Kazanskiy Nikolay Lvovich, Khonina Svetlana Nikolaevna, Butt Muhammad Ali
Department of Technical Cybernetics, Samara National Research University, 443086 Samara, Russia.
Institute of RAS-Branch of the FSRC "Crystallography and Photonics" RAS, 443086 Samara, Russia.
Sensors (Basel). 2020 Jun 17;20(12):3416. doi: 10.3390/s20123416.
In this paper, a racetrack ring resonator design based on a subwavelength grating double slot waveguide is presented. The proposed waveguide scheme is capable of confining the transverse electric field in the slots and the gaps between the grating segments. This configuration facilitates a large light-matter interaction which elevates the sensitivity of the device approximately 2.5 times higher than the one that can be obtained via a standard slot waveguide resonator. The best sensitivity of the design is obtained at 1000 nm/RIU by utilizing a subwavelength grating double slot waveguide of period 300 nm. The numerical study is conducted via 2D and 3D finite element methods. We believe that the proposed sensor design can play an important role in the realization of highly sensitive lab-on-chip sensors.
本文提出了一种基于亚波长光栅双槽波导的跑道环形谐振器设计。所提出的波导方案能够将横向电场限制在狭槽以及光栅段之间的间隙中。这种结构有利于实现较大的光与物质相互作用，从而使该器件的灵敏度比通过标准狭槽波导谐振器所能获得的灵敏度提高约2.5倍。通过使用周期为300 nm的亚波长光栅双槽波导，该设计在1000 nm/RIU时获得了最佳灵敏度。数值研究通过二维和三维有限元方法进行。我们相信，所提出的传感器设计能够在实现高灵敏度的芯片实验室传感器方面发挥重要作用。
