本文選題：表面等離子體波導(dǎo) + 有限元方法��； 參考：《安徽大學(xué)》2017年碩士論文

【摘要】：近年來,隨著科學(xué)技術(shù)的不斷進(jìn)步,表面等離子體在光子學(xué)研究中被廣泛應(yīng)用,受到了許多領(lǐng)域研究者的關(guān)注。表面等離子體是一種電磁表面波,在表面處場(chǎng)強(qiáng)最強(qiáng),能夠被電子或者光子激發(fā)。表面等離子體激元的分布深度可小于波長(zhǎng)量級(jí),可用于亞波長(zhǎng)量級(jí)的光電子集成器件的制作。但是表面等離子體激元傳輸時(shí)有較大損耗,在限制了其應(yīng)用。表面等離子體激元能夠?qū)崿F(xiàn)納米尺度的光信息傳輸與處理。表面等離子體激元的獨(dú)特特性,使得它在高靈敏生物檢測(cè)、傳感和新型光源等領(lǐng)域獲得了廣泛的應(yīng)用。本文利用表面等離子體激元的性質(zhì),對(duì)金屬納米線的光傳輸特性進(jìn)行分析,內(nèi)容如下:(1)對(duì)金屬圓柱結(jié)構(gòu)的表面等離子體波導(dǎo)的傳輸特性進(jìn)行研究,分析了在固定波長(zhǎng)1550nm下,波導(dǎo)幾何參數(shù)和金屬材料(Ag和Au)對(duì)傳輸特性的影響。結(jié)果表明,此波導(dǎo)結(jié)構(gòu)的能流密度主要集中分布在金屬柱的圓周處,且越靠近金屬圓柱,其能流密度越大,銀棒的傳輸特性更有優(yōu)勢(shì)。(2)接著對(duì)有基底的金屬圓柱的表面等離子體波導(dǎo)的傳輸特性進(jìn)行研究,通過改變金屬圓柱的直徑和圓柱與基底的距離,分析此波導(dǎo)沿縱向的能流密度、有效折射率、傳播長(zhǎng)度和模式面積。分析比較不同基底材料(硅和鍺)的傳輸特性,得到鍺基底結(jié)構(gòu)更具有優(yōu)勢(shì)。(3)設(shè)計(jì)了一種高折射率材料為基底的金屬雙橢圓表面等離子體波導(dǎo),利用有限元方法對(duì)這種波導(dǎo)支持的基模的能流密度分布、有效折射率、傳播長(zhǎng)度和有效面積與幾何參數(shù)和結(jié)構(gòu)的依賴關(guān)系進(jìn)行了分析。從能流密度分布看出,能量主要集中分布在兩個(gè)金屬橢圓柱之間的中心區(qū)域,在金屬與鍺基底之間和基底與基底之間也都有能量存在。通過調(diào)節(jié)兩個(gè)橢圓的中心距離和它們的兩個(gè)半軸的大小,對(duì)此波導(dǎo)的傳輸特性的分析。(4)為了更進(jìn)一步的研究表面等離子體波導(dǎo),提出了一種新的波導(dǎo)結(jié)構(gòu),此結(jié)構(gòu)是在金屬環(huán)中嵌入兩個(gè)介質(zhì)塊,通過調(diào)節(jié)間隙寬度和介質(zhì)寬度來分析傳輸特性。該結(jié)構(gòu)能夠廣泛應(yīng)用于光子集成電路和傳感器領(lǐng)域�？偟膩碚f,表面等離子體波導(dǎo)的傳輸特性可以通過改變幾何參數(shù)、通信波長(zhǎng)等來分析。本文主要研究在工作波長(zhǎng)固定的條件下,不同結(jié)構(gòu)的表面等離子體波導(dǎo),通過調(diào)節(jié)幾何結(jié)構(gòu)的參數(shù)來分析其傳輸特性,如有效折射率、傳播長(zhǎng)度、模面積等性質(zhì),這些研究為未來光通信和光傳感提供理論依據(jù)。
[Abstract]:In recent years, with the development of science and technology, surface plasma has been widely used in photonics, and has been paid attention to by many researchers.Surface plasma is an electromagnetic surface wave. It is the strongest field on the surface and can be excited by electrons or photons.The depth of surface plasmon distribution can be less than that of wavelength, which can be used to fabricate subwavelength optoelectronic integrated devices.However, the surface plasmon transmission has a large loss, which limits its application.Surface plasmon can transmit and process optical information at nanometer scale.Because of its unique characteristics, surface plasmon has been widely used in high sensitive biological detection, sensing and new light sources.In this paper, the optical propagation characteristics of metal nanowires are analyzed by using the properties of surface plasmon. The transmission characteristics of metal cylindrical surface plasmon waveguides are studied as follows. At fixed wavelength 1550nm, the propagation characteristics of surface plasmon waveguides are analyzed.The influence of waveguide geometry parameters and metal materials such as Ag and Au) on transmission characteristics.The results show that the energy flow density of the waveguide structure is mainly distributed in the circumference of the metal column, and the closer it is to the metal cylinder, the higher the energy flow density is.(2) the propagation characteristics of the surface plasma waveguide of a metal cylinder with a substrate are studied. By changing the diameter of the metal cylinder and the distance between the cylinder and the substrate, the longitudinal energy flow density of the waveguide is analyzed.Effective refractive index, propagation length and mode area.By analyzing and comparing the transport properties of different substrate materials (Si and GE), it is found that GE substrate structure has more advantages. A metal double ellipse surface plasma waveguide with high refractive index material is designed.The dependence of the energy flux density, the effective refractive index, the propagation length and the effective area on the geometric parameters and the structure of the fundamental modes supported by the waveguide is analyzed by using the finite element method.It can be seen from the energy flux density distribution that the energy is mainly distributed in the central region between the two metal elliptic columns and between the metal and germanium substrates as well as between the metal and germanium substrates.By adjusting the central distance of two ellipses and the size of their two half-axes, the propagation characteristics of this waveguide are analyzed. (4) in order to further study the surface plasma waveguide, a new waveguide structure is proposed.Two dielectric blocks are embedded in the metal ring and the transmission characteristics are analyzed by adjusting the width of the gap and the width of the medium.The structure can be widely used in the field of photonic integrated circuits and sensors.In general, the propagation characteristics of surface plasma waveguides can be analyzed by changing geometric parameters and communication wavelengths.In this paper, the propagation characteristics of surface plasma waveguides with different structures, such as effective refractive index, propagation length, mode area and so on, are analyzed by adjusting the geometric structure parameters under the condition of fixed working wavelength.These studies provide theoretical basis for future optical communication and optical sensing.
【學(xué)位授予單位】：安徽大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O485

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