本文選題：信息光學(xué) + 表面光學(xué)��； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：光學(xué)超表面由于亞波長的特征尺寸、自然材料無法實(shí)現(xiàn)的傳輸特性,其概念一經(jīng)提出,就迅速成為光學(xué)集成、平面光學(xué)器件研究領(lǐng)域的熱門。而基于全電介質(zhì)材料的光學(xué)超表面的提出,由于避免了金屬材料的歐姆損耗,將透射型超表面拓展到了可見光和近紅外波段。超表面設(shè)計(jì)的關(guān)鍵,在于結(jié)構(gòu)單元的選擇。目前大部分電介質(zhì)超表面結(jié)構(gòu)單元的設(shè)計(jì)都是基于米散射理論或幾何相位。我們創(chuàng)新性地引入亞波長硅波導(dǎo)作為超表面的結(jié)構(gòu)單元,通過理論計(jì)算和數(shù)值模擬研究1550 nm波長下對透射光場的波前調(diào)控。我們首先研究了基于二維亞波長硅波導(dǎo)陣列的電介質(zhì)超表面。我們分析了用二維亞波長硅波導(dǎo)做超表面結(jié)構(gòu)單元的可行性,實(shí)現(xiàn)了垂直入射線偏振平面波的偏折和近衍射極限會(huì)聚,并巧妙地將這二者結(jié)合實(shí)現(xiàn)了光束的偏折會(huì)聚。此外,我們著重考察了二元光學(xué)的典型器件——達(dá)曼光柵,并在該部分探討了一維達(dá)曼光柵的設(shè)計(jì),在遠(yuǎn)場得到了1×5衍射點(diǎn)陣。之后我們將二維結(jié)構(gòu)拓展到三維,研究了基于三維亞波長硅波導(dǎo)(即矩形波導(dǎo))陣列的電介質(zhì)超表面。我們詳細(xì)討論了三維亞波長硅波導(dǎo)的光學(xué)傳輸和共振特性,并論證了用三維亞波長硅波導(dǎo)做超表面結(jié)構(gòu)單元的可行性。之后,我們設(shè)計(jì)了將垂直入射線偏振平面波轉(zhuǎn)換為拓?fù)浜蔀?的渦旋光束的超表面,并考察了其與平面波的干涉情況。最后,我們設(shè)計(jì)了在遠(yuǎn)場產(chǎn)生5×5等光強(qiáng)衍射點(diǎn)陣的偏振獨(dú)立達(dá)曼光柵,并證明了該達(dá)曼光柵具有寬帶響應(yīng)和對制造誤差具有魯棒性的特點(diǎn)。
[Abstract]:Due to the characteristic size of subwavelength, the optical supersurface can not be realized by the transmission characteristics of natural materials. As soon as the concept of optical supersurface is put forward, it has become a hot topic in the field of optical integration and planar optical devices. Because the ohmic loss of metal material is avoided, the transmission supersurface is extended to visible light and near infrared band due to the proposed optical supersurface based on all-dielectric material. The key of supersurface design lies in the selection of structural elements. At present, the design of most dielectric supersurface elements is based on the theory of meter scattering or geometric phase. We creatively introduce subwavelength silicon waveguide as the structural element of supersurface, and study the wavefront control of transmitted light field at 1550 nm by theoretical calculation and numerical simulation. We first study the dielectric supersurface based on the Si-waveguide array. We analyze the feasibility of using the two-dimensional wavelength silicon waveguide as the supersurface structure unit, and realize the deflection and near diffraction limit convergence of the plane wave polarized by perpendicular ray, and skillfully combine the two to realize the beam deflection and convergence. In addition, we focus on the Darman grating, a typical binary optical device, and discuss the design of the one-dimensional Daman grating in this part. The 1 脳 5 diffraction lattice is obtained in the far field. Then we extend the 2D structure to 3D structure and study the dielectric supersurface based on 3D subwavelength silicon waveguide (rectangular waveguide) array. We discuss in detail the optical propagation and resonance characteristics of the SWA waveguides and demonstrate the feasibility of using them as supersurface structural elements. Then we design the supersurface of the vertically-polarized plane wave to a vortex beam with topological charge of 1 and investigate its interference with the plane wave. Finally, we design a polarization-independent Darman grating which produces 5 脳 5 equal-intensity diffraction lattice in the far field, and prove that the Darman grating has the characteristics of wideband response and robustness to manufacturing errors.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN25

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本文編號：2027804