Investigation of unidirectional ultra-wideband absorption in the one-dimensional plasma photonic crystals with Thue-Morse sequence

Abstract

In this work, the properties of tunable unidirectional ultra-wideband absorption for one-dimensional (1D) plasma photonic crystals (PPCs) with the Thue-Morse sequence are theoretically investigated, which consist only of eight plasma layers with two different plasma frequencies. The computed results show that whether the incident electromagnetic wave is the TM wave or the TE wave, the unidirectional ultra-wideband absorption can be observed in the proposed 1D PPCs, and the largest relative bandwidths of unidirectional absorption regions (UARs) for TM and TE waves are 128.31% and 64.16%, respectively. To study the performance of UARs, the effects of the parameters of such PPCs on the UAR are also discussed. The obtained results indicate that the tuning effects of the incident angle on the UARs for TM and TE waves are different, but similar trends of UARs for TM and TE waves can be observed when the plasma frequency and filling factor are changed, respectively.