本論文提出非對稱U型奈米結構的金屬超穎介面的光學分析與奈米製作以及偵測應用。根據光學矩陣分析理論與Stokes parameter的光學分析理論，利用嚴格耦合分析法針對非對稱U型奈米結構進行模擬，探討在各種不同條件下，x/y線性偏振入射的方位旋轉角以及橢偏率變化。由於其強烈的手性光學響應，在紅外光波段產生顯著的手性光學訊號，並在x/y線性偏振入射時，分別具有右/左圓的偏振變化，藉此達到偏振轉換的研究目的。
利用奈米轉印技術成功製作出不對稱U型金超穎介面，配合工作模具的製程與清洗，達到低成本、快速、可重複使用的生產訴求。透過自行架設Stokes parameter光學量測系統獲取Stokes parameter，經由公式換算獲得方位旋轉角以及橢偏率。利用x線性偏振入射可得到橢偏率sin2η為0.548的右圓偏振變化；y線性偏振入射得到橢偏率sin2η為-0.987的左圓偏振變化，分析模擬結果與量測結果確認具有一致性，並探討製程上的影響因素。
手性分子存在不同的旋性，在藥學上分別會有不同的藥性與毒性，因此手性分子的偵測與分析對於製藥的過程扮演相當重要的角色。近年來有其他研究指出，利用手性超穎材料可作為分子旋性的感測系統。本研究藉由結構存在正交旋性變化的特性，透過正向入射與背向入射的方式，分別利用x/y線性偏振入射，偵測手性分子刀豆素(Concanavalin A)旋性，並獲得一致的偵測結果，說明手性分子偵測應用的可行性。

In this master thesis, we propose a chiral metasurface based on gold asymmetric U-shaped nano structures (AUSNS) with different side length. The optical characteristic is calculated by exploiting rigorous coupled-wave analysis (RCWA); that is, the azimuth angle Ψ and ellipticity sin2η. The giant optical response is observed in the near-infrared region with linear x- and y-polarization wave normal incidence. In order to analyze the chiroptical response, we introduced the complex Jones matrix and Stokes parameters to calculate the ellipse parameters of polarization states (Ψ & sin2η). We made use of the air pressure-assisted thermal imprinting to fabricate the Si mold, deposited gold layer using the E-gun evaporator on Si mold and exploited the nanotransfer printing technique to transfer the gold structures to polycarbonate (PC) substrate. We measured the Stoke parameters of the emergent light after the AUSNS metasurface through the self-erecting optical characterization microscopy system and we acquired the azimuth angle Ψ and ellipticity sin2η by equation. Its ellipticity can reach 0.548 right-handed circularly polarized and -0.978 left-handed circularly polarized with linear x- and y-polarization wave normal incidence, respectively, which occurs closely near the same region. The plasmonic property of chiral-selective applies to realize polarization switch. In chirality detection, we investigated concanavalin A, the common biomolecules of proposed research. We compared the results in linear x- and y-polarization forward incidence with backward incidence, respectively and demonstrated the right-hand characteristic of concanavalin A. It indicates that AUSNS has the potential to develop chiral detection.

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