P1OS.7 - Design of Polymer Multimode Racetrack Resonator for Chemical Optical Sensor
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- P-1 - Optical Sensors
- Y. Choi, S. Kim, S. Jeon, E. Kim, D. Kim - School of Electical and Electronics Engineering, Chung-Ang University, Dongjak-ku, Seoul (South Korea), K. Oh - Electronics and Telecommunications Research Institute, Daejeon (South Korea)
- 629 - 630
In this paper, the polymer multimode racetrack resonator is simulated for an optical chemical sensor. It consists of the resonator, total internal reflection (TIR) mirrors, and the multimode interference (MMI) coupler. The width and height of the multimode waveguide are designed to be 3 μm and 2 μm. The multimode waveguide is easier to fabricate than a single mode waveguide because of a wide width. In order for a multimode waveguide resonator to operate as an optical sensor, it is necessary to discrimination the higher-order mode. For higher order mode discrimination, we designed novel waveguide with TIR mirrors instead of a straight waveguide at the top of the racetrack resonator. We considered the Goos-Hänchen shift and critical angle when designing a TIR mirrors. As a result of the FDTD simulation, Q-factor of this resonator can be obtained as 1.3 x 104 and the shift of the resonator output peak was 15 nm/RIU.