Terahertz beam focusing based on plasmonic waveguide scattering

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

Research output: Contribution to journalArticle

20 Citations (Scopus)


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 languageEnglish
Article number151116
JournalApplied Physics Letters
Issue number15
Publication statusPublished - 2012 Oct 8
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Monnai, Y., Altmann, K., Jansen, C., Koch, M., Hillmer, H., & Shinoda, H. (2012). Terahertz beam focusing based on plasmonic waveguide scattering. Applied Physics Letters, 101(15), [151116]. https://doi.org/10.1063/1.4759042