Modeling the optical properties of twisted bilayer photonic crystals

Haoning Tang; Fan Du; Stephen Carr; Clayton DeVault; Olivia Mello; Eric Mazur

doi:10.1038/s41377-021-00601-x

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Modeling the optical properties of twisted bilayer photonic crystals

Articles

- Modeling the optical properties of twisted bilayer photonic crystals
- Light: Science & Applications Vol. 10, Issue 9, Pages: 1672-1679(2021)
- Affiliations：
  
  1.School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
  2.Brown Theoretical Physics Center and Department of Physics, Brown University, Providence, RI, 02912, USA
- Author bio：
  
  Eric Mazur (mazur@seas.harvard.edu)
- Funds：
- DOI：10.1038/s41377-021-00601-x
  CLC：
- Published：30 September 2021，
  
  Published Online：29 July 2021，
  
  Received：26 March 2021，
  
  Revised：29 June 2021，
  
  Accepted：13 July 2021
- Accepted：
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Tang, H. N. et al. Modeling the optical properties of twisted bilayer photonic crystals. Light: Science & Applications, 10, 1672-1679 (2021).
DOI：

Tang, H. N. et al. Modeling the optical properties of twisted bilayer photonic crystals. Light: Science & Applications, 10, 1672-1679 (2021). DOI： 10.1038/s41377-021-00601-x.

摘要

Abstract

We demonstrate a photonic analog of twisted bilayer graphene that has ultra-flat photonic bands and exhibits extreme slow-light behavior. Our twisted bilayer photonic device

which has an operating wavelength in the C-band of the telecom window

uses two crystalline silicon photonic crystal slabs separated by a methyl methacrylate tunneling layer. We numerically determine the magic angle using a finite-element method and the corresponding photonic band structure

which exhibits a flat band over the entire Brillouin zone. This flat band causes the group velocity to approach zero and introduces light localization

which enhances the electromagnetic field at the expense of bandwidth. Using our original plane-wave continuum model

we find that the photonic system has a larger band asymmetry. The band structure can easily be engineered by adjusting the device geometry

giving significant freedom in the design of devices. Our work provides a fundamental understanding of the photonic properties of twisted bilayer photonic crystals and opens the door to the nanoscale-based enhancement of nonlinear effects.

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references

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