Nonlinear Quasi-Bessel Beam Generation Based on the Time-domain Digital-Coding Metasurface

• 作者: 方祖琦 程强 崔铁军
• 来源期刊: 雷达学报
• 关键词: 时域数字编码超材料 贝塞尔波束 非线性调制
• 年，卷（期）: 2021,（2）
• 页码范围: 267-273
• 页数: 7页
• 分类号: TN820
• 语种: 英文
• DOI: 10.12000/JR21043

摘要

A quasi-Bessel beam is a type of nondiffracted beam commonly used in microwave and optical fields. Although numerous methods have been proposed for quasi-Bessel beam generation, they are valid only in linear systems, indicating that the generation of nonlinear quasi-Bessel beams remains a major challenge. Thus, we propose a new approach to produce quasi-Bessel beams at high-order harmonics based on the time-domain digital-coding metasurface, which is utilized to achieve accurate control of the phase profile at the nonlinear frequencies via proper coding strategies. The effect of phase discretization is also analyzed in detail. The simulation results confirm the validity of the proposed method, which provides a new approach for nonlinear beam manipulation.