Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey.
Opt Lett. 2013 Mar 15;38(6):983-5. doi: 10.1364/OL.38.000983.
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.
由于在通信、国防和显示技术中的应用，人们一直在寻求光学频率附近的主动波束控制装置；然而，挑战在于如何在这些频率附近实现可主动调谐的结构。本文演示了一种金属-介质-金属等离子体激元共振器阵列，作为一种可在中红外波长工作的动态波束控制装置。通过利用硅的可调谐特性，我们数值演示了连续角度的波束转向，角度为 8.75°。所提出的器件实现了对折射率不敏感的发散角，并且在围绕 10 μm 波长的 650nm 宽光谱窗口中工作。本研究为在中红外波长的各种应用中实现主动波束控制铺平了道路。
