【摘要】：光作為信息的載體,其基本性質(zhì)中的頻率、振幅、相位早己被深入研究并在各個領(lǐng)域得到廣泛應(yīng)用,近些年,光的偏振特性及對偏振態(tài)的調(diào)控成為研究熱點(diǎn)。矢量光場因具有特殊的空間演化偏振態(tài)而受到關(guān)注,它的聚焦與調(diào)控特性在光學(xué)微加工、粒子捕捉、光學(xué)儲存以及光學(xué)顯微等領(lǐng)域有著潛在的應(yīng)用。本文研究了矢量光場在大數(shù)值孔徑下的聚焦特性,并設(shè)計了一種離散型復(fù)振幅光瞳濾波器來實(shí)現(xiàn)矢量光場的相位、振幅及偏振態(tài)的調(diào)控。首先,基于電-磁偶極天線的反向輻射場構(gòu)建理論與Richards-Wolf矢量積分衍射理論,通過設(shè)計偶極子陣列結(jié)構(gòu),反向推演出光瞳面上入射光場的分布模式。根據(jù)期望場的特性,通過對偶極子陣列的初始相位差、振幅比、間距及輻射場進(jìn)行調(diào)控和優(yōu)化,可靈活的操控光鏈結(jié)構(gòu)。經(jīng)滿足正弦條件的大數(shù)值孔徑透鏡聚焦后,在焦點(diǎn)附近獲得了一個三維“光鏈”聚焦場。與之前的聚焦場相比,這個三維“光鏈”能夠同時捕捉多個粒子,這種偶極子聚焦場在粒子捕捉、傳送及自組裝等方面有著潛在的應(yīng)用。其次,根據(jù)狹槽天線與線偏振片的相似性,設(shè)計了刻蝕有多個不同方向狹槽天線環(huán)形陣列的超表面,作為離散型復(fù)振幅光瞳濾波器使用,可以用來實(shí)現(xiàn)特殊的聚焦矢量光場。狹槽天線具有局域調(diào)控入射光場振幅和相位的特性,各個環(huán)帶上具有各自特定的透射率,同時具有特定的二元相移(0/π)分布。以徑向偏振入射光為例,經(jīng)該濾波器并經(jīng)大數(shù)值孔徑透鏡緊聚焦后,可獲得衍射受限的超長三維光管場。這種結(jié)構(gòu)的超表面對矢量光場的產(chǎn)生與調(diào)控提供了新途徑。
[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.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN713;O43

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本文編號：2266927