Abstract
The goal of the proposed work is to design and analyze a low temperature sensor to measure cryogenic temperature in the range of 0–120 K. Proposed sensor design uses Distributed Bragg Reflector (DBR) multi-layer structure. DBR consists of high-low alternate dielectric materials arranged in one direction which acts as a one-dimensional photonic crystal (pc). Gallium Arsenide (GaAs) is used as high dielectric material and air as low dielectric material. GaAs dielectric constant is a function of the temperature and hence it can be used to detect any variation in the temperature. In this work, the number of alternate multi-layers (N) is chosen as 8 and the frequency of input electromagnetic wave is taken as 24THz. We achieved a high sensitivity of 1.525 nm/K with a Q factor of 3534. The proposed sensor suits for the applications where critical low temperature measurement is needed.
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