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Reciprocal metasurfaces for on-axis reflective optical computing

Momeni, A ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1109/TAP.2021.3078521
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2021
  4. Abstract:
  5. Analog computing has emerged as a promising candidate for real-time and parallel continuous data processing. This article presents a reciprocal way for realizing asymmetric optical transfer functions (OTFs) in the reflection side of the on-axis processing channels. It is rigorously demonstrated that the presence of cross-polarization exciting normal polarizabilities (CPENPs) of a reciprocal metasurface circumvents the famous challenge of Green's function approach in implementation of on-axis reflective optical signal processing while providing dual computing channels under orthogonal polarizations. Following a comprehensive theoretical discussion and as a proof of concept, an all-dielectric optical metasurface is elaborately designed to exhibit the desired surface polarizabilities, thereby reflecting the first derivative and extracting the edges of images impinging from the normal direction. The proposed study offers a flexible design method for on-axis metasurface-based optical signal processing and also dramatically facilitates the experimental setup required for ultrafast analog computation and image processing. © 1963-2012 IEEE
  6. Keywords:
  7. Analog computers ; Data handling ; Green computing ; Image processing ; Optical data processing ; Optical transfer function ; Orthogonal functions ; Polarization ; Analog computation ; Cross polarizations ; First derivative ; Flexible designs ; Orthogonal polarizations ; Polarizabilities ; Processing channels ; Proof of concept ; Optical signal processing
  8. Source: IEEE Transactions on Antennas and Propagation ; Volume 69, Issue 11 , 2021 , Pages 7709-7719 ; 0018926X (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/9431694