本文選題：人工微結(jié)構(gòu)介質(zhì) + 傳輸矩陣法　； 參考：《湖南理工學(xué)院》2017年碩士論文

【摘要】：空間濾波器在電磁頻譜中的圖像增強(qiáng)、信息處理和激光科學(xué)領(lǐng)域都有著廣泛的應(yīng)用。近年來(lái)人工微結(jié)構(gòu)介質(zhì)被廣泛研究,它可以人為的設(shè)計(jì)結(jié)構(gòu)并呈現(xiàn)出超常的物理特性。針對(duì)傳統(tǒng)空間濾波器存在的體積大、不能聚焦近場(chǎng)分量等不足,本文利用傳輸矩陣法等數(shù)值算法研究了人工微結(jié)構(gòu)介質(zhì)的空間濾波特性,探索即插即用(非聚焦型)的新型空間濾波器的設(shè)計(jì),同時(shí)還研究了高斯光束中自旋分裂的調(diào)控規(guī)律,并取得了一定的研究成果:第一,提出了一種利用磁性材料來(lái)擴(kuò)展絕對(duì)禁帶的光子晶體結(jié)構(gòu),并探索研究了各結(jié)構(gòu)參數(shù)對(duì)禁帶寬度的影響。研究結(jié)果表明,合適地調(diào)節(jié)兩種磁性材料的參數(shù),增加兩者波阻抗的差值,該光子晶體的絕對(duì)禁帶寬度相應(yīng)地增加;調(diào)節(jié)兩種磁性材料的物理厚度,其絕對(duì)禁帶中心也會(huì)隨之調(diào)整;將兩個(gè)一維磁性光子晶體組成異質(zhì)結(jié)構(gòu),其第一禁帶寬度與禁帶中心之間的比值可達(dá)到1.41以上。第二,利用超常介質(zhì)和準(zhǔn)周期結(jié)構(gòu)分別設(shè)計(jì)了小角度的低通空間濾波器,并探索了其相應(yīng)的結(jié)構(gòu)參數(shù)對(duì)其角域帶寬的影響。研究發(fā)現(xiàn)利用超常介質(zhì)設(shè)計(jì)得到的小角度低通空間濾波器是偏振無(wú)關(guān)的,角域帶寬不受偏振態(tài)的影響;而利用準(zhǔn)周期結(jié)構(gòu)設(shè)計(jì)的小角度低通空間濾波器的角域帶寬可以實(shí)現(xiàn)“粗調(diào)”和“精調(diào)”,更有可能應(yīng)用于高功率激光系統(tǒng)中。第三,提出了一種新的波導(dǎo)模式控制方法,即將薄膜型空間濾波器嵌入到多模波導(dǎo)中。研究結(jié)果表明,只有當(dāng)波導(dǎo)模式對(duì)應(yīng)的模角在空間濾波器的角域帶寬以內(nèi)時(shí),該波導(dǎo)模式才被允許通過(guò)濾波器。從而可以通過(guò)調(diào)節(jié)空間濾波器的角域帶寬來(lái)選取所需要的波導(dǎo)模式,達(dá)到控制波導(dǎo)模式的目的。該方法相對(duì)簡(jiǎn)單、成本低、高階模抑制效果好。最后,從理論和實(shí)驗(yàn)角度系統(tǒng)研究了利用動(dòng)力學(xué)相位和幾何相位對(duì)光自旋霍爾效應(yīng)中的自旋分裂的操控。理論研究發(fā)現(xiàn),幾何相位控制著光束的自旋分裂大小和方向,而動(dòng)力學(xué)相位操控著光束的整體平移�；诳臻g光調(diào)制器和超表面搭建了一套實(shí)驗(yàn)系統(tǒng),該系統(tǒng)證明了基于動(dòng)力學(xué)相位和幾何相位操控光自旋霍爾效應(yīng)中自旋分裂方法的可行性。
[Abstract]:Spatial filters are widely used in the fields of image enhancement, information processing and laser science. In recent years, artificial microstructural media has been widely studied. It can design artificial structures and exhibit extraordinary physical properties. In view of the disadvantages of the traditional spatial filter, such as the large volume and the inability to focus on the near-field components, the spatial filtering characteristics of artificial microstructured media are studied by using the transfer matrix method and other numerical algorithms. This paper explores the design of a new spatial filter with plug and play (non-focusing type). At the same time, the regulation of spin splitting in Gao Si beam is studied, and some research results are obtained: first, A photonic crystal structure using magnetic materials to extend the absolute band gap is proposed and the influence of structural parameters on the band gap is investigated. The results show that the absolute band gap of the photonic crystal increases correspondingly by adjusting the parameters of the two kinds of magnetic materials and increasing the difference between the two impedance values, and the physical thickness of the two kinds of magnetic materials is adjusted. The ratio between the first band gap width and the band gap center of the heterostructure formed by two one-dimensional magnetic photonic crystals is above 1.41. Secondly, the low-pass space filter with small angle is designed by using supernormal medium and quasi-periodic structure, and the influence of the corresponding structure parameters on its angular bandwidth is explored. It is found that the small angle low-pass space filter designed by using the supernormal medium is polarization independent and the angular bandwidth is not affected by the polarization state. The angular bandwidth of the low-pass space filter with small angle designed with quasi-periodic structure can realize "coarse tuning" and "fine tuning", which is more likely to be used in high-power laser systems. Thirdly, a new waveguide mode control method is proposed, in which the thin-film spatial filter is embedded into the multimode waveguide. The results show that the waveguide mode is allowed to pass through the filter only if the corresponding mode angle of the waveguide mode is within the angular bandwidth of the spatial filter. Thus, the desired waveguide mode can be selected by adjusting the angular bandwidth of the spatial filter, and the waveguide mode can be controlled. This method is relatively simple, low cost and good high order mode suppression effect. Finally, the manipulation of spin splitting in the optical spin Hall effect by using the dynamic phase and the geometric phase is studied theoretically and experimentally. It is found that the geometric phase controls the spin-splitting size and direction of the beam, while the dynamic phase controls the overall translation of the beam. An experimental system based on spatial light modulator and supersurface is constructed. The system proves the feasibility of the spin splitting method based on dynamic phase and geometric phase to manipulate the spin Hall effect.
【學(xué)位授予單位】：湖南理工學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN713

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