人造次波長等級的超穎表面在透過入射電磁波激發出表面電漿共振，其產生的共
振模態可以對偏振、相位、振幅、角動量進行調控，這些特點為平面光學元件、系統
提供了一個有未來發展性的平台，例如:微型光譜儀(compact spectrometer)和深度傳感
器(depth sensor)。由於金屬共振產生的焦耳損失較高，因此電漿子超穎表面的工作效
率在本質上受到限制，特別是在製作穿透式元件上。為了解決這個問題，最近人們對
利用介電質來設計超穎表面很感興趣，它們在共振時可忽略的吸收損耗，且介電質本
身透射率高，所以常用於製作穿透式元件，但介電質超穎表面中的高深寬比明顯地增
加了製程難度。因此，本論文致力於研究金屬穿透式超穎表面，期望在光學波段上實
現高透射率且製程容易的超穎表面，我們將廣義 Kerker 條件的概念引入電漿子超穎
表面中，並運用巴比涅原理的結構設計方法，在玻璃基板上設計單元結構，由金屬表
面的正結構和金屬孔洞之負結構所組成，中間為光阻的奈米柱，透過同時激發電偶極
矩、磁偶極矩、電四極矩、磁四極矩與磁環型線圈矩，並且滿足廣義 Kerker 條件。因
此正向散射得到了顯著增強，且同時具有最小的背向散射，在通訊波段下，實現了最
新的交叉偏振轉換效率超過 50％的電漿子超穎表面，這較以往的研究結果要來得高
出許多。接下來，我們將幾何相位法與我們設計的電漿子惠更斯超穎表面作結合，製
作兩種不同的光學元件，第一個是幾何相位梯度超穎表面，它有著能將光束偏折至特
定方向之作用；第二個是平面聚焦超穎透鏡，它可以將入射光偏振轉換並有效地聚焦
之功用，我們利用電子束微影系統成功地製作這兩項元件，展示了高效能電漿子超穎
表面實際應用的可行性，對未來提供一個嶄新的研究方向。

Through introducing nanophotonic resonant modes into sub-wavelength structures, metasurfaces show a great capability for phase and amplitude modulation of light. Due to high Joule loss in metals, plasmonic metasurfaces suffer from low working efficiency, especially for the transmission scheme. Although high-index dielectric metasurfaces possess high transmission intensity, high aspect ratio of the dielectric metasurfaces make them being difficult for manufacturing.
In this work, we proposed and demonstrated highly-transmissive plasmonic metasurfaces via generalized Kerker condition. The optimized metasurface shows a state-of-the-art circular polarization conversion efficiency beyond 50% at telecom wavelengths. As for highlights of our metasurface, a beam deflector and a focusing metalens are demonstrated by incorporating the high-performance plasmonic metasurface with the geometric phase method. Due to its broadband and high transmission efficiency properties, the success of this work will offer a promising platform for developing high-performance flat optical components, integrated optoelectronic devices and systems, just named a few.

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