Optically gated tunable terahertz filters

被引：32

作者：

Busch, Stefan F. ^{[1
]}

Schumann, Steffen ^{[1
]}

Jansen, Christian ^{[1
]}

Scheller, Maik ^{[1
]}

Koch, Martin ^{[1
]}

Fischer, Bernd M. ^{[1
,2
]}

机构：

[1] Univ Marburg, Fachbereich Phys, D-35037 Marburg, Germany

[2] French German Res Inst St Louis, F-68301 St Louis, France

来源：

APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 26期

关键词：

FREQUENCIES;

D O I：

10.1063/1.4729480

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present a fast and flexible terahertz filter based on diffractive gratings combined with an optically gated modulator. The terahertz radiation is diffracted by blazed gratings, and the individual frequency components are focused onto an optically excited semiconductor. Different light patterns are used to create free carriers in the bulk semiconductor material, leading to a spatial modulation of its transmission. This approach enables us to damp arbitrary frequencies and allows us to design and implement filters with almost any frequency response. By using the digital light processing technique, the switching time between different filter settings is as short as 16 ms. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729480]

引用

页数：3

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