摘要
准贝塞尔光束是一种广泛应用于微波和光学领域中的非衍射波束。虽然有许多生成准贝塞尔波束的方法被提出,但它们只应用于线性系统中,因此非线性准贝塞尔波束的生成仍然是一个重大的挑战。为此,作者提出了一种基于时域数字编码超表面的高次谐波上的准贝塞尔光束产生方法,通过适当的编码方案实现对非线性频率分量上的超表面相位分布的精确控制,并详细分析了相位离散化对贝塞尔波束形成造成的影响。仿真结果验证了该方法的有效性,并为非线性波束生成提供了一条新的路径。
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.
作者
方祖琦
程强
崔铁军
FANG Zuqi;CHENG Qiang;CUI Tiejun(State Key Laboratory of Millimeter Waves,Southeast University,Nanjing 211189,China)
出处
《雷达学报（中英文）》
CSCD
北大核心
2021年第2期267-273,共7页
Journal of Radars
基金
The National Key Research and Development Program of China(2017YFA0700201)
The National Natural Science Foundation of China(61890544)。
关键词
时域数字编码超材料
贝塞尔波束
非线性调制
Time-domain digital coding metasurface
Bessel beam
Nonlinear modulation
