Manipulating Dual Bound States in the Continuum for Efficient Spatial Light Modulator.
basic_science · Level V
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- Record sourced from PubMed, PMID 36475737.
- Also identified by DOI 10.1021/acs.nanolett.2c03539.
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Abstract
Spatial light modulators (SLMs) that could control diverse optical properties are highly demanded by many optoelectronic systems. Recently, the integration of nonlinear χ<sup>(2)</sup> materials and metasurfaces has been recognized as a promising strategy for next-generation SLMs. However, their modulation efficiency still encounters challenges due to low quality factor and weak light-matter interaction. Here, we demonstrate an efficient SLM by manipulating the dual bound state in continuum (BIC) with the assistance of a binary-pore anodic alumina oxide template technique. The coexistence of symmetry-protected BIC and Fabry-Pérot BIC is obtained by a desirable sandwich configuration with a BIC metasurface and EO polymer, which efficiently restrain radiative loss and generate a strong quasi-BIC resonance. The assembled SLM with large absorption and <i>Q-</i>factor delivers a modulation depth of 77% and an <i>f</i><sub>3 dB</sub> of nearly 100 MHz. This dual BIC metasurface provides potential for applications including switches, LIDAR, augmented and virtual reality, and so on.