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| 聚焦光场激发下中心对称球形粒子的二次谐波产生 | |
| 引用本文： | 霍丙忠,王湘晖,常胜江,曾明.聚焦光场激发下中心对称球形粒子的二次谐波产生[J].光学学报,2012,32(2):219001-233. |
| 作者姓名： | 霍丙忠 王湘晖 常胜江 曾明 |
| 作者单位： | 霍丙忠:南开大学现代光学研究所光电信息技术科学教育部重点实验室, 天津 300071 王湘晖:南开大学现代光学研究所光电信息技术科学教育部重点实验室, 天津 300071 常胜江:南开大学现代光学研究所光电信息技术科学教育部重点实验室, 天津 300071 曾明:天津大学电气与自动化工程学院, 天津 300072 |
| 基金项目： | 国家863计划(2011AA010205)、国家973计划(2007CB310403)、国家自然科学基金(10704043，61171027)、天津市应用基础研究重点项目(10JCZDJC15200)和高等学校博士学科点专项科研基金（20090031110033）资助课题。 |
| 摘 要： | 在聚焦光场矢量衍射理论的基础上,利用贝塞尔函数的微分递推关系,推导了聚焦光场的梯度变化表达式。根据中心对称材料二次谐波产生的唯象模型,研究了单个中心对称球形纳米颗粒在聚焦光场激发下的二次谐波产生,考察了表面响应和体效应产生的二次谐波辐射分布随着数值孔径增大的变化规律,并利用聚焦光场及其梯度场分布特性讨论差异产生的原因。研究结果表明,激发光场的聚焦程度对体响应的影响更为显著。 |
| 关 键 词： | 非线性光学 二次谐波产生 中心对称介质 聚焦光场 体响应 |
| 收稿时间： | 2011/8/2 |
Second Harmonic Generation of Individual Centrosymmetric Spherical Particle Excited by a Focused Beam |
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| Huo Bingzhong,Wang Xianghui,Chang Shengjiang,Zeng Ming.Second Harmonic Generation of Individual Centrosymmetric Spherical Particle Excited by a Focused Beam[J].Acta Optica Sinica,2012,32(2):219001-233. | |
| Authors: | Huo Bingzhong Wang Xianghui Chang Shengjiang Zeng Ming |
| Institution: | 1 Key Laboratory of Opto-Electronic Information Science and Technology,Ministry of Education,Institute of Modern Optics,Nankai University,Tianjin 300071,China 2 School of Electrical Engineering and Automation,Tianjin University,Tianjin 300072,China |
| Abstract: | Based on vectorial diffraction theory, an analytical integral representation to calculate the field gradient of focused electromagnetic fields is derived by use of the differential recursion formula of the Bessel functions with different order. Within the phenomenological model for second harmonic generation (SHG) of centrosymmetric material, second harmonic (SH) generation of single centrosymmetric spherical particle excited by a focused beam is investigated. With increasing numerical aperture, the SH radiation distributions of the surface and bulk responses are compared and discussed in term of the properties of the intensity and gradient distributions of the focused field. The results indicate that the influence of the variation of the focused field on the bulk response is more remarkable. |
| Keywords: | nonlinear optics second harmonic generation centrosymmetric medium focused light field bulk response |
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