本文選題：人工表面等離子體 + 周期結(jié)構(gòu)�。� 參考：《桂林電子科技大學(xué)》2015年碩士論文

【摘要】：人工表面等離子體激元(SSPPs)是光波段中表面等離子體激元在微波和太赫茲波段的一個重要拓展,它本質(zhì)上是一種被金屬表面周期性凹槽或者孔約束和傳播的表面電磁模式。由于SSPPs諸多的優(yōu)良特性,近些年引起了許多國內(nèi)外學(xué)者的關(guān)注�；诖�,本文對超薄型人工表面等離子體結(jié)構(gòu)進行了深入研究。首先我們對超薄金屬單光柵作為SSPPs波導(dǎo)進行了分析,發(fā)現(xiàn)單光柵在引導(dǎo)SSPPs傳輸時傳輸損耗較大,進而雙光柵結(jié)構(gòu)的SSPPs波導(dǎo)被提出用來解決該問題。本文分別從色散關(guān)系、傳播特性、模式分布的角度對雙光柵結(jié)構(gòu)作為SSPPs波導(dǎo)進行了深入的研究。結(jié)果表明,光柵的凹槽深度與基板的介電常數(shù)對SSPPs波的截止頻率影響較為明顯,并且研究發(fā)現(xiàn)雙光柵結(jié)構(gòu)所支持的電磁模式主模為奇模SSPPs波。隨后,本文對復(fù)合周期結(jié)構(gòu)的超薄金屬光柵進行了研究和分析,發(fā)現(xiàn)復(fù)合周期光柵結(jié)構(gòu)作為SSPPs波導(dǎo)時能夠支持雙波段的SSPPs波傳輸�；谄婺SPPs波的電場分布特性,文中設(shè)計了兩種用于雙光柵的SSPPs波激勵裝置:一種微帶線饋電的SSPPs波激勵裝置;一種共面波導(dǎo)饋電的SSPPs波激勵裝置。實驗測試結(jié)果證實了該激勵裝置能夠有效地激勵起雙光柵里的奇模SSPPs波。兩種激勵裝置各具有不同特點,分別適用于不同場合。結(jié)合雙光柵和激勵裝置,本文設(shè)計了兩種直波導(dǎo)結(jié)構(gòu)的SSPPs濾波器,一種900彎曲結(jié)構(gòu)的濾波器,一種復(fù)合周期雙光柵的雙頻帶SSPPs濾波器。最后介紹了前人研究的H型人工表面等離子體結(jié)構(gòu),并在此基礎(chǔ)上結(jié)合復(fù)合H型SSPPs結(jié)構(gòu)設(shè)計了一款SSPPs功分器。實驗測試結(jié)果證明了這幾種功能器件都具有優(yōu)秀的性能。這為SSPPs從理論研究走向?qū)嶋H應(yīng)用奠定了一定的基礎(chǔ)。
[Abstract]:Artificial surface plasmon excitation (SSPPs) is an important extension of surface plasmon in the microwave and terahertz bands in the light wave band. It is essentially a surface electromagnetic mode confined and propagated by periodic grooves or holes on the surface of metal. Due to the excellent characteristics of SSPPs, many scholars at home and abroad have paid close attention to them in recent years. Based on this, the structure of ultra thin artificial surface plasma is studied in detail. First, we analyze the ultra-thin metal single grating as the SSPPs waveguide, and find that the single grating has a high transmission loss when guiding the SSPPs, and then the double-grating SSPPs waveguide is proposed to solve this problem. In this paper, the structure of double gratings as SSPPs waveguides is studied in terms of dispersion relation, propagation characteristics and mode distribution. The results show that the depth of grooves and the dielectric constant of the substrate have obvious effects on the cut-off frequency of SSPPs waves, and it is found that the main mode of electromagnetic modes supported by the double grating structure is singularly mode SSPPs waves. Then, the ultra-thin metal grating with composite periodic structure is studied and analyzed. It is found that the composite periodic grating structure can support the propagation of SSPPs waves in two bands when it is used as a SSPPs waveguide. Based on the electric field characteristics of odd-mode SSPPs waves, two kinds of SSPPs wave exciters for double gratings are designed: a microstrip line-fed SSPPs wave excitation device and a coplanar waveguide SSPPs wave excitation device. The experimental results show that the exciter can excite odd-mode SSPPs waves in double gratings effectively. The two kinds of excitation devices have different characteristics and are suitable for different occasions. In this paper, two kinds of SSPPs filters with straight waveguide structure, one filter with 900 bending structure and one kind of double frequency band SSPPs filter with compound periodic double gratings are designed by combining double gratings and exciters. Finally, the structure of H-type artificial surface plasma is introduced, and a SSPPs power divider is designed based on the composite H-type SSPPs structure. The experimental results show that these functional devices have excellent performance. This lays a foundation for SSPPs from theoretical research to practical application.
【學(xué)位授予單位】：桂林電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN713;TN25

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