Terahertz beam focusing based on plasmonic waveguide scattering

Yasuaki Monnai; Kristian Altmann; Christian Jansen; Martin Koch; Hartmut Hillmer; Hiroyuki Shinoda

doi:10.1063/1.4759042

Terahertz beam focusing based on plasmonic waveguide scattering

Yasuaki Monnai, Kristian Altmann, Christian Jansen, Martin Koch, Hartmut Hillmer, Hiroyuki Shinoda

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

20 Citations (Scopus)

Abstract

We demonstrate free-space focusing of terahertz (THz) radiation by scattering plasmonic surface-waves into the air. We use a grating of shallow holes which contains non-equidistant defects which act as scattering centers. The scattering occurs with defined phase delays such that the waves emitted in free-space interfere constructively to form a focus above the waveguide surface. In contrast to conventional lenses, this structure does not require any free-space on its backside and has great potential for integrated THz optics.

Original language	English
Article number	151116
Journal	Applied Physics Letters
Volume	101
Issue number	15
DOIs	https://doi.org/10.1063/1.4759042
Publication status	Published - 2012 Oct 8
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "We demonstrate free-space focusing of terahertz (THz) radiation by scattering plasmonic surface-waves into the air. We use a grating of shallow holes which contains non-equidistant defects which act as scattering centers. The scattering occurs with defined phase delays such that the waves emitted in free-space interfere constructively to form a focus above the waveguide surface. In contrast to conventional lenses, this structure does not require any free-space on its backside and has great potential for integrated THz optics.",

author = "Yasuaki Monnai and Kristian Altmann and Christian Jansen and Martin Koch and Hartmut Hillmer and Hiroyuki Shinoda",

note = "Funding Information: The research was partly supported by Grant-in-Aid for the JSPS Fellows (22-4238) and National Institute of Information and Communications Technology (NICT) 13701.",

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AU - Monnai, Yasuaki

AU - Altmann, Kristian

AU - Jansen, Christian

AU - Koch, Martin

AU - Hillmer, Hartmut

AU - Shinoda, Hiroyuki

N1 - Funding Information: The research was partly supported by Grant-in-Aid for the JSPS Fellows (22-4238) and National Institute of Information and Communications Technology (NICT) 13701.

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AB - We demonstrate free-space focusing of terahertz (THz) radiation by scattering plasmonic surface-waves into the air. We use a grating of shallow holes which contains non-equidistant defects which act as scattering centers. The scattering occurs with defined phase delays such that the waves emitted in free-space interfere constructively to form a focus above the waveguide surface. In contrast to conventional lenses, this structure does not require any free-space on its backside and has great potential for integrated THz optics.

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Terahertz beam focusing based on plasmonic waveguide scattering

Abstract

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