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標題: | 表面電漿金奈米結構之三維全彩光操控研究 Three-dimensional full color light manipulation by plasmonic nanostructures |
作者: | Chia-Min Chang 張家民 |
指導教授: | 黃鼎偉 |
關鍵字: | 表面電漿子,奈米結構,光操控,奈米加工,表面光學, Surface plasmon,Light manipulation,Nanostructures,Laser fabrication, |
出版年 : | 2014 |
學位: | 博士 |
摘要: | 表面電漿子(surface plasmon polariton, SPP)是由外加電磁波與金屬薄膜作用後激發的表面電荷震盪現象。此現象在金屬薄膜表面的近場範圍內產生光場的侷域化效應,並形成表面電漿子傳遞波。表面電漿波與表面奈米結構之間的交互作用除了近場的穿透與反射波外,還有遠場的散射現象,而如何利用表面的奈米結構操控表面電漿波是目前電漿子元件研究上的重要議題。本論文研究基於此物理現象與需求,利用飛秒雷射製作特殊的金奈米凸起結構,並由全反射式光學量測系統量測金屬奈米結構與表面電漿波交互作用的遠場散射影像,並探討其遠場散射行為與操控散射光之應用,藉此發展奈米尺度之三維光操控元件。
本論文分作兩部分,第一部分針對單波長激發的表面電漿波與金奈米凸起結構交互作用的光學散射特性作討論,並分析其不同聚焦平面之散射影像,觀察圓弧結構的三維空間聚焦與發散現象。此金奈米凸起結構提供垂直方向的波向量使表面電漿波輻射到三維空間。在此基礎上,進而設計金奈米凸起結構的幾何排列操控表面電漿波的三維散射行為,加以控制聚焦位置、高度以及光強度空間分布。第二部分討論多波長激發的表面電漿波與金奈米凸起作用的散射結果,觀察激發波長、圓弧排列之金奈米凸起結構、聚焦位置三者之間的相互關係,並量測其幾何排列對於表面電漿波的多波長三維散射行為。 綜合上述,本研究利用雷射於金薄膜表面加工製作金奈米凸起結構,研究其與可見光波段激發之表面電漿波交互作用後,退耦回遠場散射光的現象,並利用奈米凸起結構之幾何排列操控散射光於三維空間中重建聚焦,探討可見光波段激發之表面電漿波與此結構之散射行為。此研究結果將有助於發展三維光操控,積體光學元件以及表面電漿子元件之應用。 Using nanostructures to manipulate surface plasmon polariton (SPP) plane waves is an important issue. The interactions of surface nanostructure on SPP wave involve not only the in-plane behavior, but also out-of-plane scattering which is captured as the far-field radiated light. In this dissertation, by using the monochrome laser and multiwavlength laser, the three-dimensional focusing and diverging of SPP waves by a plasmonic structure composed of laser-fabricated gold nanobumps were studied. The forward and backward scattering from individual gold nanobump are observed above and below gold surface, respectively. The gold nanobump structure confers additional three-dimensional propagating wave vectors on SPP wave for departing from surface. A practical application to manipulate the three-dimensional plasmonic scattering is proposed by arranging the gold nanobumps. We manipulate the scattering of SPP waves by various plasmonic structures composed of arranged nanobumps on a gold thin film. Upon controlling the geometry of the plasmonic structures, the height, position, and pattern of scattered light can be modified as desired. It provides a simple and efficient way to project a specific light pattern into free space, and demonstrate the capability of three-dimensional light manipulation. By precisely designing a particular curved structure with appropriate radius of curvature and adjacent interspacing of nanobumps, we can construct a clear single focusing spot at a specific altitude. These results confirm the easy controllability of the focused spot in three-dimensional space by settling the unit curved structures. This research has potential to be applied in the area such as the integrated photonic circuit in the future. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/56681 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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