Abstract- Design of mid-infrared ultra-wideband metallic absorber based on circuit

• Kamalodin Arik
• Sajjad Abdollahramezani
• Saeed Farajollahi
• Amin Khavasi
• Behzad Rejaei

http://www.sciencedirect.com/science/article/pii/S0030401816306046

An ultra-broadband absorber of light is proposed by using periodic array of ultra-thin metallic ribbons on top of a lossless quarter-wavelength dielectric spacer placed on a metallic reflector. We propose a fully analytical circuit model for the structure, and then the absorber is duly designed based on the impedance matching concept. As a result, normalized bandwidth of 99.5% is realized by the proposed absorbing structure in mid-infrared regime. Performing a numerical optimization algorithm, we could also reach to normalized bandwidth of 103%.