Abstract

This paper presents tunable and switchable perfect absorbers operating within the mid-infrared spectrum, targeting the 3 to 5 µm range with precise 0.25 µm intervals. The approach uses graphene-based nanophotonic aperiodic multilayer structures optimized through a micro-genetic optimization algorithm within an inverse design framework. Transfer-matrix-method simulations are used to tailor absorption characteristics while keeping total multilayer thickness under 2 µm. The results show tunable absorption by adjusting graphene chemical potentials, including a shift of a 4 µm absorption peak to 4.22 µm when the chemical potential changes from 0 eV to 1 eV, and angular robustness with 90% absorption up to 52 degrees.

Abstract

This paper presents tunable and switchable perfect absorbers operating within the mid-infrared spectrum, targeting the 3 to 5 µm range with precise 0.25 µm intervals. The approach uses graphene-based nanophotonic aperiodic multilayer structures optimized through a micro-genetic optimization algorithm within an inverse design framework. Transfer-matrix-method simulations are used to tailor absorption characteristics while keeping total multilayer thickness under 2 µm. The results show tunable absorption by adjusting graphene chemical potentials, including a shift of a 4 µm absorption peak to 4.22 µm when the chemical potential changes from 0 eV to 1 eV, and angular robustness with 90% absorption up to 52 degrees.

Abstract

This paper presents tunable and switchable perfect absorbers operating within the mid-infrared spectrum, targeting the 3 to 5 µm range with precise 0.25 µm intervals. The approach uses graphene-based nanophotonic aperiodic multilayer structures optimized through a micro-genetic optimization algorithm within an inverse design framework. Transfer-matrix-method simulations are used to tailor absorption characteristics while keeping total multilayer thickness under 2 µm. The results show tunable absorption by adjusting graphene chemical potentials, including a shift of a 4 µm absorption peak to 4.22 µm when the chemical potential changes from 0 eV to 1 eV, and angular robustness with 90% absorption up to 52 degrees.

Abstract

This paper presents tunable and switchable perfect absorbers operating within the mid-infrared spectrum, targeting the 3 to 5 µm range with precise 0.25 µm intervals. The approach uses graphene-based nanophotonic aperiodic multilayer structures optimized through a micro-genetic optimization algorithm within an inverse design framework. Transfer-matrix-method simulations are used to tailor absorption characteristics while keeping total multilayer thickness under 2 µm. The results show tunable absorption by adjusting graphene chemical potentials, including a shift of a 4 µm absorption peak to 4.22 µm when the chemical potential changes from 0 eV to 1 eV, and angular robustness with 90% absorption up to 52 degrees.