High Q optical resonances of polystyrene microspheres in water controlled by optical tweezers
High Q optical resonances of polystyrene microspheres in water controlled by optical tweezers
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DOI：
10.1063/1.2795332
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发表时间：
2007-10-01
影响因子：
4
通讯作者：
Borri, Paola
中科院分区：
文献类型：
--
作者：
Lutti, Julie;Langbein, Wolfgang;Borri, Paola
利用受抑全内反射的消失场耦合，测量了聚苯乙烯微球在水溶液缓冲液中的回音廊光学共振，它是与平面耦合衬底距离的函数。对于直径为30微米的微球，其本征Q因子为4×10(6)，这表明这种微谐振器有可能用于高灵敏的生物分子检测。这些测量提供了聚苯乙烯在770 nm波长的复折射率虚部的上限为2x10(-7)。(C)2007年美国物理研究所。
Using evanescent field coupling via frustrated total internal reflection, we measured whispering-gallery optical resonances of polystyrene microspheres held in aqueous buffer by optical tweezers, as a function of the distance from the planar coupling substrate. An intrinsic Q factor of 4x10(6) was found for a microsphere of 30 mu m diameter, indicating the potential of such microresonators for highly sensitive biomolecular detection. These measurements provide an upper limit of 2x10(-7) for the imaginary part of the complex refractive index of polystyrene at 770 nm wavelength. (C) 2007 American Institute of Physics.