坡印亭病媒
红外线的
衍射
光子学
波长
材料科学
电场
波束宽度
硅
克尔效应
电介质
强度(物理)
自聚焦
光电子学
非线性系统
物理
光学
激光器
磁场
电信
量子力学
激光束
计算机科学
天线(收音机)
作者
Ragib Shakil Rafi,Alessandro Salandrino
出处
期刊:Journal of The Optical Society of America B-optical Physics
[Optica Publishing Group]
日期:2022-11-07
卷期号:39 (12): 3296-3296
摘要
We present a numerical study of the linear and nonlinear diffraction and focusing properties of dielectric metasurfaces consisting of silicon microcylinder arrays resting on a silicon substrate. Upon diffraction, such structures lead to the formation of near-field intensity profiles that are reminiscent of photonic nanojets and propagate in a similar fashion. The generation and propagation of these photonic jets were analyzed under high intensity mid-infrared illumination conditions for which the third-order optical nonlinearity of silicon leads to pronounced self-focusing effects. The illumination wavelength of 3388 nm was selected to be below the two-photon absorption edge. Our results indicate that the Kerr nonlinear effect enhances light concentration throughout the generated photonic jet with an increase in intensity of about 20% compared to the linear regime for the power levels considered in this work. In all cases, the transverse beamwidth remains subwavelength, and the nonlinear effect reduces the full width half maximum size by 100 nm for both electric field intensity and the longitudinal Poynting vector.
科研通智能强力驱动
Strongly Powered by AbleSci AI