项目名称: 对称性破缺的双层金属光栅中模式耦合机制及其应用研究
项目编号: No.11504437
项目类型: 青年科学基金项目
立项/批准年度: 2016
项目学科: 数理科学和化学
项目作者: 沈杨
作者单位: 中山大学
项目金额: 24万元
中文摘要: 连续或分立的贵金属纳米结构体系可以产生表面等离子体谐振,在纳米尺度下对光进行局域、传导、调制和增强。此特性被广泛应用于集成光子学器件以及生物探测器上,是近年来国际上迅猛发展的热点研究领域。本申请项目中,我们将以错位双层金属光栅作为模型结构来研究非近场框架下金属纳米结构体系中的新颖光学现象和蕴含的物理原理,例如对称性破缺对双层金属光栅中模式耦合的调控机制,以及表面等离子体激元单向耦合效应的反铁磁体自旋波类比等。在非近场框架下,基于准静态近似的模式耦合理论不再适用,因此探索金属纳米结构体系在非近场框架下的新的模式耦合机制具有科学意义。另一方面,我们将发展一套简单、高效的微纳制备工艺,在实验上验证错位双层金属光栅的光学特性。同时进一步探索错位双层金属光栅的相关应用原理,在实验上演示错位双层金属光栅在折射率传感、生物医学传感以及表面等离子体激元单向耦合器和分束器上的应用,实现其应用价值。
中文关键词: 表面等离子体谐振;金属光栅;折射率传感器;单向耦合器;对称性破缺
英文摘要: Isolated and continuous metallic nanostructures can localize, guide, modulate and amplify light in a nanoscale spatial region by the excitation of surface plasmons (SPs). These striking features result in a wide range of applications in integrated optics and biosensing. In this proposal, we will focus on the novel optical properties and underlying physics of the dislocated double-layered metal gratings (DDMGs) in non-near-field interaction limit. For example, the role of symmetry breaking in mode coupling of DDMG and the plasmonic analogue of spin waves in antiferromagnets will be explored in depth. In the far-field coupling regime, a mode coupling theory based on the quasi-electrostatic approximation only gives a very limited description of this plasmonic system. Therefore, studying the physics of plasmonic system in non-near-field regime will contribute a more comprehensive understanding to the mode coupling mechanisms in this plasmonic system. Meanwhile, we will develop a cost-effective and high-throughput nanofabrication method to prepare the DDMG samples and experimentally demonstrate the optical properties of DDMG. Base on the above research, we will further design the DDMG-based refractive index/biomedical sensors and SPP unidirectional coupler/splitter, as well as experimentally demonstrate their performance in practical applications.
英文关键词: surface plasmon resonance;metal grating;refractive index sensor;unidirectional coupler;symmetry breaking