Overcoming intrinsic dispersion locking for achieving spatio-spectral selectivity with misaligned bilayer metagratings

Ze-Peng Zhuang; Xin Zhou; Hao-Long Zeng; Meng-Yu Li; Ze-Ming Chen; Xin-Tao He; Xiao-Dong Chen; Lei Zhou; Jian-Wen Dong

doi:10.1186/s43593-025-00092-y

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Overcoming intrinsic dispersion locking for achieving spatio-spectral selectivity with misaligned bilayer metagratings

eLight Vol. 5, (2025)

Research Article | Updated：2025-12-01

- Overcoming intrinsic dispersion locking for achieving spatio-spectral selectivity with misaligned bilayer metagratings
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- DOI：10.1186/s43593-025-00092-y
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- Received：21 February 2025，
  
  Revised：2025-05-19，
  
  Accepted：23 May 2025，
  
  Published Online：08 July 2025，
  
  Published：2025-12
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Ze-Peng Zhuang, Xin Zhou, Hao-Long Zeng, et al. Overcoming intrinsic dispersion locking for achieving spatio-spectral selectivity with misaligned bilayer metagratings[J]. eLight, 2025, 5.
DOI：

Ze-Peng Zhuang, Xin Zhou, Hao-Long Zeng, et al. Overcoming intrinsic dispersion locking for achieving spatio-spectral selectivity with misaligned bilayer metagratings[J]. eLight, 2025, 5. DOI： 10.1186/s43593-025-00092-y.

摘要

Abstract

Spatio-spectral selectivity

the capability to select a single mode with a specific wavevector (angle) and wavelength

is imperative for light emission and imaging.

Continuous

band dispersion of a conventional periodic structure

however

sets up an intrinsic locking between wavevectors and wavelengths of photonic modes

making it difficult to

single

out just one mode. Here

we show that the radiation asymmetry of a photonic mode can be explored to tailor the transmission/reflection properties of a photonic structure

based on Fano interferences between the mode and the background. In particular

we find that a photonic system supporting a band dispersion with certain angle-dependent radiation-directionality can exhibit Fano-like perfect reflection at a single frequency and a single incident angle

thus overcoming the dispersion locking and enabling the desired spatio-spectral selectivity. We present a phase diagram to guide designing angle-controlled radiation-directionality and experimentally demonstrate double narrow Fano-like reflection in angular (±5°) and wavelength (14 nm) bandwidths

along with high-contrast spatio-spectral selective imaging

using a misaligned bilayer metagrating with tens-of-nanometer-scale thin spacer. Our scheme promises new opportunities in applications in directional thermal emission

nonlocal beam shaping

augmented reality

precision bilayer nanofabrication

and biological spectroscopy.

关键词

Keywords

references

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