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Proceedings Paper

Numerical investigation of photonic nanojets generated from D-shaped dielectric microfibers
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Paper Abstract

Photonic nanojet (PNJ) is a tightly focused, non-resonant and spatially highly confined light beam that emerging on the shadow side surface of a light-illuminated lossless dielectric microparticle with a diameter comparable or slightly larger than the wavelength of the incident light. PNJ’s significant properties of subwavelength transverse beamwidth, high light intensity and propagation capability of extending evanescent field region make it get a lot of applications in a broad range of areas, such as optical signals enhancement, optical imaging, optical tweezers, optical data storage, optical waveguide, optical sensing, optical nanofabrication, optical switching, etc. The formation characteristics of the PNJ are depended on the geometrical morphologies and dielectric properties of the microparticles, the surrounding medium and the natures of illumination light. Over the past 15 years, PNJs generated from different structures (cylinder, sphere, ellipsoid, disk, cuboid, core-shell, multilayer, assembled nanofibles, etc.) were investigated. In this paper, a unique structure of D-shaped microfibers in terms of height (hD), width of D-sector (wD) and curvature radius (rD), which can be fabricated through optical fiber polishing and optical fiber tapering techniques, was presented and studied with a finite-element- based numerical method. Three different cases of hD < rD, hD = rD, and hD < rD were chosen as typical research models. The PNJ parameters of focal distance, full-width at half-maximum, decay length and maximum light intensity with respect to the variations of widths of D-sector and rotation angles were systematically analyzed. The research results provide a good insight to develop optical microprobes and optical microlenses with long working distance.

Paper Details

Date Published: 19 November 2019
PDF: 7 pages
Proc. SPIE 11186, Advanced Optical Imaging Technologies II, 111861H (19 November 2019); doi: 10.1117/12.2538025
Show Author Affiliations
Guoqiang Gu, Southern Univ. of Science and Technology of China (China)
Xingliang Shen, Southern Univ. of Science and Technology of China (China)
Zeng Peng, Southern Univ. of Science and Technology of China (China)
Xinfeng Yang, Southern Univ. of Science and Technology of China (China)
Sankhyabrata Bandyopadhyay, Southern Univ. of Science and Technology of China (China)
Jiansong Feng, Southern Univ. of Science and Technology of China (China)
Dongrui Xiao, Southern Univ. of Science and Technology of China (China)
Liyang Shao, Southern Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 11186:
Advanced Optical Imaging Technologies II
Xiao-Cong Yuan; P. Scott Carney; Kebin Shi; Michael G. Somekh, Editor(s)

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