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

Gu，Guoqiang; Shen，Xingliang; Peng，Zeng; Yang，Xinfeng; Bandyopadhyay，Sankhyabrata; Feng，Jiansong; Xiao，Dongrui; Shao，Liyang

10.1117/12.2538025

2019

0277-786X

1996-756X

Proceedings of SPIE - The International Society for Optical Engineering

11186

Hangzhou, China

1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA

SPIE

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 (h), width of D-sector (w) and curvature radius (r), 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 h < r, h = r, and h < r 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.

D-shaped microfiber Finite element method Photonic nanojet Simulation

第一 ; 通讯

英语

CPCI-S ; EI

Southern University of Science and Technology[]

Optics ; Imaging Science & Photographic Technology

Optics ; Imaging Science & Photographic Technology

WOS:000511354900027

20200308042000

Dielectric properties ; Digital storage ; Evanescent fields ; Finite element method ; High intensity light ; Imaging techniques ; Microfibers ; Nanophotonics ; Numerical methods ; Optical fiber fabrication ; Optical fibers ; Optical image storage ; Optical tweezers

Electricity and Magnetism:701 ; Data Storage, Equipment and Techniques:722.1 ; Light, Optics and Optical Devices:741 ; Laser Applications:744.9 ; Imaging Techniques:746 ; Numerical Methods:921.6 ; Physical Properties of Gases, Liquids and Solids:931.2

2-s2.0-85077801168

Scopus

Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Gu，Guoqiang,Shen，Xingliang,Peng，Zeng,et al. Numerical investigation of photonic nanojets generated from D-shaped dielectric microfibers[C]. 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA:SPIE,2019.