【摘要】：近年來(lái),隨著集成光學(xué)和微納加工技術(shù)的不斷發(fā)展,表面等離激元技術(shù)得到了研究者的廣泛重視和關(guān)注。表面等離激元(Surface PlasmonPolaritons,簡(jiǎn)記為SPPs)是入射光波與金屬表面的自由電子發(fā)生作用從而形成的一種電磁波模式,它憑借表面局域特性、波長(zhǎng)短和超強(qiáng)透射的優(yōu)勢(shì),為解決集成光學(xué)中突破衍射極限問(wèn)題開(kāi)辟了重要途徑。在此背景下,本文設(shè)計(jì)并提出了兩種基于表面等離激元干涉的金屬微納結(jié)構(gòu),并且通過(guò)模擬仿真探究了兩種結(jié)構(gòu)中光波的干涉效應(yīng)和工作機(jī)理,具體包括:設(shè)計(jì)提出了一個(gè)基于非對(duì)稱(chēng)圓環(huán)結(jié)構(gòu)的干涉型表面等離激元傳感器,由一個(gè)非對(duì)稱(chēng)圓環(huán)-納米小孔的金屬結(jié)構(gòu)組成,半圓環(huán)形凹槽分別對(duì)應(yīng)兩個(gè)不同臂長(zhǎng)的干涉臂,從而構(gòu)成雙干涉臂、三光束干涉的傳感結(jié)構(gòu)。通過(guò)仿真得到不同臂長(zhǎng)、凹槽數(shù)量的結(jié)構(gòu)參數(shù)下干涉譜線(xiàn)變化的特性,并且探究了該結(jié)構(gòu)的折射率傳感能力。理論計(jì)算結(jié)果和仿真結(jié)果的基本吻合驗(yàn)證了非對(duì)稱(chēng)圓環(huán)中干涉效應(yīng)和傳感工作原理。該傳感器結(jié)構(gòu)簡(jiǎn)單、緊湊、可控,具有較高的對(duì)比度和較窄的線(xiàn)寬。在非對(duì)稱(chēng)圓環(huán)結(jié)構(gòu)的基礎(chǔ)上,設(shè)計(jì)了一種基于馬增干涉的表面等離激元傳感器,由一個(gè)金屬-介質(zhì)-金屬多層膜上的半環(huán)狹縫-小孔結(jié)構(gòu)構(gòu)成。仿真計(jì)算了該結(jié)構(gòu)的干涉譜線(xiàn),探究了 SPP傳播路徑長(zhǎng)度和中心層厚度對(duì)干涉譜的調(diào)控和影響原理。仿真結(jié)果顯示了該結(jié)構(gòu)的透過(guò)譜呈現(xiàn)寬帶范圍內(nèi)的振蕩行為,對(duì)應(yīng)干涉相長(zhǎng)和相消,驗(yàn)證了干涉效應(yīng)的工作機(jī)理�；谶@樣的工作原理,繼續(xù)探究并驗(yàn)證了該結(jié)構(gòu)的折射率傳感性能。另外,由于此結(jié)構(gòu)的入射光在結(jié)構(gòu)的背面入射,因此可以規(guī)避入射光對(duì)干涉結(jié)果的影響。同樣,仿真結(jié)果顯示了該結(jié)構(gòu)在簡(jiǎn)單經(jīng)濟(jì),高效緊湊的生化傳感領(lǐng)域有著一定的參考價(jià)值和潛在應(yīng)用。
[Abstract]:In recent years, with the continuous development of integrated optics and micro-nano fabrication technology, surface isophosphorization technology has received extensive attention and attention of researchers. (Surface PlasmonPolaritons,) is a kind of electromagnetic wave mode formed by the interaction of incident light wave with free electron on metal surface. It depends on the advantages of local characteristic of surface, short wavelength and super strong transmission. It opens up an important way to solve the problem of breaking the diffraction limit in integrated optics. In this context, two kinds of metal micro / nano structures based on surface isopultionic interference are designed and proposed, and the interference effect and working mechanism of the two structures are studied by simulation. The main contents are as follows: an interferometric surface isolator sensor based on asymmetric ring structure is proposed. The sensor is composed of a metal structure with an asymmetric ring and a nanometer hole. The semicircular ring groove corresponds to two interference arms with different arm lengths respectively. Thus, the sensing structure of double interference arm and three beam interference is formed. The characteristics of interference spectral line variation under different arm length and number of grooves are obtained by simulation, and the refractive index sensing ability of the structure is explored. The theoretical results are in good agreement with the simulation results. The interference effect and sensing principle in the asymmetric ring are verified. The sensor has simple structure, compact, controllable, high contrast and narrow linewidth. Based on the asymmetric ring structure, a kind of surface isopultiplexer sensor based on the Mazen interference is designed, which is composed of a half-ring slit and small hole structure on a metal-dielectric metal multilayer film. The interference spectrum line of the structure is simulated and the influence principle of the length of the SPP propagation path and the thickness of the center layer on the interference spectrum is discussed. The simulation results show that the transmission spectrum of the structure exhibits oscillatory behavior in the wideband range corresponding to the length and cancellation of the interference phase and verifies the working mechanism of the interference effect. Based on this principle, the refractive index sensing performance of the structure is investigated and verified. In addition, because the incident light of the structure is incident on the back of the structure, the influence of the incident light on the interference result can be avoided. The simulation results show that the structure has a certain reference value and potential application in the field of simple, economical, efficient and compact biochemical sensing.
【學(xué)位授予單位】：南京師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TP212

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相關(guān)博士學(xué)位論文 前1條

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本文編號(hào)：2325037