Tunable multilayer subwavelength metallic optical devices for polarization control and displacement sensing

0621944博士。Ho Bun Chan， University of florida智力优势：本项目旨在构建和开发基于亚波长金属结构的光学器件，用于偏振控制和位移传感。多层亚波长金属结构的光学性质，包括狭缝阵列和空穴阵列，将探讨。相邻的金属层彼此靠近，以允许倏逝场的耦合。这种结构具有其单层对应物所不具备的光学特性。例如，透射光的强度很大程度上取决于金属层之间的横向位移。一种被提议的器件是半波片，其工作波长范围可以由器件参数定制，而不是受材料特性的限制。由于其紧凑的尺寸和与平面制造的兼容性，它也允许与其他组件集成。强增强的倏逝场也将被用于提高位移光学检测的灵敏度。目的是实现平面内运动的灵敏度，可与干涉检测的平面外运动相媲美。本研究的智力价值在于将多层金属纳米结构中的场增强和近场耦合用于位移传感和偏振控制。了解复杂多层金属纳米结构中倏逝场的耦合对设计光子器件具有重要的基础意义和实际意义，这些光子器件可能成为未来纳米光学系统的重要组成部分。更广泛的影响：提出的研究有望创造一种新型的紧凑型偏振控制设备，可以提高各种光学子系统的性能。采用可变形亚波长金属纳米结构的换能器可以改善导航和制导系统中的惯性传感。参与计划项目的学生将获得光学测量和器件制造方面的宝贵经验。该项目还包括弱势群体的参与。

0621944Dr. Ho Bun Chan, University of FloridaIntellectual Merit: This project aims to construct and develop optical devices based on subwavelength metallic structures for polarization control and displacement sensing. Optical properties of multilayer subwavelength metallic structures, including slit arrays and hole arrays, will be explored. Adjacent metal layers are fabricated close to each other to allow the coupling of evanescent fields. Such structures possess optical properties that are not present in their single layer counterparts. For instance, the intensity of the transmitted light depends strongly on the lateral shift between the metal layers. One proposed device is a half wave plate whose operational wavelength range can be tailored by the device parameters instead of being limited by material properties. It also allows integration with other components due to its compact size and compatibility with planar fabrication. The strongly enhanced evanescent fields will also be exploited to improve the sensitivity of optical detection of displacement. The aim is to achieve sensitivities for in-plane motion that are comparable to interferometric detection for out of plane motion. The intellectual merit of the proposed research is determined by the novel utilization of the field enhancement and the near field coupling in multilayer metallic nanostructures for displacement sensing and polarization control. Understanding the coupling of evanescent fields in complex multi-layer metallic nanostructures is of fundamental interest and practical importance in designing photonic devices that could become important building blocks in future nano-optical systems.Broader Impacts: The proposed research holds promise in creating a new class of compact devices for polarization control that could enhance the performance of various optical subsystems. Transducers involving deformable subwavelength metallic nanostructures could lead to improvements in inertial sensing in navigation and guidance systems. Students participating in the proposed projects will gain invaluable experience in optical measurement and device fabrication. The program also includes participation of underrepresented groups.