Angular-modulated spatial distribution of ultrahigh-order modes assisted by random scattering

doi:10.1088/1674-1056/26/11/114210

Abstract In designing an optical waveguide with metallic films on a nanometer scale, the random scattering by the natural roughness of the thin film is always ignored. In this paper, we demonstrate that for the ultrahigh-order modes (UOMs) in the symmetric metal cladding waveguide, such a scattering leads to drastic variations in their spatial distribution at different incident angles. Owing to the high mode density of the UOMs, the random scattering induced coupling can be easily related to different modes with different propagation directions or wavenumbers. At small incident angles, the intra-mode coupling dominates, which results in a spatial distribution in the form of concentric rings. At large incident angles, the inter-mode coupling plays the most important role and leads to an array-like pattern. Experimental evidence via optically trapped nanoparticles support the theoretical hypothesis.

Keywords: metallic waveguide random scattering optical trapping

Received: 27 May 2017
Revised: 21 June 2017
Accepted manuscript online:

PACS:	42.79.Gn	(Optical waveguides and couplers)
	87.80.Cc	(Optical trapping)
	52.25.Tx	(Emission, absorption, and scattering of particles)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11404092 and 11574072) and the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK20140246 and BK20160417).

Corresponding Authors: Cheng Yin
E-mail: cyin.phys@gmail.com

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Xue-Fen Kan(阚雪芬), Cheng Yin(殷澄), Tian Xu(许田), Fan Chen(陈凡), Jian Li(李建), Qing-Bang Han(韩庆邦), Xian-Feng Chen(陈险峰) Angular-modulated spatial distribution of ultrahigh-order modes assisted by random scattering 2017 Chin. Phys. B 26 114210

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Angular-modulated spatial distribution of ultrahigh-order modes assisted by random scattering

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