Barucci Andrea, Grimaldi Immacolata Angelica, Persichetti Gianluca, Berneschi Simone, Soria Silvia, Tiribilli Bruno, Bernini Romeo, Baldini Francesco, Conti Gualtiero Nunzi
Opt Express. 2018 Apr 30;26(9):11737-11743. doi: 10.1364/OE.26.011737.
Whispering Gallery Mode (WGM) micro-resonators like microspheres or microtoroids are typically used as high-Q cavity substrate on which a functional film coating is deposited. In order to exploit the coating properties a critical step is the efficient excitation of WGMs mainly contained inside the deposited layer. We developed a simple method able to assess whether or not these modes are selectively excited. The method is based on monitoring the thermal shift of the excited resonance, which uniquely depends on the thermo-optic coefficient and on the thermal expansion coefficient of the material in which the mode is embedded.
耳语回廊模式（WGM）微谐振器，如微球或微环面，通常用作高Q腔基板，在其上沉积功能薄膜涂层。为了利用涂层特性，一个关键步骤是有效激发主要包含在沉积层内的WGM。我们开发了一种简单的方法，能够评估这些模式是否被选择性激发。该方法基于监测激发共振的热位移，热位移唯一地取决于模式所嵌入材料的热光系数和热膨胀系数。
