A Multitasking Layered Nonlinear Metastructure With Polarization Conversion and Multiphysical Quantities Detection

In this article, a multitasking layered nonlinear metastructure (NM) with polarization conversion (PC) and multiphysical quantities detection (MPQD) is investigated, comprising two common media, a nonlinear Kerr medium, and indium antimonide (InSb). The incident electromagnetic waves (EWs) are considered as linear waves. Considering the temperature-tunable property of InSb, the transmission phase difference and polarization form can be tuned by the temperature. When the temperatures are adjusted to 286 or 300 K, the transmitted EWs can be converted to circular polarization waves (CPWs), classified as left-handed CPWs (LHCPWs) and right-handed CPWs (RHCPWs), whose polarization energy transmission rates (PERs) are 0.9147 and 0.9128. With the introduction of the nonlinear Kerr medium, the NM will have the feature of tunability for the electromagnetic intensity, which can be employed to encrypt the polarization information and adjust the PER peak related to the performance of MQPD. Moreover, with EWs being incident, the detection of the refractive index, incident angle, and temperature can be realized by confirming the frequency of the special EWs PER peak. The relevant detection ranges are 1.45~2.20, 246~296 K, and $72^{\circ }{\sim } 82^{\circ }$ . This multifunctional layered NM integrating PC and MQPD can not only be applied to the antenna fields but also has certain application scenarios in industrial production and detection.