本文選題：表面等離激元 + 金屬—介質(zhì)—金屬波導　； 參考：《桂林電子科技大學》2017年碩士論文

【摘要】：隨著當前通信技術(shù)的飛速發(fā)展,人類社會對于器件的高速化、集成度以及小型化提出了更高的要求。但由于納米級電子線路受到RC時間遲滯、熱噪聲等影響,已越來越滿足不了當今時代信息傳播的需要。而傳統(tǒng)的光子器件雖比電子器件在傳輸帶寬方面擁有不可比擬的優(yōu)勢,但由于其受到衍射極限的制約,很難在納米量級的尺度上進行高度集成。因此近些年,一種新型的基于表面等離激元(surface plasmon polaritons,SPPs)的光子器件應運而生。SPPs是一種存在于金屬/電介質(zhì)界面的特殊表面波,其最顯著的特點在于可突破衍射極限的制約,并可將電磁波能量局限在亞波長尺度范圍內(nèi),因此受到國內(nèi)外大量研究者的追捧,被認為可在新一代納米集成光路中發(fā)揮出很多潛在的應用。本論文主要研究了兩種不同類型的微納光子功能器件:金屬波導濾波器與等離子體超材料吸波器。重點針對金屬-絕緣體-金屬波導中SPPs波的傳播特性,設(shè)計了具有不同結(jié)構(gòu)的等離子體帶阻、帶通濾波器。并利用經(jīng)典的金屬/介質(zhì)/金屬三明治超材料結(jié)構(gòu),實現(xiàn)了單帶吸波器向雙帶吸波器的轉(zhuǎn)換。通過有限時域差分(FDTD)法對這些結(jié)構(gòu)進行模擬仿真,本文的主要研究成果如下:1、系統(tǒng)研究了基于對稱多齒狀金屬波導結(jié)構(gòu)中的光學濾波特性。從相位延遲的角度出發(fā),理論探討了在雙齒狀結(jié)構(gòu)中禁帶與突起產(chǎn)生的原因。提出了一種對稱多齒狀結(jié)構(gòu)的SPPs帶阻濾波器,其禁帶寬度與中心波長可以通過改變結(jié)構(gòu)的相關(guān)參數(shù)而進行調(diào)節(jié)。這些結(jié)果可能為下一代高性能納米等離子體集成光路提供有意義的應用。2、提出了一種新穎的非對稱多齒狀結(jié)構(gòu)的雙帶阻濾波器,通過改變齒的個數(shù)可以調(diào)節(jié)這兩個帶阻的寬度。此外,本文利用一階共振與二階共振的混合影響,可在兩個帶阻之間形成一個狹窄的透射峰,其半高寬最小為7.5nm,這個透射峰在波長選擇濾波器或者激光器等領(lǐng)域展現(xiàn)出了潛在的應用。并且本文也提供了一種有效的方法對這個透射峰的共振波長進行調(diào)節(jié)。3、提出了一種基于金屬/介質(zhì)/金屬超材料結(jié)構(gòu)的完美吸波器。通過改變上層被空氣條帶貫穿的金屬膜的厚度,可以將單一帶吸收轉(zhuǎn)換為雙帶吸收,同時本文證實了這兩個吸收帶的產(chǎn)生機制是完全不同的。此外,本文也探討了中間介質(zhì)層的厚度與入射光偏振角度對此吸波器性能的影響,并因此提出了一種十字形的雙帶吸波器結(jié)構(gòu)。在此結(jié)構(gòu)中,兩個吸收帶的產(chǎn)生機制是完全相同的。
[Abstract]:With the rapid development of communication technology, the high speed, integration and miniaturization of devices are demanded by human society. However, due to the influence of RC time delay and thermal noise, nanoscale electronic circuits can not meet the needs of information transmission in modern times. Although the traditional photonic devices have incomparable advantages over electronic devices in terms of transmission bandwidth, it is difficult for them to be highly integrated on nanoscale scale because of the restriction of diffraction limit. Therefore, in recent years, a new type of photonic devices based on surface plasmon polaritons (SPPs) has emerged as a special surface wave which exists at the metal / dielectric interface. Its most remarkable feature is that it can break through the restriction of diffraction limit. The electromagnetic wave energy can be confined to the sub-wavelength scale, so it has been sought after by a large number of researchers at home and abroad, and is considered to be able to play a lot of potential applications in the new generation of nanoscale integrated optical path. In this thesis, two kinds of micro-and nano-photonic functional devices: metal waveguide filter and plasma supermaterial absorber are studied. Focusing on the propagation characteristics of SPPs waves in metal-insulator-metal waveguides, plasma band-stop and band-pass filters with different structures are designed. The conversion from single band absorber to double band absorber is realized by using the classical metal / dielectric / metal sandwich supermaterial structure. These structures are simulated by finite difference time domain (FDTD) method. The main research results are as follows: 1. The characteristics of optical filtering based on pairwise multi-toothed metal waveguide structures are systematically studied. From the angle of phase delay, the causes of bandgap and protuberance in double-toothed structures are discussed theoretically. A symmetrical multi-tooth SPPs band-stop filter is proposed. The bandgap and the center wavelength can be adjusted by changing the parameters of the structure. These results may provide a meaningful application for the next generation of high performance nanoplasma integrated optical path. A novel asymmetric multi-toothed dual-band-stop filter is proposed which can adjust the width of the two band-stoppers by changing the number of teeth. In addition, a narrow transmission peak can be formed between the two band-stops by the mixed effect of first-order resonance and second-order resonance. The minimum half-maximum width is 7.5 nm. This transmission peak shows potential applications in wavelength selective filters or lasers. Furthermore, an effective method to adjust the resonant wavelength of the transmission peak is provided, and a perfect absorber based on metal / dielectric / metal supermaterial structure is proposed. By changing the thickness of the metal film which is permeated by the air strip in the upper layer, the single band absorption can be converted into the double band absorption, and it is proved that the mechanism of the two absorption bands is completely different. In addition, the influence of the thickness of the intermediate dielectric layer and the polarization angle of the incident light on the performance of the absorber is also discussed, and a cross-shaped dual-band absorber structure is proposed. In this structure, the generation mechanism of the two absorption bands is identical.
【學位授予單位】：桂林電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN713

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本文編號：1821019