Effects of dielectric spacer on absorption characteristics of double-headed arrow shaped perfect absorber

Abstract

In this study, effects of dielectric spacer on absorption characteristics of double-headed arrow shaped perfect absorber (PA) are investigated. The PA nanoantenna array is analyzed by using the FDTD (Finite Difference Time Domain) method. Also the electric field distributions of PA array are obtained for different dielectric layers. To analyze the refractive index sensing capability of the PA array, the sensitivity characteristics are investigated by loading different refractive indexed dielectric cladding media. Owing to the dual-band spectral response, enhanced electric fields, and refractive index sensitivity, the double-headed arrow PA nanoantenna array can be used for bio-sensing applications in infrared regime.