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15 November 2018 Broad FSR and high sensitivity refractive index sensor using photonic crystal nanobeam cavity with composite lattice cells
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Proceedings Volume 10964, Tenth International Conference on Information Optics and Photonics; 109643Y (2018) https://doi.org/10.1117/12.2506006
Event: Tenth International Conference on Information Optics and Photonics (CIOP 2018), 2018, Beijing, China
Abstract
We propose a broad FSR and high sensitivity refractive index (RI) sensor by using a composite lattice cells based photonic crystal nanobeam cavity (CLC-PCNC). Due to the special structure of the proposed CLC, cavities with free spectra ranges (FSRs) more than 90nm meanwhile with quality factor (Q) values above 5×104 are obtained. Besides, the optical overlap integrals of nearly 30% are achieved for both of the fundamental and the first order dielectric mode of the cavity, quantitatively demonstrating strong interaction between optical and matter, resulting in high sensitivities for RI sensing. Simulation results show that sensitivities of 390.9 nm/RIU and 413.6 nm/RIU, and detection limits of 7.6×10-6 RIU and 7.2×10-6 RIU, are achieved for the fundamental and the first order dielectric mode, respectively. Furthermore, ultra-compact size of only about 220 nm × 550 nm × 10 μm (height × width × length) of the cavity is realized. Therefore, due to the remarkable performances, the proposed sensor shows great potential in realizing applications such as high integration large-scale on-chip sensing and multi-function detection in the future.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Chao Wang and Huiping Tian "Broad FSR and high sensitivity refractive index sensor using photonic crystal nanobeam cavity with composite lattice cells", Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 109643Y (15 November 2018); https://doi.org/10.1117/12.2506006
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