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
- Modeling the optical properties of twisted bilayer photonic crystals
- LSA 2021年10卷第9期页码：1672-1679
- 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
  中图分类号：
- 纸质出版日期：2021-09-30，
  
  网络出版日期：2021-07-29，
  
  收稿日期：2021-03-26，
  
  修回日期：2021-06-29，
  
  录用日期：2021-07-13
- Accepted：
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Modeling the optical properties of twisted bilayer photonic crystals[J]. LSA, 2021,10(9):1672-1679.

Tang, H. N. et al. Modeling the optical properties of twisted bilayer photonic crystals. Light: Science & Applications, 10, 1672-1679 (2021).
Modeling the optical properties of twisted bilayer photonic crystals[J]. LSA, 2021,10(9):1672-1679. DOI： 10.1038/s41377-021-00601-x.

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.

关键词

Keywords

references

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