Method for generating real space and K space Airy beam array based on metasurface

Abstract

The invention discloses a method for generating real space and K space Airy beam arrays based on a metasurface, and belongs to the field of micro-nano optics. The method comprises the following steps: performing analog calculation on the nano antenna by adopting a simulation method, accurately and effectively regulating and controlling the propagation distance and the propagation track of an emergent Airy beam by adjusting the size and azimuth angle distribution of a nano column array, and selecting to obtain the nano antenna meeting the metasurface composition requirement; after the geometric dimensions of the nano-column units are determined, obtaining the dimensions and azimuth angle distribution of the nano-column arrays covering 0-2pi phases according to a phase distribution algorithm for generating real space and K space Airy beam arrays, i.e., determining the dimensions and rotation angles of each nano-column unit, and coding and generating a processing file of a corresponding medium metasurface structure; processing the broadband medium metasurface by utilizing a processing file and adopting a micro-nano processing technology; when different circularly polarized light beams are incident, obtaining Airy beam arrays in a real space and a K space, thereby improving the parallel working efficiency of the device remarkably.

Description

technical field [0001] The invention relates to a method for generating an Airy beam array, in particular to a method for generating a real-space and K-space Airy beam array based on a broadband dielectric metasurface independently encoded by dual circular channels, and belongs to the field of micro-nano optics. Background technique [0002] As a kind of non-diffraction beam, the Airy beam has very attractive characteristics such as non-diffraction, self-acceleration, and self-recovery when transmitted in free space. Unlike Bessel beams, Airy beams do not rely on a simple conical superposition of plane waves, although they are both defined as unscattered light. Since Berry and Balazs predicted in the field of quantum mechanics that the Schrödinger equation would have a wave packet solution that satisfies the Airy function, researchers have found that the Airy function characterized by an exponential "cutoff" is also a solution to the Schrödinger equation, and for the first t...

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Problems solved by technology

And some of these methods, such as mechanical modulation, usually make the power generation system very complex

Other methods are not suitable for optical micromanipulation due to bulky light modulators

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