本文選題：復(fù)合金屬人工微結(jié)構(gòu) + 表面等離子體��； 參考：《福建師范大學(xué)》2015年碩士論文

【摘要】：隨著信息時(shí)代的到來,需要處理的信息容量在不斷增長(zhǎng),如何更快速的處理海量信息顯得尤為重要�，F(xiàn)代的信息處理技術(shù)以集成電路為載體,其速度取決于電子回路的集成度,但是芯片的進(jìn)一步集成,將引起不可避免的量子化效應(yīng),導(dǎo)致更進(jìn)一步的信息處理技術(shù)發(fā)展遇到瓶頸。因此,利用光集成芯片來代替電子集成芯片作為信息的載體,可望更進(jìn)一步的解決信息高速傳輸?shù)膯栴}。但是,光集成電路受到衍射極限的限制,其集成程度被局限在了光波長(zhǎng)量級(jí),還達(dá)不到跟電子回路一樣高的微型化。超材料,也即亞波長(zhǎng)人工復(fù)合金屬結(jié)構(gòu),它可以通過激發(fā)表面等離激元,來實(shí)現(xiàn)各種奇異的電磁現(xiàn)象,比如負(fù)折射、超強(qiáng)透射和完美吸收等。基于超材料的光子器件可以通過控制其表面等離子波來實(shí)現(xiàn)信息的調(diào)制和傳輸。其在亞波長(zhǎng)尺度上靈活調(diào)制和傳輸電磁波的能力,使得基于超材料的光子器件有望打破衍射極限,從而使得器件具有集成度高、結(jié)構(gòu)緊湊等優(yōu)點(diǎn),為制作與現(xiàn)有電子芯片連接的光子芯片提供了可能。這對(duì)解決芯片微型化而引起的量子化效應(yīng)具有重要意義。在本論文中,基于電磁波計(jì)算仿真的有限時(shí)域差分方法,我們?cè)O(shè)計(jì)了兩種復(fù)合金屬人工微結(jié)構(gòu),此超材料結(jié)構(gòu)在滿足完美吸收的基礎(chǔ)上設(shè)計(jì)了兩類反射型的雙帶偏振濾波器件,具體的研究成果和工作如下：1.設(shè)計(jì)分析了一個(gè)并列式非對(duì)稱雙十字復(fù)合金屬結(jié)構(gòu)的雙帶可調(diào)偏振濾波器。結(jié)果顯示在兩個(gè)偏振方向上,各有兩個(gè)不同的共振吸收波長(zhǎng)。進(jìn)一步的研究分析表明：濾波器的共振吸收波長(zhǎng)與平行于偏振方向的金屬條長(zhǎng)度有關(guān),與垂直于偏振方向的金屬條長(zhǎng)度無關(guān)。因此,可以通過改變相應(yīng)的金屬條長(zhǎng)度來實(shí)現(xiàn)對(duì)濾波器的濾波波長(zhǎng)自由調(diào)節(jié)。另外,從計(jì)算的結(jié)果可以看出,濾波器在兩個(gè)偏振方向共四個(gè)濾波工作波長(zhǎng)的反射率都接近于零,這說明濾波器具有很好的濾波效果。2.設(shè)計(jì)分析了一個(gè)嵌套式非對(duì)稱雙十字復(fù)合金屬結(jié)構(gòu)的雙帶可調(diào)偏振濾波器。因?yàn)槲詹ㄩL(zhǎng)只決定于和入射光偏振平行的金屬條,因此可在非對(duì)稱十字型金屬結(jié)構(gòu)周期性陣列中,嵌套一個(gè)不同尺寸大小的非對(duì)稱十字型金屬結(jié)構(gòu)周期陣列,設(shè)計(jì)出一個(gè)新的雙帶可調(diào)的濾波器結(jié)構(gòu)。結(jié)果顯示在兩個(gè)偏振方向上,各有兩個(gè)不同的共振吸收波長(zhǎng),并且此濾波器同樣可以通過改變相應(yīng)偏振方向的矩形條長(zhǎng)度來實(shí)現(xiàn)對(duì)濾波波長(zhǎng)的自由調(diào)節(jié)。因?yàn)槭乔短捉Y(jié)構(gòu),所以器件更緊湊、尺寸更小。本文創(chuàng)新點(diǎn)：利用基于表面等離激元的超材料對(duì)電磁波具有完美吸收的特性,提出并設(shè)計(jì)了兩種不同結(jié)構(gòu)的雙帶偏振可調(diào)濾波器,實(shí)現(xiàn)了分別在Ex和Ey偏振方向上同時(shí)對(duì)兩個(gè)不同波長(zhǎng)光的共振吸收。這兩種雙帶偏振可調(diào)濾波器尺寸緊湊、工作波長(zhǎng)自由調(diào)諧、制作工藝簡(jiǎn)單,因此可以用在未來的光集成芯片中。
[Abstract]:With the arrival of the information age, the information capacity that needs to be dealt with is growing, how to deal with the mass of information more quickly is particularly important. The speed of modern information processing technology depends on the integration of electronic circuits, but the further integration of chips will lead to the inevitable quantization effect. Leading to further information processing technology development encountered bottlenecks. Therefore, the use of optical integrated chips to replace electronic integrated chips as a carrier of information is expected to further solve the problem of high-speed information transmission. However, the optical integrated circuit is limited by the diffraction limit, and its integration degree is limited to the order of light wave length, which is not as high as the miniaturization of the electronic circuit. Metamaterials, that is, subwavelength artificial composite metal structures, can realize all kinds of strange electromagnetic phenomena, such as negative refraction, super strong transmission and perfect absorption, by exciting surface isoexcitations. Photonic devices based on metamaterials