title: Metal-dielectric-metal plasmonic resonators for active beam steering in the infrared.
abstract: Active beam-steering devices near the optical frequencies have long been sought after due to their applications in communication, defense, and display technologies; however, the challenge lies in achieving actively tunable structures near these frequencies. An array of metal-dielectric-metal plasmonic resonators is demonstrated as a dynamic beam-steering device to operate at midinfrared wavelengths. We numerically demonstrate continuous-angle beam steering of 8.75° by making use of tunable properties of silicon as the active dielectric. The proposed device achieves a refractive index insensitive divergence angle and it operates in a 650 nm wide spectral window around 10 μm wavelength. The results of this Letter pave the way to exploiting active beam steering in various applications at midinfrared wavelengths.
authors.affiliation: Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey. battal@ee.bilkent.edu.tr
authors.forename: Enes
authors.initials: E
authors.lastname: Battal
authors.forename: Ali Kemal
authors.initials: AK
authors.lastname: Okyay