arXiv 0903.38292009-03-23physics.optics

回音壁模式微Kylix谐振器

Whispering-gallery mode micro-kylix resonators

Mher Ghulinyan, Alessandro Pitanti, Georg Pucker, Lorenzo Pavesi

备注：: 5 pages
发表信息：: Optics Express 17, 9434-9441 (2009)
DOI：: 10.1364/OE.17.009434

摘要：

由于它们能够将电磁能量限制在超小的电介质体积中，微盘、环形和环形谐振器对于特定应用和基础研究都具有重要意义。通常，这些器件内的各种损耗通道的贡献导致有限的频谱窗口（Q带），其中最高模式Q因子显现。在这里，我们描述了一种策略，用于调谐Q波段使用一类新的微谐振器，命名为微kylix谐振器，其中工程应力在一个最初的平面盘的结果在凹或凸的设备。为了将Q带向短波长移动60nm，需要在扁平微盘中减小50%的直径，这导致抑制Q的严重辐射损失。与微kylix，我们实现了类似的调整，甚至更高的Q值的两个数量级更小的直径修改（0.4%）。这种现象依赖于几何形状引起的智能材料吸收和辐射损失相关的Q因子的修改后的分散体之间的相互作用。微Kylix器件可以为光子学和微谐振器物理提供新的功能和新的技术解决方案。

英文摘要：

Owing to their ability to confine electromagnetic energy in ultrasmall dielectric volumes, micro-disk, ring and toroid resonators hold interest for both specific applications and fundamental investigations. Generally, contributions from various loss channels within these devices lead to limited spectral windows (Q-bands) where highest mode Q-factors manifest. Here we describe a strategy for tuning Q-bands using a new class of micro-resonators, named micro-kylix resonators, in which engineered stress within an initially flat disk results in either concave or convex devices. To shift the Q-band by 60nm towards short wavelengths in flat micro-disks a 50% diameter reduction is required, which causes severe radiative losses suppressing Q's. With a micro-kylix, we achieve similar tuning and even higher Q's by two orders of magnitude smaller diameter modification (0.4%). The phenomenon relies on geometry-induced smart interplay between modified dispersions of material absorption and radiative loss-related Q-factors. Micro-kylix devices can provide new functionalities and novel technological solutions for photonics and micro-resonator physics.

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