A scatterer-assisted whispering-gallery-mode microprobe

Nanophotonics

article

Fangjie Shu¹  Xuefeng Jiang²  Guangming Zhao²  Lan Yang² 

[1] Department of Physics, Shangqiu Normal University;Department of Electrical and Systems Engineering, Washington University in St. Louis

关键词: fiber optics sensors;    microcavities;    sensors;   

DOI  :  10.1515/nanoph-2018-0063

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

A fiber-based whispering-gallery-mode (WGM) microprobe, combining both the high optical field enhancement of the WGMs and the compact structure of the optical fiber, is highly desired for sensing and imaging. Here we report a WGM microsphere resonator coupled to a single-mode fiber interfaced by a graded-index lens. By scattering a focused laser beam through a nano-scatterer, with the help of a two-step focusing technique as well as Purcell effects, the efficient far-field coupling of WGMs with an efficiency as high as 16.8% has been demonstrated in our system. With the feature of both input and output of the probe light propagating along the same fiber, such a scatterer-assisted WGM microprobe will serve as a convenient tool for sensing/imaging applications.

【 授权许可】

CC BY