中国激光, 2018, 45 (7): 0710002, 网络出版: 2018-09-11
基于宇称-时间对称结构透射率变化的可调高灵敏度温度传感器 下载: 893次
Tunable High Sensitivity Temperature Sensor Based on Transmittance Changes of Parity-Time Symmetry Structure
探测器 光学传感器 温度 热光材料 宇称-时间对称结构 detectors optical sensor temperature Thermo-optical material parity-time symmetry structure
摘要
为了实现更高灵敏度的温度传感,提出一种基于宇称-时间(PT)对称结构的光学温度传感器理论模型。该模型在PT对称布拉格反射镜结构中嵌入热光材料共振腔。热光材料的折射率随温度变化,进而影响结构在缺陷模式处的透射率大小。利用传输矩阵法计算模型的透射率谱线,结果显示,在不同温度下,该结构的缺陷模式透射率大小变化远大于模式位置的变化,因此,通过透射率大小的变化可实现温度传感。微腔共振导致结构具有独特的增益放大,该传感器灵敏度最大可达6.82 dB·K
-1,检测范围最大达44.4 K,并且可以通过调节结构参数,使传感器在小范围高灵敏度和大范围低灵敏度两种模式之间转换。
Abstract
In order to achieve a temperature sensor with a higher sensitivity, a theoretical model is proposed. The theoretical model is based on parity-time (PT) symmetry structure with a defect cavity composed of thermo-optical material. The refractive index of thermo-optical material is dependent on temperature. The changes of temperature will influence the transmittance of the defect mode in the structure. The transmittance spectra are calculated by the transfer matrix method. It is found that with the change of temperature, the transmittance value of the defect mode changes much larger than the location changes of the defect mode. Thus, the change of transmittance value with temperature is used for temperature sensing. Due to the unique gain amplification of the structure, the maximum sensitivity of the sensor is 6.82 dB·K
-1. and the detecting range can reach 44.4 K. Through the modulation of structural parameters, the sensor can work with high sensitivity in small temperature range, or with low sensitivity in big temperature range.
张亦弛, 江晓明, 夏景, 方云团. 基于宇称-时间对称结构透射率变化的可调高灵敏度温度传感器[J]. 中国激光, 2018, 45(7): 0710002. Yichi Zhang, Xiaoming Jiang, Jing Xia, Yuntuan Fang. Tunable High Sensitivity Temperature Sensor Based on Transmittance Changes of Parity-Time Symmetry Structure[J]. Chinese Journal of Lasers, 2018, 45(7): 0710002.