Accelerating beam generation via all-dielectric metasurfaces

Nazmi Yilmaz; Fehim T. Bagci; Ahmet Ozer; Hamza Kurt

doi:10.1117/12.2520971

30 April 2019 Accelerating beam generation via all-dielectric metasurfaces

Nazmi Yilmaz, Fehim T. Bagci, Ahmet Ozer, Hamza Kurt

Proceedings Volume 11025, Metamaterials XII; 110250K (2019) https://doi.org/10.1117/12.2520971
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

All-dielectric metasurfaces are unique component to control optical wavefront with high transmission or reflection coefficient. Recently, accelerating beam, which propagates along curved arbitrary trajectories, has been realized with conventional diffractive optical elements (DOE). However, DOE suffer from low sampling ratio of rapid phase gradients and its diffraction efficiency drops quickly when the wavelength is switched to another wavelength which is different than the designed wavelength.. In this study, we show accelerating beam which is generated by highly efficient and polarization insensitive all-dielectric metasurfaces in the visible wavelength. The acceleration beam is numerically generated with the proposed metasurfaces which are composed of TiO₂ nanopillars residing on glass substrate using finite difference time-domain computational method. It is shown that this beam has the ability to propagate curved trajectories in air medium. Transmission efficiency of the proposed structure is above 65% and desired arbitrary trajectories have been achieved. Generating highly efficient accelerating beam can be used in photonic applications in optical imaging, spectroscopy, optical micromanipulation and nonlinear optics.

Citation Download Citation

Nazmi Yilmaz, Fehim T. Bagci, Ahmet Ozer, and Hamza Kurt "Accelerating beam generation via all-dielectric metasurfaces", Proc. SPIE 11025, Metamaterials XII, 110250K (30 April 2019); https://doi.org/10.1117/12.2520971

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KEYWORDS

Beam propagation method

Diffractive optical elements

Free space

Nanorods

Wave propagation

Control systems

Dielectric polarization

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