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 | |
| Publication status | Published - 2012 Oct 8 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
Cite this
Terahertz beam focusing based on plasmonic waveguide scattering. / Monnai, Yasuaki; Altmann, Kristian; Jansen, Christian; Koch, Martin; Hillmer, Hartmut; Shinoda, Hiroyuki.
In: Applied Physics Letters, Vol. 101, No. 15, 151116, 08.10.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Terahertz beam focusing based on plasmonic waveguide scattering
AU - Monnai, Yasuaki
AU - Altmann, Kristian
AU - Jansen, Christian
AU - Koch, Martin
AU - Hillmer, Hartmut
AU - Shinoda, Hiroyuki
PY - 2012/10/8
Y1 - 2012/10/8
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=84867517823&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84867517823&partnerID=8YFLogxK
U2 - 10.1063/1.4759042
DO - 10.1063/1.4759042
M3 - Article
VL - 101
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 15
M1 - 151116
ER -