Mapping the refractive index of optically transparent samples by means of optical nanoantenna attached to fiber microaxicon

被引：0
|
作者：
Kuchmizhak, Aleksandr A. [1 ]
Pavlov, Dmitriy V. [2 ]
Kulchin, Yuri N. [1 ,2 ]
Vitrik, Oleg B. [1 ,2 ]
机构：
[1] Russian Acad Sci, Far Eastern Branch, Inst Automat & Control Proc, Vladivostok 690041, Russia
[2] Far Eastern Fed Univ, Vladivostok 690041, Russia
来源：
OPTICS EXPRESS | 2014年 / 22卷 / 11期
基金：
俄罗斯基础研究基金会;
关键词：
NEAR-FIELD; PLASMON RESONANCE; ANTENNA PROBES; NANOPARTICLES; RECOGNITION; GENERATION; SHAPE; SIZE;
D O I：
10.1364/OE.22.013146
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We demonstrate analytically and numerically that the detection of the spectral response of a single spherical Au nanoantenna allows one to map very small (down to 5.10(-4) RIU) variations of the refractive index of an optically transparent sample. Spectral shift of the dipole local plasmon resonance wavelength of the nanoantenna and the spectral sensitivity of the method developed was estimated by using simple analytical quasi-static model. A pointed scanning probe based on fiber microaxicon with the Au spherical nanoantenna attached to its tip was proposed to realize the RI mapping method. Finite-difference time-domain numerical simulations of the spectral properties of the proposed probe are in good agreement with the theoretical quasi-electrostatic estimations for a radius of the nanoantenna not exceeding the skin depth of Au. (C) 2014 Optical Society of America
引用
收藏
页码：13146 / 13154
页数：9
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