近零介电常数材料中的非线性光学效应研究进展

RESEARCH ON NONLINEAR OPTICAL EFFECTS IN EPSILON-NEAR-ZERO MATERIAS

非线性光学效应在现代光子学中具有极其重要的应用,但通常非线性光学效应需要强的激光光源及长的光与物质作用距离,这些需求与现代芯片上可集成光学器件构架以及超表面器件是不符的.因此,获得更强非线性性质的材料是实现低功耗、小型器件应用的关键一步.近年来,一种介电常数消失的新型材料体系,即近零介电常数材料,被报道在亚波长传播长度下具有前所未有的巨大非线性效应及超快响应.本文主要对ENZ材料及其各种非线性光学现象做简要综述,并指出该研究领域未来一些可能的研究方向.

Nonlinear optical effects are essential for many applications in modern photonics.However,intense laser and long interaction length are required due to the weak nonlinearity in materials.Such requirements are incompatible with the integrated nanophotonic architectures and metasurface devices.So,obtaining materials with stronger nonlinear properties is a crucial step towards applications.In recent years,a new class of materials with a vanishing permittivity,known as Epsilon-Near-Zero(ENZ)materials,has been reported to exhibit unprecedented ultrafast and large optical nonlinearity.In this paper,we give a review on the work on the nonlinear phenomena in ENZ materials,and point towards some possible future research directions.