Multiband Generation and Absorption Enhancement in a Graphite-Based Metal-Free Absorber

A technique is implemented for multiband generation and absorption enhancement in a graphite-based absorber. The aspect ratio of the graphite sheet is selected to support the generation of multiple absorption bands. Later on, the notches and slots are inserted in the graphite sheet for absorption enhancement. The generated multiple absorption bands can be controlled separately by varying the different physical parameters of the absorber. The absorber response can be set with the desired frequency ratio, number of bands with desired bandwidth, level of the absorption peaks and frequency selectivity. The resonant frequency of the generated multiple bands can be shifted so that either they can be merged to provide the wide absorption band or the multiband response with sufficient guard bands. The research work represents a way to implement the metal-free absorber structure. Moreover, the proposed structure is polarization insensitive and operates with wide value of the incident angle. In addition, the proposed absorber can also be utilized as a sensor with high sensitivity.