Busschaert Sebastian, Flöry Nikolaus, Papadopoulos Sotirios, Parzefall Markus, Heeg Sebastian, Novotny Lukas
Photonics Laboratory , ETH Zürich , 8093 Zürich , Switzerland.
Nano Lett. 2019 Sep 11;19(9):6097-6103. doi: 10.1021/acs.nanolett.9b02029. Epub 2019 Aug 26.
Transition metal dichalcogenides (TMDCs) exhibit high second harmonic (SH) generation in the visible due to their noncentrosymmetric crystal structure in odd-layered form and direct bandgap transition when thinned down to a monolayer. In order to emit the SH radiation into a desired direction, one requires a means to control the phase of the in-plane nonlinear polarization. Here, we couple the SH response of a monolayer MoS to an optical phased array antenna and demonstrate controllable steering of the nonlinear emission. By exploiting the intrinsic SH generation by the phased array antenna we achieve uniform emission efficiency into a broad angular range. Our work has relevance for novel optoelectronic applications, such as programmable optical interconnects and on-chip LIDAR.
过渡金属二硫属化物（TMDCs）由于其奇数层形式的非中心对称晶体结构以及在减薄至单层时的直接带隙跃迁，在可见光范围内表现出高二次谐波（SH）产生。为了将SH辐射发射到所需方向，需要一种控制面内非线性极化相位的方法。在此，我们将单层MoS的SH响应与光学相控阵天线耦合，并展示了非线性发射的可控转向。通过利用相控阵天线的固有SH产生，我们在宽角度范围内实现了均匀的发射效率。我们的工作与新型光电子应用相关，例如可编程光互连和片上激光雷达。
