A second harmonic-mode filter for multiple physical quantity detection based on 1D layered hyperstructure

In this paper, a novel filter based on the second harmonic generation (SHG) of a one-dimensional layered hyperstructure (LHS) is proposed for the detection of multiple physical quantities (MPQ). In conventional filter designs, there is greater consideration of performance improvement, while the potential of MPQ is disregarded, which is a limitation of research thoughts. Through SHG, this LHS is capable of low-cost, low-loss, continuous detection of magnetic induction intensity, incident angle, temperature, and the thickness of magnetized InSb. Numerical investigations into various detection performance parameters-including linear measurement range and sensitivity-have been carried out using the transfer matrix method. The related values for magnetic induction intensity measurements are from 0.5 T to 0.9 T, and 2.05 GHz T^-1. For angle detection, the correlations are 30° to 60°, and 37.21 GHz per °. Correlation values for temperature detection are from 325 K to 345 K, and 39.49 GHz K^-1. When measuring the thickness of magnetized InSb, the values are from 0.39 μm to 0.43 μm and 66.1554 GHz μm^-1. This research offers a theoretical foundation for the development of multiple physical quantity detection based on the second harmonic. Additionally, it offers new insights and directions for further advancements in the field of filter technology.