Theoretical Proposal of a Multiphysical Quantity Measurable Sensor With Coexistence of Absorption and Transmission

In this article, a 1-D periodic photonic crystals (PCs) cell structure composed of indium antimonide (InSb) and common dielectrics is proposed for the application of detection of temperature and magnetic fields with an absorption peak in the transmission band (APITB), and the sensing properties are also studied with the sensitivity (
${S}$
) of 1.519 THz/T (detection range: 1–4.5 T) and 0.081 THz/K (detection range: 220–290 K) for the measurement of magnetic and temperature fields with coexistence of absorption and transmission. Based on the tunability of APITB, the general structure of PCs with InSb is designed by stacking different magnetic fields of cell structure giving rise to the realization of a transmission window in the absorption band (TWIAB) due to each joining configuration of APITB. Besides, TWIAB with different distributions in THz regime can be obtained by changing the magnetic fields. Moreover, through the analysis of its sensing performance, it can be concluded that the proposed splicing structure can achieve a wide range of magnetic field detection from 0.6 to 5.1 T in the THz regime with a sensitivity of 1.85296 THz/T. These calculated results can assist in the multiphysical quantity measurement of magnetic and temperature fields with a coexisting absorption–transmission conversion.