本文選題：耦合模理論 + 時域有限差分法�。� 參考：《長春理工大學》2017年碩士論文

【摘要】：表面等離子激元是電磁場與金屬表面?zhèn)鲗?dǎo)電子相互耦合所產(chǎn)生的傳導(dǎo)電子集體共振的結(jié)果。表面等離子導(dǎo)模與表面等離子共振導(dǎo)模這兩類模式都是由金屬-介質(zhì)界面支撐。表面等離子導(dǎo)模在金屬-介質(zhì)界面?zhèn)鞑ヅc外界電磁場不存在耦合,即沒有輻射損耗;表面等離子共振導(dǎo)模的電磁場也是被限制在金屬-介質(zhì)界面?zhèn)鞑?它能夠利用光柵、棱鏡、近場來激發(fā),不同于表面等離子導(dǎo)模,表面等離子共振導(dǎo)模能夠與外界電磁場進行強烈的相互耦合。利用金屬光柵結(jié)構(gòu)激發(fā)表面等離子導(dǎo)模與表面等離子共振導(dǎo)模得到了廣泛研究。采用時域有限差分法與耦合模理論,本文研究了介質(zhì)覆蓋金屬光柵表面等離子混合模式的光學共振特性。研究結(jié)果表明,在所研究的結(jié)構(gòu)中,覆蓋介質(zhì)支撐的混合表面模式與金屬光柵所支撐的表面等離子模式相互作用引起抗交叉效應(yīng);利用耦合模理論,還對此系統(tǒng)的反射特性進行了建模研究,得出了減小吸收的條件。此耦合系統(tǒng)的所有光學特性都采用了時域有限差分法進行驗證,理論結(jié)果與數(shù)值模擬結(jié)果一致。這個研究可以應(yīng)用在傳感器上,在金屬光柵上覆蓋上一層介質(zhì)能夠防止其被氧化,極大地提高了傳感器的性能與壽命。
[Abstract]:Surface plasmon is the result of collective resonance of conducting electrons produced by the interaction of electromagnetic field and conducting electrons on metal surface. Both surface plasmon modes and surface plasmon resonance modes are supported by the metal-dielectric interface. There is no coupling between the surface plasma conduction mode and the external electromagnetic field, that is, there is no radiation loss, and the electromagnetic field of the surface plasma resonance conduction mode is also confined to the metal-medium interface. It can use grating, prism, Different from the surface plasmon conduction mode, the surface plasmon resonance conduction mode can be strongly coupled with the external electromagnetic field. The surface plasmon conduction mode and the surface plasmon resonance conduction mode excited by metal grating structure have been widely studied. Using the finite difference time-domain method and coupled mode theory, the optical resonance characteristics of plasma mixing mode on the surface of dielectric coated metal gratings are studied in this paper. The results show that, in the studied structure, the interaction between the mixed surface mode supported by the covering medium and the surface plasma mode supported by the metal grating results in anti-cross effect, and the coupling mode theory is used. The reflection characteristics of the system are modeled and the conditions for reducing absorption are obtained. All the optical properties of the coupled system are verified by the finite-difference time-domain method, and the theoretical results are in agreement with the numerical simulation results. This study can be applied to the sensor. Coating a layer of dielectric on the metal grating can prevent it from being oxidized, which greatly improves the performance and lifetime of the sensor.
【學位授予單位】：長春理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN25

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本文編號：1990791