共振增强低噪声小尺度传输光场耦合效率的研究

Effectively acquiring small-size transmission light field of high power density is a key link in the field of nanophotonics research. Evanescent decay method based on aperture tapered metallic waveguide is most commonly used to do this,but it can only obtain a sub-wavelength low-noise transmission light field of relative low power density, which restricts its application and promotion. This project puts forward to resonantly excite gap surface plasmons via high propagating mode coupling and obtain nano-size transmission field of high power density through aperture tapered metallic waveguides by integrating spatial light modulation and optical resonant cavity. The concrete study schemes as following: ①development multi-parameter spatial light modulaiton technology, study and mastering the law how spatial light modulation to control the optical transmission characteristics of focused light field;②structuring optical resonant cavities in aperture tapered metallic waveguides by fluting grooves internally or embedding dielctric microspheres, study their impact on the optical characteristics of the transmission light field and realizing resonantly excitation, efficiently propagation and compression of gap surface plasmons;③study the impact of the combined action of spatial light modulation and optical resonant cavity on the optical characteristics of the transmission light field in the aperture tapered metallic waveguides and maximizing the resonantly excitation efficiency of gap surface plasmons. This project will enhance the power density of nano-size transmission field, broaden the application field of small-size transmission field and have an important significance in theory and practice.

有效获取高功率密度小尺度传输光场是纳米光子学研究领域的关键环节。中空锥形金属波导隐失衰减法是获取低噪声小尺度传输光场最为常用的方法，但它通常只能获取功率密度较低的低噪声亚波长传输光场，应用受到极大限制。 本项目创新性提出结合空间光调制和在中空锥形金属波导中构建光学共振腔，利用高阶传输模耦合共振激发间隙表面等离子体来获得高功率密度低噪声纳米量级传输光场。具体包括：①完善和发展多参量空间光场调制技术，研究并掌握其调控聚焦光场传输特性的规律；②研究内壁刻蚀凹槽（或嵌入介质微球体）形式构建光学共振腔对中空锥形金属波导光场传输特性的影响，实现间隙表面等离子体的共振激发和有效传输压缩；③研究空间光调制和光学共振腔共同作用对中空锥形金属波导光场传输特性的影响，最大程度提高间隙表面等离子体的共振激发效率。项目的开展将增强纳米量级传输光场的功率密度从而拓宽小尺度传输光场的应用领域，具有重要的理论和现实意义。

有效获取高功率密度小尺度传输光场是纳米光子学研究领域的关键环节。中空 锥形金属波导隐失衰减法是获取低噪声小尺度传输光场最为常用的方法，但它通常只能获取功率密度较低的低噪声亚波长传输光场，应用受到极大限制。.本项目创新性提出并成功实施了结合空间光调制和在中空锥形金属波导中构建光学共振腔，利用高阶传输模耦合共振激发间隙表面等离子体来获得高功率密度低噪声纳米量级传输光场的系统研究。项目主要研究内容包括了：①完善和发展多参量空间光场调制技术，研究并掌握其调控聚焦光场传输特性的规律；②研究内壁刻蚀凹槽（或嵌入介质微球体）形式构建光学共振腔对中空锥形金属波导光场传输特性的影响，实现间隙表面等离子体的共振激发和有效传输压缩；③研究空间光调制和光学共振腔共同作用对中空锥形金属波导光场传输特性的影响，最大程度提高间隙表面等离子体的共振激发效率。项目研究开展圆满成功并取得一系列原创性研究成果，对通过增强纳米量级传输光场的功率密度拓宽小尺度传输光场的应用领域具有重要的理论和实践借鉴意义。