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Non-Mechanical Beam Steering in the Mid-Wave Infrared

机译:中波红外的非机械光束转向

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The mid-wave infrared (MWIR) portion of the electromagnetic spectrum is critically important for a variety of applications such as LIDAR and chemical sensing. Concerning the latter, the MWIR is often referred to as the "molecular fingerprint" region owing to the fact that many molecules display distinctive vibrational absorptions in this region, making it useful for gas detection. To date, steering MWIR radiation typically required the use of mechanical devices such as gimbals, which are bulky, slow, power-hungry, and subject to mechanical failure. We present the first non-mechanical beam steerer capable of continuous angular tuning in the MWIR. These devices, based on refractive, electro-optic waveguides, provide angular steering in two dimensions without relying on moving parts. Previous work has demonstrated non-mechanical beam steering (NMBS) in the short-wave infrared (SWIR) and near infrared (NIR) using a waveguide in which a portion of the propagating light is evanescently coupled to a liquid crystal (LC) layer in which the refractive index is voltage-tuned. We have extended this NMBS technology into the MWIR by employing chalcogenide glass waveguides and LC materials that exhibit high MWIR transparency. As a result, we have observed continuous, 2D MWIR steering for the first time with a magnitude of 2.74° in-plane and 0.3° out-of-plane.
机译:电磁频谱的中波红外(MWIR)部分对于多种应用(如激光雷达和化学传感)至关重要。关于后者,由于许多分子在该区域显示出独特的振动吸收,因此MWIR通常被称为“分子指纹”区域。迄今为止,控制MWIR辐射通常需要使用诸如万向节之类的机械设备,这些设备笨重,缓慢,耗电且容易发生机械故障。我们介绍了第一个能够在MWIR中进行连续角度调谐的非机械式光束操纵器。这些基于折射电光波导的设备可在不依赖运动部件的情况下提供二维角度控制。先前的工作已经证明了使用波导的短波红外(SWIR)和近红外(NIR)的非机械光束转向(NMBS),其中一部分传播光e逝耦合到液晶中的液晶(LC)层。折射率是电压调谐的。我们通过采用硫属化物玻璃波导和具有高MWIR透明性的LC材料,将这种NMBS技术扩展到MWIR中。结果,我们首次观察到连续的2D MWIR转向,其面内幅度为2.74°,面外幅度为0.3°。

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