

页数：3