A gravity field tailored metamaterial absorber containing liquid metal for polarization separation

In this article, a novel gravity field tailored metamaterial absorber (MA) dealing with polarization separation has been put forward. The proposed MA has two built-in glass grooves of different shapes but equal volume, which contains liquid metal (eutectic gallium-indium) and liquid oil, respectively. Hence, different absorption states can be realized in a way of the gravity field tailored. Unlike the conventional temperature or magnetic field regulation, a gravity field tailored MA does not require additional controllers, and the control technique itself is integrated into the whole structure. Besides, the lumped circuit is used to be equivalent to our MA model for exploring the principle of absorption performance variation. The surface current distributions and the electric field distributions are given to explain its physical mechanism. Simulation results have shown that the absorption peaks shift from 9.24 GHz to 7.4 GHz for the TE wave and from 12.06 GHz to 10.96 GHz for the TM wave when the MA is rotated by 180°, which provides a subverted idea for the promising gravity field tailored optical devices. Also, a 5 × 5 proportional arrangement to achieve two narrow polarization-separated absorption bands is proposed for further research.