Universal active nonlocal metasurface with ultimate wavefront shaping performance

Mahmoud Elsawy; Stéphane Lanteri

doi:10.1117/12.3016605

11 June 2024 Universal active nonlocal metasurface with ultimate wavefront shaping performance

Mahmoud Elsawy, Stéphane Lanteri

Proceedings Volume PC12990, Metamaterials XIV; PC129900P (2024) https://doi.org/10.1117/12.3016605
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

In this work, we introduce an innovative and versatile design strategy that relies on asymmetric Gires-Tournois resonators to enable active full-phase modulation with nearly perfect efficiency. We investigated the complex frequency response of these resonators, identifying the necessary conditions for ideal phase/amplitude modulation response, where achieving unity reflection relies on specific zero-pole position in the complex plane. We explored various active metasurface materials, spanning from silicon to hetero-structured materials, enabling comprehensive phase modulation even with small refractive index changes on the order of 0.01. To address the strong nonlocal effect, we exploited our global statistical learning optimization to fine-tune the refractive index distribution. This optimization resulted in active wavefront shaping designs that surpass 90% in performance. This development holds significant promise for applications in advanced microscopy and LiDAR, pushing the boundaries of optical technology.

Conference Presentation

Citation Download Citation

Mahmoud Elsawy and Stéphane Lanteri "Universal active nonlocal metasurface with ultimate wavefront shaping performance", Proc. SPIE PC12990, Metamaterials XIV, PC129900P (11 June 2024); https://doi.org/10.1117/12.3016605

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