基于光学天线的矢量光场的聚焦与调控
发布时间：2018-10-12 17:13
【摘要】：光作为信息的载体,其基本性质中的频率、振幅、相位早己被深入研究并在各个领域得到广泛应用,近些年,光的偏振特性及对偏振态的调控成为研究热点。矢量光场因具有特殊的空间演化偏振态而受到关注,它的聚焦与调控特性在光学微加工、粒子捕捉、光学储存以及光学显微等领域有着潜在的应用。本文研究了矢量光场在大数值孔径下的聚焦特性,并设计了一种离散型复振幅光瞳滤波器来实现矢量光场的相位、振幅及偏振态的调控。首先,基于电-磁偶极天线的反向辐射场构建理论与Richards-Wolf矢量积分衍射理论,通过设计偶极子阵列结构,反向推演出光瞳面上入射光场的分布模式。根据期望场的特性,通过对偶极子阵列的初始相位差、振幅比、间距及辐射场进行调控和优化,可灵活的操控光链结构。经满足正弦条件的大数值孔径透镜聚焦后,在焦点附近获得了一个三维“光链”聚焦场。与之前的聚焦场相比,这个三维“光链”能够同时捕捉多个粒子,这种偶极子聚焦场在粒子捕捉、传送及自组装等方面有着潜在的应用。其次,根据狭槽天线与线偏振片的相似性,设计了刻蚀有多个不同方向狭槽天线环形阵列的超表面,作为离散型复振幅光瞳滤波器使用,可以用来实现特殊的聚焦矢量光场。狭槽天线具有局域调控入射光场振幅和相位的特性,各个环带上具有各自特定的透射率,同时具有特定的二元相移(0/π)分布。以径向偏振入射光为例,经该滤波器并经大数值孔径透镜紧聚焦后,可获得衍射受限的超长三维光管场。这种结构的超表面对矢量光场的产生与调控提供了新途径。
[Abstract]:As a carrier of information, the frequency, amplitude and phase of the fundamental properties of light have been deeply studied and widely used in various fields. In recent years, the polarization characteristics of light and the regulation of polarization state have become a research focus. Vector light field has attracted much attention because of its special spatial evolution polarization state. Its focusing and controlling characteristics have potential applications in the fields of optical microprocessing, particle capture, optical storage and optical microscopy. In this paper, the focusing characteristics of vector light field in large numerical aperture are studied, and a discrete complex amplitude pupil filter is designed to control the phase, amplitude and polarization state of vector light field. Firstly, based on the inverse radiation field construction theory of electric-magnetic dipole antenna and the Richards-Wolf vector integral diffraction theory, the distribution mode of incident light field on the pupil surface is derived by designing the dipole array structure. According to the characteristic of expected field, the structure of light chain can be controlled flexibly by adjusting and optimizing the initial phase difference, amplitude ratio, spacing and radiation field of the dipole array. A three-dimensional "optical chain" focusing field is obtained near the focal point by a large numerical aperture lens which satisfies the sinusoidal condition. Compared with previous focusing fields, this three-dimensional "optical chain" can capture multiple particles at the same time. This kind of dipole focusing field has potential applications in particle capture, transport and self-assembly. Secondly, according to the similarity between the narrow slot antenna and the linear polarizer, the supersurface of the ring array with several different directions is designed and used as a discrete complex amplitude pupil filter, which can be used to realize the special focusing vector light field. The narrow-slot antenna has the characteristic of locally regulating the amplitude and phase of the incident light field. Each ring band has its own specific transmittance and a special binary phase shift (0 / 蟺) distribution. Taking the radial polarization incident light as an example, the diffraction-limited three-dimensional optical tube field can be obtained by using the filter and the large numerical aperture lens. The supersurface of this structure provides a new way to generate and regulate the vector light field.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713;O43
本文编号：2266927
[Abstract]:As a carrier of information, the frequency, amplitude and phase of the fundamental properties of light have been deeply studied and widely used in various fields. In recent years, the polarization characteristics of light and the regulation of polarization state have become a research focus. Vector light field has attracted much attention because of its special spatial evolution polarization state. Its focusing and controlling characteristics have potential applications in the fields of optical microprocessing, particle capture, optical storage and optical microscopy. In this paper, the focusing characteristics of vector light field in large numerical aperture are studied, and a discrete complex amplitude pupil filter is designed to control the phase, amplitude and polarization state of vector light field. Firstly, based on the inverse radiation field construction theory of electric-magnetic dipole antenna and the Richards-Wolf vector integral diffraction theory, the distribution mode of incident light field on the pupil surface is derived by designing the dipole array structure. According to the characteristic of expected field, the structure of light chain can be controlled flexibly by adjusting and optimizing the initial phase difference, amplitude ratio, spacing and radiation field of the dipole array. A three-dimensional "optical chain" focusing field is obtained near the focal point by a large numerical aperture lens which satisfies the sinusoidal condition. Compared with previous focusing fields, this three-dimensional "optical chain" can capture multiple particles at the same time. This kind of dipole focusing field has potential applications in particle capture, transport and self-assembly. Secondly, according to the similarity between the narrow slot antenna and the linear polarizer, the supersurface of the ring array with several different directions is designed and used as a discrete complex amplitude pupil filter, which can be used to realize the special focusing vector light field. The narrow-slot antenna has the characteristic of locally regulating the amplitude and phase of the incident light field. Each ring band has its own specific transmittance and a special binary phase shift (0 / 蟺) distribution. Taking the radial polarization incident light as an example, the diffraction-limited three-dimensional optical tube field can be obtained by using the filter and the large numerical aperture lens. The supersurface of this structure provides a new way to generate and regulate the vector light field.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713;O43
【参考文献】
相关期刊论文 前2条
1 易煦农;李瑛;刘亚超;凌晓辉;张志友;罗海陆;;基于Metasurface的柱矢量光束的产生[J];物理学报;2014年09期
2 王振林;;表面等离激元研究新进展[J];物理学进展;2009年03期
相关博士学位论文 前2条
1 郭丽娇;新型矢量光束的调控及其应用技术基础研究[D];南开大学;2013年
2 芮光浩;利用光学天线裁剪光学矢量场[D];中国科学技术大学;2013年
，本文编号：2266927
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