Calculating the resonance radius of a dielectric cylinder under illumination by a plane TE-wave

被引：7

作者：

Kotlyar, V. V. ^{[1
,2
]}

Kovalev, A. A. ^{[1
,2
]}

Kozlov, D. A. ^{[1
,2
]}

机构：

[1] Russian Acad Sci, Image Proc Syst Inst, Samara, Russia

[2] Samara State Aerosp Univ, Samara, Russia

来源：

OPTIK | 2016年 / 127卷 / 08期

关键词：

Whispering gallery mode; Dielectric cylinder; Resonance; NANOJET; RESOLUTION;

D O I：

10.1016/j.ijleo.2016.01.058

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

When a dielectric circular cylinder of specific radius is illuminated by a plane wave, a whispering gallery mode (WGM) is generated in the cylinder. This resonance radius of the cylinder can be derived numerically on the assumption of the maximal value of the coefficient in a Bessel series expansion of the E-field amplitude of the TE-wave. Equations composed of cylindrical functions are obtained, allowing the cylinder's resonance radius to be calculated approximately. For instance, based on the equations, one can determine eight initial significant digits of the cylinder resonance radius for a WGM with mode number 26 to be generated. In a cylinder with refractive index 1.59 and resonance radius 3.469239 lambda (lambda is wavelength), a WGM with mode number 30 is excited. Such a cylinder can generate an external focal spot of size 0.15 lambda, with its maximal intensity being 1500 times larger than that of incident light. (C) 2016 Elsevier GmbH. All rights reserved.

引用

页码：3803 / 3808

页数：6

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