Light Amplification by Stimulated Plasmon Emission

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Science 27 July 2012:

Vol. 337 no. 6093 pp. 450-453
DOI: 10.1126/science.1223504


Plasmonic Nanolaser Using Epitaxially Grown Silver Film

Yu-Jung Lu1,*, Jisun Kim2,*, Hung-Ying Chen1, Chihhui Wu2, Nima Dabidian2, Charlotte E. Sanders2, Chun-Yuan Wang1, Ming-Yen Lu3, Bo-Hong Li4, Xianggang Qiu4, Wen-Hao Chang5, Lih-Juann Chen3, Gennady Shvets2, Chih-Kang Shih2,†, Shangjr Gwo1,†
Author Affiliations

1Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan. 2Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA. 3Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu 30013, Taiwan. 4Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. 5Department of Electrophysics, National Chiao-Tung University, Hsinchu 30010, Taiwan.

* These authors contributed equally to this work.


A nanolaser is a key component for on-chip optical communications and computing systems. Here, we report on the low-threshold, continuous-wave operation of a subdiffraction nanolaser based on surface plasmon amplification by stimulated emission of radiation. The plasmonic nanocavity is formed between an atomically smooth epitaxial silver film and a single optically pumped nanorod consisting of an epitaxial gallium nitride shell and an indium gallium nitride core acting as gain medium. The atomic smoothness of the metallic film is crucial for reducing the modal volume and plasmonic losses. Bimodal lasing with similar pumping thresholds was experimentally observed, and polarization properties of the two modes were used to unambiguously identify them with theoretically predicted modes. The all-epitaxial approach opens a scalable platform for low-loss, active nanoplasmonics. [Emphasis mine.]
Received for publication 18 April 2012.
Accepted for publication 14 June 2012.

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