Characteristics of photonic nanojets from two-layer dielectric hemisphere

doi:10.1088/1674-1056/26/11/114201

Abstract

The properties of the photonic nanojet generated by a two-layer dielectric microsphere are studied. Simulation results indicate that this novel structure can generate a photonic nanojet outside its volume when the refractive index contrast relative to the background medium is higher than 2:1 in the condition of plane wave incidence. When the refractive index is smaller than 2, we show that an ultralong nanojet generated by the two-layer hemisphere has an extension of 28.2 wavelengths, and compared with the homogeneous dielectric hemisphere, it has superior performance in jet length and focal distance. Its dependence on the configuration and refractive index is investigated numerically. According to the simulation of the two-layer dielectric microsphere, a photonic nanojet with a full width at half maximum (FWHM) less than 1/2 wavelength is obtained and the tunable behaviors of the photonic nanojet are demonstrated by changing the reflective indices of the material or radius contrast ratio.

Keywords: photonic nanojet hemisphere micro-optics subdiffraction

Received: 23 May 2017
Revised: 10 July 2017
Accepted manuscript online:

PACS:	42.25.Bs	(Wave propagation, transmission and absorption)
	42.50.St	(Nonclassical interferometry, subwavelength lithography)
	78.67.-n	(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

Fund:

Project supported by State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Sciences; Sichuan Provincial Department of Education, China (Grant No. 16ZA0047); the State Key Laboratory of Metastable Materials Science and Technology, Yansan University, China (Grant No. 201509); and the Large Precision Instruments Open Project Foundation of Sichuan Normal University, China (Grant Nos. DJ2015-57, DJ2015-58, DJ2015-60, DJ2016-58, and DJ2016-59).

Corresponding Authors: Zhengwei Xie
E-mail: zzwxie@aliyun.com

Cite this article:

Yunyue Liu(刘昀玥), Xianchao Liu(刘贤超), Ling Li(李玲), Weidong Chen(陈卫东), Yan Chen(陈艳), Yuerong Huang(黄跃容), Zhengwei Xie(谢征微) Characteristics of photonic nanojets from two-layer dielectric hemisphere 2017 Chin. Phys. B 26 114201

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