Mahani Fatemeh Fouladi, Astorga Luis Angel Mayoral, Choi Hyung Woo, Mokhtari Arash, Berini Pierre
Optical and RF Communication Systems (ORCS) Lab, Electrical Engineering Department, Shahid Bahonar University of Kerman, Kerman, 7616913439, Iran.
School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON, K1N 6N5, Canada.
Sci Rep. 2024 Jan 24;14(1):2084. doi: 10.1038/s41598-024-52564-9.
We present an experimental study of plasmonic slanted slit gratings (PSSGs) designed to achieve directional coupling between an incident light beam and surface plasmon polaritons (SPPs) propagating along the surface of the structure. We also investigate mirrored PSSG pairs interconnected by a plasmonic slab waveguide. The structures are fabricated using direct milling by a gallium focused ion beam (FIB). In a mirrored pair arrangement, the first PSSG couples a perpendicularly-incident light beam to SPPs propagating in one direction along the waveguide, while the second PSSG decouples SPPs to perpendicularly-emerging light. This configuration shows promise for sensing applications due to the high sensitivity of the excited SPPs to changes in the refractive index of the bounding medium, and the separation of the optics from the fluidics by the substrate. The design also exhibits robustness to fabrication tolerances. The optical characteristics and sensing potential are investigated theoretically and experimentally, highlighting its potential for a wide range of applications.
我们展示了一项关于等离子体倾斜狭缝光栅（PSSG）的实验研究，该光栅旨在实现入射光束与沿结构表面传播的表面等离子体激元（SPP）之间的定向耦合。我们还研究了由等离子体平板波导互连的镜像PSSG对。这些结构是使用镓聚焦离子束（FIB）通过直接铣削制造的。在镜像对配置中，第一个PSSG将垂直入射的光束耦合到沿波导在一个方向上传播的SPP，而第二个PSSG将SPP解耦为垂直出射的光。由于激发的SPP对边界介质折射率变化的高灵敏度，以及通过基板将光学器件与流体器件分离，这种配置在传感应用方面显示出前景。该设计对制造公差也具有鲁棒性。我们从理论和实验上研究了其光学特性和传感潜力，突出了其在广泛应用中的潜力。
