The design and simulated performance of a coated nano-particle laser
The design and simulated performance of a coated nano-particle laser
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DOI：
10.1364/oe.15.002622
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发表时间：
2007-03-05
期刊：
影响因子：
3.8
通讯作者：
Ziolkowski, Richard W.
中科院分区：
文献类型：
--
作者：
Gordon, Joshua A.;Ziolkowski, Richard W.
研究了由(有源)三能级增益介质核和周围等离子体金属壳组成的同心纳米球壳的光学性质。目前光学超材料的研究表明，在纳米包覆的球形粒子中加入无损等离子体材料来实现负介电常数可以产生新的光学性质，如共振散射以及透明或不可见。然而，在实际应用中，等离子体材料在光学频率上有很高的损耗。研究发现，随着活性物质的引入，可以克服等离子体壳层的本征吸收，并在这些包覆的纳米球壳粒子的散射和吸收截面上观察到新的光学性质。此外，还观察到了比可调谐的、共振的纳米涂层球壳大10(3)量级的“超级”共振。这一观察结果表明，实现高度亚波长激光器的可能性比传统的半波长腔长标准低一个数量级以上。通过数值计算得到了不同构型下镀膜纳米粒子(CNP)激光器的工作特性。(C)2007年美国光学学会。
The optical properties of a concentric nanometer-sized spherical shell comprised of an (active) 3-level gain medium core and a surrounding plasmonic metal shell are investigated. Current research in optical metamaterials has demonstrated that including lossless plasmonic materials to achieve a negative permittivity in a nano-sized coated spherical particle can lead to novel optical properties such as resonant scattering as well as transparency or invisibility. However, in practice, plasmonic materials have high losses at optical frequencies. It is observed that with the introduction of active materials, the intrinsic absorption in the plasmonic shell can be overcome and new optical properties can be observed in the scattering and absorption cross-sections of these coated nano-sized spherical shell particles. In addition, a "super" resonance is observed with a magnitude that is 10(3) greater than that for a tuned, resonant passive nano-sized coated spherical shell. This observation suggests the possibility of realizing a highly sub-wavelength laser with dimensions more than an order of magnitude below the traditional half-wavelength cavity length criteria. The operating characteristics of this coated nano-particle (CNP) laser are obtained numerically for a variety of configurations. (c) 2007 Optical Society of America.