Multi-colour reflective metagrating with neutral transparency for augmented reality

作     者：Magno, Giovanni Dagens, Beatrice D'Orazio, Antonella Gauthier-Lafaye, Olivier 

作者机构：Polytech Univ Bari Dept Elect & Informat Engn DEI Bari Italy Univ Paris Saclay Ctr Nanosci & Nanotechnol CNRS Palaiseau France Univ Toulouse LAAS INSA UPSCNRS Toulouse France 

出 版 物：《OPTICS EXPRESS》 (Opt. Express)

年 卷 期：2024年第32卷第15期

页      面：25545-25559页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：Regione Puglia 

主　　题：Diffraction gratings Effective refractive index Near eye displays Optical elements Optical systems Waveguide modes 

摘      要：This paper presents the design and experimental validation of an all-dielectric and transparent metagrating-based metalens. Leveraging multiple guided mode resonances simultaneously, the metagrating enables the generation of two or more spectrally narrow reflection peaks. These peaks are achieved through the precise engineering of guided mode resonances, allowing for the reflection of a comb of vibrant and saturated colours. In addition to the investigation of underlying mechanisms, we introduce an analytical numerical method that facilitates rapid engineering of the spectral positions of the reflection peak comb. Experimental validation is provided for a bichromatic sample. Such metagrating can be promising for augmented reality systems, supporting individuals with mild to moderate cognitive impairments by delivering visual and textual stimuli that can improve indoor navigation, home safety, communication, and decision-making. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement