Sliding planar conjoined cut-wire-pairs: A novel approach for splitting and controlling the absorption spectra

Abstract

In this study, vertical sliding of conjoined cut-wire-pairs (CCWPs) over the substrate plane is demonstrated to split the absorption peak into two, with a reasonable decrease in the absorption peak, while providing the flexibility of controlling the locations of the absorption peaks by the use of sliding (i.e., shift) amount s in the S-band. In the design, the CCWP structure simply turns into a square patch absorber with a single perfect absorption peak when s = 0. For the proof of concept, the CCWPs having s = 0, 0.5, 1.0, 1.5, and 2.0 mm are fabricated and the absorption spectra are measured. The experimental results agree very well with the simulation results. Moreover, the absorption mechanism is investigated considering the clockwise rotated CCWP and the counterclockwise rotated CCWP structures. It is significant to state that the CCWP design may take place in plenty of applications such as sensing, obtaining dual/multi-band or broadband of absorption, and switching/tuning the absorption spectra.