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Ultracompact refractive index sensor based on microcavity in the sandwiched photonic crystal waveguide structure |
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| Authors: | Xiaoling Wang Zhenfeng Xu Jun Zhu |
| Affiliation: | a School of Electronic Engineering, Beijing University of Posts and Telecommunications, 100876 Beijing, China b Department of Electronic and Information Engineering, Beijing Institute of Machinery, 100085 Beijing, China c State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, 100084 Beijing, China |
| Abstract: | A refractive index (RI) sensor based on the two-dimensional photonic crystal is presented. The sensor is formed by a point-defect resonant cavity in the sandwiched waveguide structure. The transmission spectrums of the sensor with different ambient refractive indices ranging from n = 1.0 to n = 1.6 are calculated. The calculation results show that a change in ambient RI of Δn = 0.001 is apparent, the sensitivity of the sensor (Δλ/Δn) is achieved with 330 nm/RIU (when lattice constant a = 440 nm), where RIU means the refractive index unit; and the transmission efficiency in the RI range of 1.0-1.6 can reach about 40% to 70%, that make the detection of spectrum easy and feasible. The properties of the sensor are analyzed and calculated using the plane-wave expansion (PWE) method and simulated using the finite-difference time-domain (FDTD) method. |
| Keywords: | Photonic crystal Sensor Microcavity Waveguide |
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