Inverse design and optical vortex manipulation for thin-film absorption enhancement
Author:
Bae Munseong12ORCID, Jo Jaegang2, Lee Myunghoo3, Kang Joonho2, Boriskina Svetlana V.1, Chung Haejun4ORCID
Affiliation:
1. Department of Mechanical Engineering , Massachusetts Institute of Technology (MIT) , Cambridge , MA 02139 , USA 2. Department of Electronic Engineering , Hanyang University , Seoul , 04763 , South Korea 3. Department of Physics and Department of Electronic Engineering , Hanyang University , Seoul , 04763 , South Korea 4. Department of Electronic Engineering and Department of Artificial Intelligence , Hanyang University , Seoul , 04763 , South Korea
Abstract
Abstract
Optical vortices (OVs) have rapidly varying spatial phase and optical energy that circulates around points or lines of zero optical intensity. Manipulation of OVs offers innovative approaches for various fields, such as optical sensing, communication, and imaging. In this work, we demonstrate the correlation between OVs and absorption enhancement in two types of structures. First, we introduce a simple planar one-dimensional (1D) structure that manipulates OVs using two coherent light sources. The structure shows a maximum of 6.05-fold absorption gap depending on the presence of OVs. Even a slight difference in the incidence angle can influence the generation/annihilation of OVs, which implies the high sensitivity of angular light detection. Second, we apply inverse design to optimize two-dimensional (2D) perfect ultrathin absorbers. The optimized free-form structure achieves 99.90 % absorptance, and the fabricable grating structure achieves 97.85 % at 775 nm wavelength. To evaluate OV fields and their contribution to achieving absorption enhancement, we introduce a new parameter, OV circularity. The optimized structures generate numerous OVs with a maximum circularity of 95.37 % (free-form) and 96.14 % (grating), superior to our 1D structure. Our study reveals the role of high-circularity localized OVs in optimizing nano-structured absorbers and devices for optical sensing, optical communication, and many other applications.
Funder
Korea Semiconductor Research Consortium Korea Evaluation Institute of Industrial Technology Institute for Information and Communications Technology Promotion Ministry of Science and ICT, South Korea National Research Foundation of Korea
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
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