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首页> 外文会议>Conference on Single Molecule Spectroscopy and Imaging; 20080119-21; San Jose,CA(US) >Optical Cavity Mode Excitations in Metal-Coated Microspheres
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Optical Cavity Mode Excitations in Metal-Coated Microspheres

机译：金属包覆的微球中的光腔模激发

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摘要

We present some recent results of our work on cavity mode excitations in metal-coated microspheres, which aims at the development of a novel type of bio-chemical sensor. In contrast to the well-known whispering gallery modes (WGM) of dielectric particles, metal-coated dielectric microspheres also allow for excitation of modes in radial direction, the so-called Fabry-Perot modes (FPM). One hurdle of such excitation is the proper adjustment of the reflectivity of the metallic coating, which either causes a low quality factor of the modes in case of insufficient thickness, or, otherwise, shields the inner cavity from outside excitation. The talk will present a novel concept on how such intricacies may be overcome by proper selection of excitation wavelength and materials choice, and will demonstrate that FPM modes may be excited in metal-coated microspheres with diameters down to 1 μm. First examples of utilization of such cavity modes for bio-chemical sensing will be given. Besides sensing, potential applications of metallic microcavities are related to the development of optical point sources, microscopic lasers, and to nonlinear nano-photonics.
机译：我们介绍了我们在金属涂层微球中的腔模激发的最新工作成果，其目的是开发一种新型的生化传感器。与电介质颗粒的众所周知的耳语通道模式（WGM）相反，金属涂层的电介质微球还允许沿径向激发模式，即所谓的Fabry-Perot模式（FPM）。这种激发的一个障碍是适当调节金属涂层的反射率，这或者在厚度不足的情况下导致模式的品质因数低，或者使内腔免受外部激发。演讲将提出一个新颖的概念，说明如何通过适当选择激发波长和材料选择来克服这种复杂性，并将证明FPM模式可以在直径低至1μm的金属涂层微球体中激发。将给出利用这种腔模式进行生化感测的第一实例。除了传感之外，金属微腔的潜在应用还与光点源，显微激光和非线性纳米光子学的发展有关。

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