High transmission efficiency colour filters based on hybrid metal-dielectric metasurfaces

Amr Soliman; Calum Williams; Tim Wilkinson

doi:10.1117/12.2656694

15 March 2023 High transmission efficiency colour filters based on hybrid metal-dielectric metasurfaces

Amr Soliman, Calum Williams, Tim Wilkinson

Proceedings Volume 12431, Photonic and Phononic Properties of Engineered Nanostructures XIII; 1243109 (2023) https://doi.org/10.1117/12.2656694
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

High transmission efficiency and ultrathin color filter arrays are highly desirable for next-generation display and imaging technologies. Metallic (plasmonic) and all-dielectric metasurfaces can be utilized for structural color generation through the excitation of strong electric and magnetic dipoles resonances at the nanoscale. However, plasmonic metasurfaces experience high ohmic losses and spectrally broad responses, reducing the optical efficiency and saturation of the generated color. All-dielectric metasurfaces exhibit lower field enhancement, a low-quality factor, and cross -talk due to the excitation of multiple spectrally overlapping modes. Hybrid metal-dielectric metasurfaces have recently emerged as a mean to combine the advantages of both plasmonic and all-dielectric metasurfaces, while mitigating their disadvantages. In this work, we present three different colour filters (red, green, blue) based on hybrid metal-dielectric metasurfaces that exhibit high transmission efficiencies (≈80 %). The hybrid filters are composed of nanostructured titanium dioxide atop of aluminium cylinders. Through finite-difference-time-domain simulations, we show that the response arises because of the hybridization of electric-magnetic dipole modes. The hybrid approach reduces high ohmic absorption losses (plasmonic) and low field enhancement (all-dielectric), resulting in higher transmission efficiencies.

Conference Presentation

Citation Download Citation

Amr Soliman, Calum Williams, and Tim Wilkinson "High transmission efficiency colour filters based on hybrid metal-dielectric metasurfaces", Proc. SPIE 12431, Photonic and Phononic Properties of Engineered Nanostructures XIII, 1243109 (15 March 2023); https://doi.org/10.1117/12.2656694

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