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、信息處理和激光科學領域都有著廣泛的應用。近年來人工微結(jié)構(gòu)介質(zhì)被廣泛研究,它可以人為的設計結(jié)構(gòu)并呈現(xiàn)出超常的物理特性。針對傳統(tǒng)空間濾波器存在的體積大、不能聚焦近場分量等不足,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計,同時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擴展絕對禁帶的光子晶體結(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,該光子晶體的絕對禁帶寬度相應地增加;調(diào)節(jié)兩種磁性材料的物理厚度,其絕對禁帶中心也會隨之調(diào)整;將兩個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到1.41以上。第二,利用超常介質(zhì)和準周期結(jié)構(gòu)分別設計了小角度的低通空間濾波器,并探索了其相應的結(jié)構(gòu)參數(shù)對其角域帶寬的影響。研究發(fā)現(xiàn)利用超常介質(zhì)設計得到的小角度低通空間濾波器是偏振無關(guān)的,角域帶寬不受偏振態(tài)的影響;而利用準周期結(jié)構(gòu)設計的小角度低通空間濾波器的角域帶寬可以實現(xiàn)“粗調(diào)”和“精調(diào)”,更有可能應用于高功率激光系統(tǒng)中。第三,提出了一種新的波導模式控制方法,即將薄膜型空間濾波器嵌入到多模波導中。研究結(jié)果表明,只有當波導模式對應的模角在空間濾波器的角域帶寬以內(nèi)時,該波導模式才被允許通過濾波器。從而可以通過調(diào)節(jié)空間濾波器的角域帶寬來選取所需要的波導模式,達到控制波導模式的目的。該方法相對簡單、成本低、高階模抑制效果好。最后,從理論和實驗角度系統(tǒng)研究了利用動力學相位和幾何相位對光自旋霍爾效應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,而動力學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驗系統(tǒng),該系統(tǒng)證明了基于動力學相位和幾何相位操控光自旋霍爾效應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.
【學位授予單位】：湖南理工學院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN713

【參考文獻】

相關(guān)期刊論文 前10條

1 董澤東;劉友文;;斐波納契數(shù)列準周期微結(jié)構(gòu)光吸收特性[J];光學學報;2016年06期

2 劉杰;鐵生年;盧輝東;;多信道二維光子晶體濾波器[J];光學精密工程;2016年05期

3 鄭光威;楚興春;鄭秋容;;非聚焦型光束空間低通濾波技術(shù)研究進展[J];激光與光電子學進展;2016年05期

4 滕晨晨;周雯;莊煜陽;陳鶴鳴;;基于磁光子晶體的低損耗窄帶THz濾波器[J];物理學報;2016年02期

5 柯杰;張軍勇;;斐波那契光子篩的聚焦成像特性[J];光學學報;2015年09期

6 康永強;高鵬;劉紅梅;張淳民;;含各向異性左手材料的一維Thue-Mores準周期結(jié)構(gòu)的反射帶隙[J];光子學報;2015年03期

7 李星;周新星;羅海陸;;納米金屬薄膜中光子自旋霍爾效應的最佳弱測量[J];光學學報;2014年07期

8 羅朝明;陳世禎;凌曉輝;張進;羅海陸;;高階邦加球上柱矢量光束的變換[J];物理學報;2014年15期

9 張進;羅朝明;羅海陸;文雙春;;利用軌道角動量操控光子自旋霍爾效應中的非對稱自旋分裂[J];光學學報;2013年11期

10 劉曉;周駿;朱本強;金理;;基于對稱廣義Fibonacci光子晶體結(jié)構(gòu)的電光可調(diào)諧濾波器(英文)[J];光子學報;2011年11期

相關(guān)博士學位論文 前1條

1 羅朝明;周期性人工微結(jié)構(gòu)介質(zhì)的空間濾波特性研究[D];湖南大學;2011年

相關(guān)碩士學位論文 前1條

1 劉曉;一維廣義Fibonacci序列光子晶體結(jié)構(gòu)的光學傳輸特性研究[D];寧波大學;2011年

，

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