Tunable dielectric metasurface upon using Nematic liquid crystals for color filter application

Mai Desouky; Mostafa Abdelsalam; Mohamed A. Swillam

doi:10.1117/12.2509632

19 April 2019 Tunable dielectric metasurface upon using Nematic liquid crystals for color filter application

Mai Desouky, Mostafa Abdelsalam, Mohamed A. Swillam

Proceedings Volume 10928, High Contrast Metastructures VIII; 109281T (2019) https://doi.org/10.1117/12.2509632
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

In the realm of intensive research on metamaterials, particularly, the two-dimensional analogue, known as metasurfaces have attracted researchers due to their lower losses, high efficiencies and low cost as compared to plasmonic metasurfaces. Dielectric metasurfaces (DMs) have been widely reported to experience magnetic and electric dipole Mie type resonances, in which, upon tuning these two resonances, dielectric metasurfaces can exhibit spatially varying optical responses, phases and polarizations of scattered fields. Recently, dielectric metasurfaces have been used for color printing application with very high color vibrancy. However, the fundamental building blocks essential for the realization of optical metasurfaces are designed with uniform dimension nano structures, resonating at particular wave length, thus printing image only with particular color. In order to be able to cover the whole optical regime, the metasurface needs to be designed with tunable optical response to be able to print images with multiple colors. In this work, we report a cubic TiO₂ metasurface which experience magnetic and electric dipole resonances in the optical regime. We are able to tune the reflection peak of both resonances using Nematic liquid crystal (LCs). LCs are anisotropic materials with controlled orientation based upon different applied voltages. Changing the orientation of the LC allows for tuning the resultant of the electric field component of the LC and thus the reflection peak of the metasurface can be tuned across the optical regime. We report a tunable DM for optical filters application using single dimension designed metausrfcae with efficiency close to 99 % covering three colors in the visible range: red, orange and green.

Citation Download Citation

Mai Desouky, Mostafa Abdelsalam, and Mohamed A. Swillam "Tunable dielectric metasurface upon using Nematic liquid crystals for color filter application", Proc. SPIE 10928, High Contrast Metastructures VIII, 109281T (19 April 2019); https://doi.org/10.1117/12.2509632

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available