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Title: Toroidal lasing spaser
Authors: Huang, Yao-Wei
Chen, Wei Ting
Wu, Pin Chieh
Fedotov, Vassili A.
Zheludev, Nikolay I.
Tsai, Din Ping
Keywords: DRNTU::Science::Physics::Radiation physics
Issue Date: 2013
Source: Huang, Y. W., Chen, W. T., Wu, P. C., Fedotov, V. A., Zheludev, N. I., & Tsai, D. P. (2013). Toroidal Lasing Spaser. Scientific Reports, 3(1237).
Series/Report no.: Scientific reports
Abstract: Toroidal shapes are often found in bio-molecules, viruses, proteins and fats, but only recently it was proved experimentally that toroidal structures can support exotic high-frequency electromagnetic excitations that are neither electric or magnetic multipoles. Such excitations, known as toroidal moments, could be playing an important role in enhancing inter-molecular interaction and energy transfer due to its higher electromagnetic energy confinement and weaker coupling to free space. Using a model toroidal metamaterial system, we show that coupling optical gain medium with high Q-factor toroidal resonance mode can enhance the single pass amplification to up to 65 dB. This offers an opportunity of creating the “toroidal” lasing spaser, a source of coherent optical radiation that is fueled by toroidal plasmonic oscillations in the nanostructure.
DOI: 10.1038/srep01237
Schools: School of Physical and Mathematical Sciences 
Rights: © 2013 The Author(s). This paper was published in Scientific Reports and is made available as an electronic reprint (preprint) with permission of The Author(s). The paper can be found at the following official DOI: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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