期刊
LASER & PHOTONICS REVIEWS
卷 8, 期 6, 页码 896-903出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201400056
关键词
Plasmonics; spaser; subwavelength hole array; directional emission
资金
- Office of Naval Research Grant [MURI N00014-13-0649]
- Air Force Office of Scientific Research Grant [FA9550-10-1-0264]
- National Science Foundation Grant [DMR-1120923]
- NSF Meta-PREM grant [1205457]
The spaser offers an opportunity to achieve coherent optical sources at nanometer scales due to the extreme confinement of optical fields. However, achievement of spasers with directional propagation in the visible wavelength region remains a challenge thus far, owing to the unique optical feedback mechanism and large dissipative losses of the metal cavity. Here, we experimentally demonstrate for the first time a spaser showing highly directional emission in the visible by using a periodic subwavelength hole array perforated in a metal film, which function as plasmonic nanocavities, along with an organic laser dye to supply gain. The lasing occurs in the red wavelength region and shows a single mode. It is suggested that the optical feedback for spasing is provided by the SPP-Bloch wave, which is supported by the fact that no spasing was attained in aperiodic holes as well as in periodic holes that do not support the SPP-Bloch wave at the spasing wavelength.
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