Terahertz wave emission from plasmonic chiral metasurfaces

Plasmonic chiral metasurfaces with pinwheel-like structures are fabricated on silver films using a focused ion-beam milling technique. In time-domain spectroscopy, we observe terahertz (THz) wave emission from metasurfaces irradiated by a near-infrared Ti:sapphire ultrashort pulsed laser. The origin...

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Veröffentlicht in:	Applied physics. A, Materials science & processing Materials science & processing, 2016-03, Vol.122 (3), p.1-5, Article 157
Hauptverfasser:	Matsui, Takahiro, Tomita, Satoshi, Asai, Motoki, Tadokoro, Yuzuru, Takano, Keisuke, Nakajima, Makoto, Hangyo, Masanori, Yanagi, Hisao
Format:	Artikel
Sprache:	eng
Schlagworte:	Acceleration Advanced Metamaterials and Nanophotonics Characterization and Evaluation of Materials Computer simulation Condensed Matter Physics Emission spectroscopy Ionization Machines Manufacturing Materials science Nanotechnology Near infrared radiation Optical and Electronic Materials Physics Physics and Astronomy Plasmonics Processes Surfaces and Interfaces Thin Films Wave generation
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Zusammenfassung:	Plasmonic chiral metasurfaces with pinwheel-like structures are fabricated on silver films using a focused ion-beam milling technique. In time-domain spectroscopy, we observe terahertz (THz) wave emission from metasurfaces irradiated by a near-infrared Ti:sapphire ultrashort pulsed laser. The origin of the THz wave generation is likely to be tunnelling ionization accompanied with photoelectron acceleration by ponderomotive force. Numerical simulation is carried out toward improvement of the chiral metasurfaces for better emission of circularly polarized THz waves.
ISSN:	0947-8396 1432-0630
DOI:	10.1007/s00339-016-9657-y