Regular Article

Extending the absorption band from infrared to ultraviolet using the ITO transition from reflection to transparence

¹ Laboratoire des semiconducteurs et matériaux fonctionnels. Université Amar Telidji de Laghouat. Bd des Martyrs BP37G, Laghouat 03000, Algerie
² Department of Physics, Engineering Physics and Astronomy, Department of Chemistry, Queen's University, Kingston, ON K7L3N6, Canada

^* e-mail: nunzijm@queensu.ca

Received: 18 June 2021
Received in final form: 20 August 2021
Accepted: 14 September 2021
Published online: 1 October 2021

Abstract

A numerical simulation based on the finite-element method shows that a metamaterial absorber using Tungsten (W) and Indium tin oxide (ITO) plasmonic metals can be ultra-broadband and show high-performance. Conventional broadband absorbers usually consist of multiple metal-dielectric layers or multi-resonators and have a bulky shape. The present work investigates the possibility to reach optimal characteristics with a simple design by combining two plasmonic materials (W/ITO) within a single resonator. Involving the ITO transition from reflection to transparence dramatically increases the absorption bandwidth, which is extended from infrared to ultraviolet, with up to 99.92% absorption. The design is polarization-insensitive under oblique incidence, up to 75° and 80°, for TE and TM polarization waves, respectively.