Optically gated tunable terahertz filters

Stefan F. Busch; Steffen Schumann; Christian Jansen; Maik Scheller; Martin Koch; Bernd M. Fischer

doi:10.1063/1.4729480

Optically gated tunable terahertz filters

Stefan F. Busch, Steffen Schumann, Christian Jansen, Maik Scheller, Martin Koch, Bernd M. Fischer

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

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.

Original language	English (US)
Article number	261109
Journal	Applied Physics Letters
Volume	100
Issue number	26
DOIs	https://doi.org/10.1063/1.4729480
State	Published - Jun 25 2012
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "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.",

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AU - Busch, Stefan F.

AU - Schumann, Steffen

AU - Jansen, Christian

AU - Scheller, Maik

AU - Koch, Martin

AU - Fischer, Bernd M.

PY - 2012/6/25

Y1 - 2012/6/25

N2 - 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.

AB - 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.

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Optically gated tunable terahertz filters

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