Journal article
Terahertz beam focusing based on plasmonic waveguide scattering
Publication Details
Authors: | Monnai, Y.; Altmann, K.; Jansen, C.; Koch, M.; Hillmer, H.; Shinoda, H. |
Publication year: | 2012 |
Journal: | Applied Physics Letters |
Pages range : | 151116 |
Journal acronym: | Appl. Phys. Lett. |
Volume number: | 101 |
ISSN: | 0003-6951 |
DOI-Link der Erstveröffentlichung: |
URN / URL: |
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.
