National Engineering Research Center of Electromagnetic Radiation Control Materials, State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China
As one of the essential electronic information materials, electromagnetic radiation control material manipulates the transmission, absorption and reflection of propagating electromagnetic wave. Due to the flexible design and unique properties, periodic structure has brought new development to electromagnetic radiation control technique, but its character of strong electrical/magnetic resonance also causes the narrowband problem. In this work, several kinds of electromagnetic radiation control materials based on periodic structure are introduced to realize broadband and high efficiency design by multiresonance coupling. The coupling between electrical/magnetic resonant components breaks the polarization and incident angel dependence of absorption in asymmetric periodic structure; the resonance condition based on effective electromagnetic parameters is proposed to support the design and loading method of periodic structures, eg. field confinement and pattern coupling, and the 10 dB reflection bandwidth has been increased by 65% while the lowfrequency absorption has been increased by almost 3 times; the broadband and highefficiency problem of periodic structure based polarization convector has been solved, while the proposed polarization convector of transmitting type has three functions as bandpass filtering, crosspolarization, and asymmetric transmission. Based on the dielectric layer stacking method, broadband infrared absorbers are proposed with the ability of thermal radiation control, which inspires the new technique for infrared radiation manipulation.