Symmetric accelerating beam generation via all-dielectric metasurfaces

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• Traditional generation of symmetric accelerating beams (SABs) relies on bulky optical components, limiting device miniaturization.
• Metasurfaces, engineered with sub-wavelength structures, offer a pathway to ultra-thin and flat optical devices.

Purpose of the Study:

• To design and simulate all-dielectric metasurfaces for efficient generation of symmetric accelerating beams (SABs).
• To explore the unique propagation characteristics and potential applications of metasurface-generated SABs.

Main Methods:

• Utilized an optical caustic approach for metasurface design.
• Employed spatial distribution of optimized niobium pentoxide (Nb2O5) nano-rods on a silicon dioxide (SiO2) substrate for phase modulation.
• Simulated the generation and propagation of SABs.

Main Results:

• Successfully designed and simulated all-dielectric metasurfaces capable of generating highly efficient SABs.
• Demonstrated that the generated SABs exhibit customizable propagation trajectories, symmetric intensity profiles, autofocusing, and needle-like structures.
• Showcased the ability of these SABs to avoid obstacles in their propagation path.

Conclusions:

• All-dielectric metasurfaces provide an effective platform for miniaturized SAB generation.
• Metasurface-generated SABs possess unique controllable features suitable for advanced optical applications.
• Potential applications include Raman spectroscopy, fluorescent imaging, and multiparticle manipulation.