can modulate and transmit information by controlling their surface plasma waves. Its ability to modulate and transmit electromagnetic wave flexibly at sub-wavelength scale makes it possible to break the diffraction limit of photonic devices based on metamaterials, which makes the devices have the advantages of high integration and compact structure. It is possible to fabricate photonic chips connected to existing electronic chips. This is of great significance to solve the quantization effect caused by chip miniaturization. In this thesis, two kinds of composite metal artificial microstructures are designed based on the finite difference time-domain (FDTD) method of electromagnetic wave simulation. Two kinds of reflective dual-band polarization filters are designed on the basis of perfect absorption. The concrete research results and work are as follows: 1. A dual band tunable polarization filter with a parallel asymmetric double cross composite metal structure is designed and analyzed. The results show that there are two different resonant absorption wavelengths in two polarization directions. Further analysis shows that the resonant absorption wavelength of the filter is related to the length of the metal strip parallel to the polarization direction and independent of the length of the metal strip perpendicular to the polarization direction. Therefore, the filter wavelength can be adjusted freely by changing the length of the metal strip. In addition, it can be seen from the calculation results that the reflectivity of four filter wavelengths in two polarization directions is close to zero, which shows that the filter has a good filtering effect. 2. A double band tunable polarization filter with a nested asymmetric double cross composite metal structure is designed and analyzed. Because the absorption wavelength is determined only by the metal strip parallel to the polarization of the incident light, it is possible to nest an asymmetric cross-metal periodic array of different sizes in a periodic array of asymmetric cross metal structures. A new dual band tunable filter structure is designed. The results show that there are two different resonant absorption wavelengths in each polarization direction, and the filter can adjust the filter wavelength freely by changing the length of the rectangular strip in the corresponding polarization direction. Because of the nested structure, the device is more compact and smaller. In this paper, two kinds of dual-band polarization tunable filters with different structures are proposed and designed. The resonant absorption of two different wavelengths of light in the polarization direction of Ex and Ey is realized respectively. These two kinds of dual-band polarization tunable filters are compact in size, freely tunable in operating wavelength and simple in fabrication process, so they can be used in future optical integrated chips.
【學(xué)位授予單位】：福建師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN713

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