Aufsatz in einer Fachzeitschrift
Terahertz beam focusing based on plasmonic waveguide scattering
Details zur Publikation
Autor(inn)en: | Monnai, Y.; Altmann, K.; Jansen, C.; Koch, M.; Hillmer, H.; Shinoda, H. |
Publikationsjahr: | 2012 |
Zeitschrift: | Applied Physics Letters |
Seitenbereich: | 151116 |
Abkürzung der Fachzeitschrift: | Appl. Phys. Lett. |
Jahrgang/Band : | 101 |
ISSN: | 0003-6951 |
DOI-Link der Erstveröffentlichung: |
URN / URL: |
Zusammenfassung, Abstract
We demonstrate free-space focusing of terahertz (THz) radiation by scatteringplasmonic 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 waveguidesurface. In contrast to conventional lenses, this structure does not require any free-space on its backside and has great potential for integrated THz optics.
We demonstrate free-space focusing of terahertz (THz) radiation by scatteringplasmonic 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 waveguidesurface. In contrast to conventional lenses, this structure does not require any free-space on its backside and has great potential for integrated THz optics.
