Near-field focusing of the dielectric microsphere with wavelength scale radius

CORC > 上海光学精密机械研究所 > 中国科学院上海光学精密机械研究所 > 高密度光存储技术实验室

	Near-field focusing of the dielectric microsphere with wavelength scale radius
	Guo, Hanming ; Han, Yunxuan ; Weng, Xiaoyu ; Zhao, Yanhui ; Sui, Guorong ; Wang, Yang ; Zhuang, Songlin
刊名	opt. express
	2013
卷号	21 期号:2 页码:2434
通讯作者	guo, hm (reprint author), univ shanghai sci & technol, engn res ctr opt instrument & syst, shanghai key lab modern opt syst, minist educ,sch opt elect & comp engn, 516 jungong rd, shanghai 200093, peoples r china.
英文摘要	we focus on physically analyzing the origins of the numerical aperture (na) and the spherical aberration of the microsphere with wavelength scale radius. we demonstrate that the microsphere naturally has negligible spherical aberration and high na when the refractive index contrast (ric) between the microsphere and its surrounding medium is about from 1.5 to 1.75. the reason is due to the spherical aberration compensation arising from the positive spherical aberration caused by the surface shape of the microsphere and the ric and the negative spherical aberration caused by the focal shifts due to the wavelength scale dimension of the microsphere. we show that, only within the approximate region of 1.5 <= ric <= 1.75 with the proper radius r of microsphere, the microsphere can generate a near-field focal spot with lateral resolution slightly beyond gamma/2n(s) which is also the lateral resolution limit of the dielectric microsphere. the r for each ric can be obtained by optimizing r from 1.125 lambda/n(o) to 1.275 lambda/n(o) here lambda, n(s) and n(o) are the wavelength in vacuum and the refractive indices of microsphere and its surrounding medium, respectively. for the case of the near-field focusing, we also develop a simple transform formula used to calculate the new radius from the known radius of microsphere corresponding to the original illumination wavelength when the illumination wavelength is changed. (c) 2013 optical society of america
收录类别	SCI
语种	英语
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.siom.ac.cn/handle/181231/14764]
专题	上海光学精密机械研究所_高密度光存储技术实验室
作者单位	1.[Guo, Hanming 2.Han, Yunxuan 3.Weng, Xiaoyu 4.Sui, Guorong 5.Zhuang, Songlin] Univ Shanghai Sci & Technol, Engn Res Ctr Opt Instrument & Syst, Shanghai Key Lab Modern Opt Syst, Minist Educ,Sch Opt Elect & Comp Engn, Shanghai 200093, Peoples R China 6.[Guo, Hanming 7.Zhao, Yanhui] Penn State Univ, Dept Engn Sci & Mech, University Pk, PA 16802 USA 8.[Wang, Yang] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Shanghai 201800, Peoples R China
推荐引用方式 GB/T 7714	Guo, Hanming,Han, Yunxuan,Weng, Xiaoyu,et al. Near-field focusing of the dielectric microsphere with wavelength scale radius[J]. opt. express,2013,21(2):2434.
APA	Guo, Hanming.,Han, Yunxuan.,Weng, Xiaoyu.,Zhao, Yanhui.,Sui, Guorong.,...&Zhuang, Songlin.(2013).Near-field focusing of the dielectric microsphere with wavelength scale radius.opt. express,21(2),2434.
MLA	Guo, Hanming,et al."Near-field focusing of the dielectric microsphere with wavelength scale radius".opt. express 21.2(2013):2434.