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Opt Lett. 2013 Mar 15;38(6):983-5. doi: 10.1364/OL.38.000983.

Metal-dielectric-metal plasmonic resonators for active beam steering in the infrared.

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  • 1Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey.


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.

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