發(fā)布時(shí)間：2018-01-19 03:27

  本文關(guān)鍵詞： 超表面 光學(xué)分束 折射率傳感 偏振檢測(cè) 多焦點(diǎn)透鏡　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：傳統(tǒng)光學(xué)器件對(duì)光束波前的調(diào)制是通過(guò)光束經(jīng)過(guò)器件時(shí)的連續(xù)相位延遲積累實(shí)現(xiàn)的，而超表面（metasurface）對(duì)光束的相位調(diào)制是不連續(xù)的。超表面是由一系列具有納米尺寸的等離子體天線單元組成的超薄金屬平板，或單層，或多層，尺寸很小，對(duì)光束波前可以實(shí)現(xiàn)2π范圍的靈活調(diào)制。組成超表面的天線形狀不同，其性能也大不相同。U形孔徑天線超表面是在單層金板上刻蝕一系列U形槽，相對(duì)于其它超表面，U形孔徑天線超表面結(jié)構(gòu)更加簡(jiǎn)單，厚度僅有幾十納米。本論文基于U形孔徑天線超表面進(jìn)行了多種基礎(chǔ)光學(xué)元件的研究，包括光學(xué)分束，折射率傳感，單焦點(diǎn)聚焦，偏振態(tài)檢測(cè)及多焦點(diǎn)透鏡。 本文首先進(jìn)行了基于超表面的廣義Snell定律的推導(dǎo)，利用U形孔徑天線超表面實(shí)現(xiàn)了反常折射現(xiàn)象，驗(yàn)證了廣義Snell定律的準(zhǔn)確性。進(jìn)而利用超表面分區(qū)設(shè)計(jì)的方法設(shè)計(jì)實(shí)現(xiàn)了多光路分束。推導(dǎo)出了反常折射角與環(huán)境折射率的理論關(guān)系，模擬仿真得到了反常折射角與環(huán)境折射率的響應(yīng)曲線，驗(yàn)證了超表面的折射率傳感功能。根據(jù)傳統(tǒng)柱透鏡的相位調(diào)制曲線，設(shè)計(jì)實(shí)現(xiàn)了基于U形孔徑天線超表面的單焦點(diǎn)透鏡，得到了很好的聚焦仿真結(jié)果。接著探究了入射光偏振態(tài)對(duì)相應(yīng)功能的影響，，發(fā)現(xiàn)U形孔徑天線超表面對(duì)入射光的不同偏振態(tài)（左旋圓偏振或右旋圓偏振）表現(xiàn)出完全相反的現(xiàn)象，即利用U形孔徑天線超表面可以實(shí)現(xiàn)偏振態(tài)檢測(cè)功能。 本文最重要的一部分工作是多焦點(diǎn)聚焦透鏡的設(shè)計(jì)仿真。多焦點(diǎn)透鏡一般采用透鏡陣列方法，這種方法設(shè)計(jì)的透鏡之間的干涉現(xiàn)象比較嚴(yán)重，影響成像質(zhì)量。本文介紹了一種新型簡(jiǎn)單的類光學(xué)全息方法。分別用透鏡陣列法和類光學(xué)全息法設(shè)計(jì)了相同焦距和不同焦距兩類多焦點(diǎn)聚焦透鏡，并對(duì)兩種方法的結(jié)果進(jìn)行了分析比較。根據(jù)類光學(xué)全息方法理論，本文提出了焦點(diǎn)強(qiáng)度可控的多焦點(diǎn)透鏡的設(shè)計(jì)方法，并得到了與理論吻合的數(shù)值模擬結(jié)果，驗(yàn)證了類光學(xué)全息法設(shè)計(jì)可控焦點(diǎn)強(qiáng)度的多焦點(diǎn)透鏡的可行性。
[Abstract]:The modulation of beam wavefront by traditional optical devices is realized by the accumulation of continuous phase delay as the beam passes through the device. The supersurface is composed of a series of nanometer-sized plasma antenna elements, or monolayer. Or multilayer, very small size, the beam wavefront can be flexibly modulated in the range of 2 蟺. The shape of the supersurface antenna is different. Its performance is also very different. U-shaped aperture antenna supersurface is etched a series of U-shaped slots on the monolayer gold plate, which is simpler than other super-surface U-shaped aperture antenna supersurface structure. The thickness is only tens of nanometers. In this paper, a variety of basic optical elements are studied based on the supersurface of the U-shaped aperture antenna, including optical beam splitting, refractive index sensing, single focus focusing, polarization state detection and multi-focus lens. In this paper, the generalized Snell's law based on the supersurface is deduced, and the abnormal refraction is realized by using the U-shaped aperture antenna supersurface. The accuracy of the generalized Snell law is verified, and the multi-path beam splitting is realized by using the method of supersurface zoning design, and the theoretical relationship between the anomalous refraction angle and the ambient refractive index is deduced. The response curves of anomalous refraction angle and ambient refractive index are obtained by simulation, and the refractive index sensing function of supersurface is verified. According to the phase modulation curve of traditional cylindrical lens. A single focus lens based on the supersurface of the U-shaped aperture antenna is designed and realized, and the simulation results are obtained. Then, the influence of the polarization state of the incident light on the corresponding function is investigated. It is found that the supersurface of the U-shaped aperture antenna exhibits completely opposite phenomena to the different polarization states (left circular polarization or right circular polarization) of the incident light, that is, the function of polarization state detection can be realized by using the U-shaped aperture antenna supersurface. The most important part of this paper is the design and simulation of the multi-focus lens, which generally adopts the lens array method, and the interference between the lenses designed by this method is serious. In this paper, a new and simple optical holography method is introduced. Two kinds of multi-focus focusing lenses with the same focal length and different focal lengths are designed by using the lens array method and the optical holography method respectively. According to the theory of quasi-optical holography, the design method of multi-focal lens with controllable focal strength is proposed, and the numerical simulation results are obtained. The feasibility of designing multi-focal lens with controllable focal intensity by optical holographic method is verified.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN820

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 呂建紅;電磁超材料的電磁特性及其基于光學(xué)變換理論的應(yīng)用[D];華中科技大學(xué);2010年

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