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| High Resolution and Practical Photonic Thermometer by Side-coupled One-dimensional Photonic Crystal Microcavity |
| XIONG Yi-ti1,2,KANG Guo-guo1,ZHANG cheng1,2,XU Tong-tong1,2,GU Lin-peng3,4,5,GAN Xue-tao3,4,5,PAN Yi-jie2,QU Ji-feng2 |
1.Beijing Institution of Technology, Beijing 100081,China
2.National Institute of Metrology, Beijing 100029,China
3.Schoolof Physical Science and Technology, Northwestern Polytechnical University, Xi′an, Shaanxi 710129, China
4. Shaanxi KeyLaboratory of Optical Information Technology, Northwestern Polytechnical University, Xi′an, Shaanxi 710129, China
5.Key Laboratory of Light-Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology,Northwestern Polytechnical University, Xi′an, Shaanxi 710129, China |
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Abstract Aiming at in-line coupled one-dimensional photonic crystal (1D PhC) microcavity with high quality factor (Q) but extremely low transmittance, a side-coupled 1D PhC thermometer with high resolution, signal to noise ratio and dynamic range was proposed. Through modulating reflection coefficient of photonic crystal units and overlap of mode field between the microcavity and coupling waveguide, the Q and transmittance of the PhC device were improved. The total Q-factor, sensitivity, extinction ratio, and mode spacing between fundamental and secondary mode of the fabricated PhC device were 2.7×104, 65.6pm/℃, 0.45 and 18.5nm, respectively. By adopting a sweep frequency measurement technique, the resolution of the proposed photonic thermometer reaches millikelvin and the sensing range is over 280℃.
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Received: 13 April 2021
Published: 19 September 2022
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2022, Vol. 43 
