4.6 Article

On-chip asymmetric beam-steering for broadband visible light

Journal

OPTICS LETTERS
Volume 47, Issue 2, Pages 369-372

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OL.443888

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Categories

Funding

  1. Hubei Province Funds for Distinguished Young Scientists [2021CFA043]
  2. Wuhan Municipal Science and Technology Bureau [2020010601012196]
  3. Recruitment Program of Global Experts [501100010871]
  4. Wuhan University [501100007046]

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This paper introduces a visible-frequency on-chip dual-layer design with cascading one-dimensional plasmonic metawires and metagratings, which effectively manipulates surface plasmon polariton wavefronts and exhibits on-chip asymmetric beam-steering functionality. The 1D metawires enable broadband beam-deflection on-chip with high conversion efficiency. The cascading plasmonic coupling between metawires/metagrating is crucial for on-chip plasmonic device development.
Artificial optical nanostructures including three-dimensional (3D) metamaterials and two-dimensional (2D) metasurfaces have shown overwhelming capability to control electromagnetic waves in desirable manners. However, the challenges of manufacturing a complex 3D bulk architecture or achieving nanoscale alignment between multilayers limit their practical applications, and they are unable to be used in on-chip integrated photonic devices. Therefore, the emerging dimensionality-reduction to on-chip metadevices would be of promising research value. Here, we propose a visible-frequency on-chip dual-layer design by cascading one-dimensional (1D) plasmonic metawires with metagratings, which can effectively manipulate surface plasmon polariton (SPP) wavefronts and exhibit on-chip asymmetric beam-steering functionality. Our 1D metawires consist of trapezoidal plasmonic nanoantennas and can enable broadband (460-700 nm) on-chip beam-deflection with a high conversion efficiency. The cascading plasmonic coupling between metawires/metagrating is further demonstrated with broadband asymmetric propagation performance, which is crucial for on-chip plasmonic device development. Finally, we study and theoretically verify a cascade system that integrates a dual-functional (convergent/divergent) lens for the forward/backward propagation, respectively. Compared with conventional free-space multilayer metasurfaces, on-chip 1D metawires enjoy single-time lithography processing and no alignment requirement for implementation in multifunctional devices. We believe that the proof-of-concept on-chip metawires study will pave a new, to the best of our knowledge, way for creating multifunctional photonic integrated devices and hold tremendous potential in realizing on-chip transformation optics, information processing, spectrometers, as well as optical sensors. (C) 2022 Optica Publishing Group

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