Weisman Dror, Arie Ady
Opt Lett. 2019 Aug 1;44(15):3689-3692. doi: 10.1364/OL.44.003689.
We experimentally demonstrate dynamic, electrically controlled shaping of plasmonic beams, propagating at the boundary between a metal and a dielectric, by using the thermo-optic effect. The concept is based on selectively heating a specific region in which the plasmonic beam passes by injecting electrical current to an isolated metal layer. This leads to transverse modulation of the wavefront through the thermal dispersion of the dielectric layer above this metal region. We demonstrate two active plasmonic devices: a plasmonic mode converter between the fundamental and first-order Hermite-Gauss modes and a tunable plasmonic lens with a dynamically varying focal length.
我们通过实验证明，利用热光效应可以对在金属与电介质边界处传播的等离子体光束进行动态、电控整形。该概念基于通过向隔离的金属层注入电流，选择性地加热等离子体光束通过的特定区域。这会通过该金属区域上方电介质层的热色散导致波前的横向调制。我们展示了两种有源等离子体器件：一种在基模和一阶厄米 - 高斯模之间的等离子体模式转换器，以及一种焦距动态变化的可调谐等离子体透镜。
