期刊
OPTICS LETTERS
卷 42, 期 5, 页码 963-966出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.42.000963
关键词
-
类别
资金
- Royal Society
- National Science Foundation (NSF) [EECS 1303499]
- Directorate For Engineering [1303499] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [1303499] Funding Source: National Science Foundation
Interactions between whispering gallery modes (WGMs) and small nanoparticles are commonly modeled by treating the particle as a point dipole scatterer. This approach is assumed to be accurate as long as the nanoparticle radius, a, is small compared to the WGM wavelength.. In this Letter, however, we show that the large field gradients associated with the evanescent decay of a WGM causes the dipole theory to significantly underestimate the interaction strength and, hence, the induced WGM resonance shift, even for particles as small as a similar to lambda/10. To mitigate this issue, we employ a renormalized Born approximation to more accurately determine nanoparticle-induced resonance shifts and, hence, enable improved particle sizing. The domain of validity of this approximation is investigated, and supporting experimental results are presented. (C) 2017 Optical Society of America
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据