消散波
领域(数学)
纳米颗粒
材料科学
纳米技术
光电子学
数学
纯数学
作者
Jonathan Ward,Yong Yang,Fuchuan Lei,Xiaonan Yu,Yun‐Feng Xiao,Síle Nic Chormaic
出处
期刊:Optica
[The Optical Society]
日期:2018-05-22
卷期号:5 (6): 674-674
被引量:69
标识
DOI:10.1364/optica.5.000674
摘要
Sensing with whispering gallery resonators (WGRs) is largely limited by the weak perturbation of the whispering gallery mode (WGM) via the evanescent field. A new sensing regime using quasi-droplet WGMs allows WGRs to move beyond the limitation of the evanescent field and push the detection sensitivity to new heights. We present experimental results on the detection of 100 nm and 500 nm polystyrene particles in aqueous solution using thin-walled, hollow WGRs supporting quasi-droplet modes. The detection sensitivity in terms of mode shift and broadening is measured, with mode shifts of 400 MHz observed for 100 nm particles. In terms of the number of linewidths, this is 276 times larger than similar experiments with microsphere WGRs, thus showing a significant increase in detection sensitivity beyond the capability of standard evanescent field sensing with WGRs.
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