Acta Optica Sinica, Volume. 39, Issue 11, 1123002(2019)
Fano Resonance-Sensing Mechanism of Photonic Crystal Nanobeam Side-Coupling Aperture Chirped Photonic Crystal Nanobeam Cavity Structure
This study proposes a photonic crystal nanobeam (PCN) side-coupling aperture chirped photonic crystal nanobeam cavity (PCNC) structure based on the Fano resonance principle. The Fano resonance can be realized by the destructive interference between the wide continuous state produced by the PCN structure and narrow discrete state generated by the PCNC structure. The generation mechanism of Fano resonance in the structure is qualitatively analyzed via the coupled mode theory, and the structure is simulated by using the finite-difference time-domain method. After quantitatively studying the influences of the structural parameters on the refractive-index sensing characteristics of the system, the structural parameters are optimized. Results show that the optimized figure of merit is as high as 5.1×10 3, providing an effective theoretical reference and technical guidance for the design of integrated photonic-crystal waveguide sensors.
Get Citation
Copy Citation Text
Ying Chen, Xinbei Gao, Yangmei Xu, Jinggang Cao, Jinchao Xie, Qiguang Zhu, Shaohua Li. Fano Resonance-Sensing Mechanism of Photonic Crystal Nanobeam Side-Coupling Aperture Chirped Photonic Crystal Nanobeam Cavity Structure[J]. Acta Optica Sinica, 2019, 39(11): 1123002
Category: Optical Devices
Received: Mar. 29, 2019
Accepted: Jul. 15, 2019
Published Online: Nov. 6, 2019
The Author Email: Chen Ying (chenying@ysu.edu.cn)