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Manipulating Dual Bound States in the Continuum for Efficient Spatial Light Modulator.

Xinyu Sun1,2, Jiacheng Sun2,3, Zichen Wang2,3

  • 1College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310027, China.

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|December 8, 2022
PubMed
Summary

This study presents an efficient spatial light modulator (SLM) using dual bound states in the continuum (BICs) within a metasurface. This innovation enhances modulation depth and speed for advanced optical applications.

Keywords:
binary plasmonic arraybinary-pore anodic aluminum oxide templatebound states in the continuummetasurfacespatial light modulator

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Area of Science:

  • Optoelectronics
  • Metamaterials
  • Nonlinear Optics

Background:

  • Spatial light modulators (SLMs) are crucial for optoelectronic systems, requiring control over optical properties.
  • Integrating nonlinear materials with metasurfaces offers a path to next-generation SLMs.
  • Current limitations include low modulation efficiency due to poor quality factors and weak light-matter interactions.

Purpose of the Study:

  • To demonstrate an efficient SLM by manipulating dual bound states in the continuum (BICs).
  • To overcome the efficiency challenges in current nonlinear metasurface-based SLMs.

Main Methods:

  • Utilized a binary-pore anodic alumina oxide template technique to create a BIC metasurface.
  • Engineered a sandwich configuration with the BIC metasurface and an electro-optic (EO) polymer.
  • Achieved coexistence of symmetry-protected BIC and Fabry-Pérot BIC to enhance light-matter interaction and reduce radiative loss.

Main Results:

  • Demonstrated a strong quasi-BIC resonance with significantly restrained radiative loss.
  • Achieved a high modulation depth of 77% in the assembled SLM.
  • Obtained a fast response time with an f3dB approaching 100 MHz and a large quality factor.

Conclusions:

  • The dual BIC metasurface approach offers a promising strategy for high-efficiency SLMs.
  • The developed SLM exhibits excellent performance metrics, including modulation depth and speed.
  • This technology has potential applications in switches, LIDAR, and augmented/virtual reality systems.