Near-field focusing of the dielectric microsphere with wavelength scale radius
文献类型：期刊论文
| 作者 | Guo, Hanming; Han, Yunxuan; Weng, Xiaoyu; Zhao, Yanhui; Sui, Guorong; Wang, Yang; Zhuang, Songlin |
| 刊名 | opt. express
 |
| 出版日期 | 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 |
| 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. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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