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Characteristics of photonic nanojets from two-layer dielectric hemisphere

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【Author】 Yunyue Liu;Xianchao Liu;Ling Li;Weidong Chen;Yan Chen;Yuerong Huang;Zhengwei Xie;College of Physics and Electronic Engineering, Sichuan Normal University;State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information,University of Electronic Science and Technology;

【机构】 College of Physics and Electronic Engineering, Sichuan Normal University； State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information,University of Electronic Science and Technology；

【摘要】 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.更多还原

【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.更多还原

【关键词】 photonic nanojet； hemisphere； micro-optics； subdiffraction；
【Key words】 photonic nanojet； hemisphere； micro-optics； subdiffraction；

【基金】 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);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)

【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2017年11期

【分类号】O43
【被引频次】3
【下载频次】19

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