In the Comment by S. C. Bakshi and D. Mitra [J. Appl. Phys. 128, 126101 (2020)], it is claimed that “cross-polarization reflection was ignored in calculation of absorptivity of that structure,” “the actual absorptivity of the new peaks [is] extremely poor (around 40%),” and hence the vertical sliding mechanism of conjoined cut-wire-pairs (CCWPs) “can't be adopted for efficient switching/tuning of the absorption spectra.” In this Response, we will demonstrate that these claims are not only unfair but also incorrect as they result from an unfortunate fundamental mistake they made in the attempt of replicating the effective free-space absorber array topology implied in the original article [J. Appl. Phys. 124, 105103 (2018)]. The use of “CCWP unit-cell within a metallic waveguide” scenario in the original work implies the realization of an infinitely large periodic array of a “super-cell,” whose structure is determined by the well-known mirror image effect of the perfect electrical conductor type boundary condition imposed by the conducting walls of the waveguide. When this fact is ignored, but instead the free-space array is formed by simply repeating the same asymmetric CCWP unit-cell periodically, a completely different absorber array topology is obtained, which is clearly irrelevant to the original design. Therefore, the results reported in the Comment belong to an alternative absorber array; they do not represent the performance of the original design. In this Response, we will clarify our points outlined above to refute the claims made in the Comment to demonstrate the validity of the original results and the usefulness of the suggested absorber array for practical purposes.

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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.