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Analog optical computing based on a dielectric meta-reflect array

Chizari, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1364/OL.41.003451
  3. Publisher: OSA - The Optical Society
  4. Abstract:
  5. In this Letter, we realize the concept of analog computing using an engineered gradient dielectric meta-reflect-array. The proposed configuration consists of individual subwavelength silicon nanobricks, in combination with a fused silica spacer and silver ground plane, realizing a reflection beam with full phase coverage of 2π degrees, as well as an amplitude range of 0 to 1. Spectrally overlapping electric and magnetic dipole resonances, such high-index dielectric metasurfaces can locally and independently manipulate the amplitude and phase of the incident electromagnetic wave. This practically feasible structure overcomes substantial limitations imposed by plasmonic metasurfaces such as absorption losses and low polarization conversion efficiency in the visible range. Using such CMOS-compatible and easily integrable platforms promises highly efficient ultra-thin planar wave-based computing systems that circumvent the drawbacks of conventional bulky lens-based signal processors. Based on these key properties and the general concept of spatial Fourier transformation, we design and realize broadband mathematical operators such as the differentiator and integrator in the telecommunication wavelengths
  6. Keywords:
  7. Electromagnetic waves ; Fourier transforms ; Mathematical operators ; Mathematical transformations ; Optical data processing ; Signal processing ; Absorption loss ; Analog computing ; Computing system ; Fourier transformations ; Magnetic dipole ; Polarization conversion ; Signal processor ; Telecommunication wavelengths ; Fused silica
  8. Source: Optics Letters ; Volume 41, Issue 15 , 2016 , Pages 3451-3454 ; 01469592 (ISSN)
  9. URL: https://www.osapublishing.org/ol/abstract.cfm?uri=ol-41-15-3451