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A Scatterer-assisted Whispering-gallery-mode Microprobe by Fangjie Shu; Xuefeng Jiang; Guangming Zhao; Lan Yang is a Engineering article available to read on EtoBox.

What is A Scatterer-assisted Whispering-gallery-mode Microprobe about?

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.

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Author

Fangjie Shu; Xuefeng Jiang; Guangming Zhao; Lan Yang

Publisher

Walter de Gruyter GmbH

Published

2018

Language

EN

Field

Engineering (Physical Sciences)