Quantum dot-embedded microspheres for remote refractive index sensing
Quantum dot-embedded microspheres for remote refractive index sensing
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DOI：
10.1063/1.2937209
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发表时间：
2008-06-02
影响因子：
4
通讯作者：
Meissner, Kenith E.
中科院分区：
文献类型：
--
作者：
Pang, Shuo;Beckham, Richard E.;Meissner, Kenith E.
提出了一种基于量子点嵌入聚苯乙烯微球的折射率传感器。微球内的光学共振，称为回音壁模式（WGM），产生窄光谱峰。对于传感应用，这些峰的光谱位移对局部折射率的变化敏感。在这项工作中，双光子激发发光的量子点耦合到几个WGM内的微谐振器。通过优化探测区域，提高了WGM的光谱可见度。当周围的折射率改变时，测量光谱偏移。实验灵敏度比米氏理论预测的灵敏度高5倍左右。(C)2008年美国物理学会。
We present a refractometric sensor based on quantum dot-embedded polystyrene microspheres. Optical resonances within a microsphere, known as whispering-gallery modes (WGMs), produce narrow spectral peaks. For sensing applications, spectral shifts of these peaks are sensitive to changes in the local refractive index. In this work, two-photon excited luminescence from the quantum dots couples into several WGMs within the microresonator. By optimizing the detection area, the spectral visibility of the WGMs is improved. The spectral shifts are measured as the surrounding index of the refraction changes. The experimental sensitivity is about five times greater than that predicted by the Mie theory. (C) 2008 American Institute of Physics.