Spin-preserving chiral photonic crystal mirror

Behrooz Semnani; Jeremy Flannery; Rubayet Al Maruf; Michal Bajcsy

doi:10.1038/s41377-020-0256-5

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Spin-preserving chiral photonic crystal mirror

Article

- Spin-preserving chiral photonic crystal mirror
- Spin-preserving chiral photonic crystal mirror
- LSA 2020年9卷第1期页码：197-208
- Affiliations：
  
  1.Institute for Quantum Computing (IQC), University of Waterloo, Waterloo N2L3G1 ON, Canada
  2.Department of Physics and Astronomy, University of Waterloo, Waterloo N2L3G1 ON, Canada
  3.Department of Electrical & Computer Engineering, University of Waterloo, Waterloo N2L3G1 ON, Canada
- Author bio：
  
  Behrooz Semnani (bsemnani@uwaterloo.ca)
- Funds：
- DOI：10.1038/s41377-020-0256-5
  中图分类号：
- 纸质出版日期：2020，
  
  网络出版日期：2020-02-20，
  
  收稿日期：2019-08-27，
  
  修回日期：2020-01-16，
  
  录用日期：2020-01-27
- Accepted：
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Spin-preserving chiral photonic crystal mirror[J]. LSA, 2020,9(1):197-208.

Semnani, B. et al. Spin-preserving chiral photonic crystal mirror. Light: Science & Applications, 9, 197-208 (2020).
Spin-preserving chiral photonic crystal mirror[J]. LSA, 2020,9(1):197-208. DOI： 10.1038/s41377-020-0256-5.

Semnani, B. et al. Spin-preserving chiral photonic crystal mirror. Light: Science & Applications, 9, 197-208 (2020). DOI： 10.1038/s41377-020-0256-5.

摘要

Abstract

Chirality refers to a geometric phenomenon in which objects are not superimposable on their mirror image. Structures made of nanoscale chiral elements can exhibit chiroptical effects

such as dichroism for left- and right-handed circularly polarized light

which makes these structures highly suitable for applications ranging from quantum information processing and quantum optics to circular dichroism spectroscopy and molecular recognition. At the same time

strong chiroptical effects have been challenging to achieve even in synthetic optical media

and chiroptical effects for light with normal incidence have been speculated to be prohibited in thin

lossless quasi-two-dimensional structures. Here

we report an experimental realization of a giant chiroptical effect in a thin monolithic photonic crystal mirror. Unlike conventional mirrors

our mirror selectively reflects only one spin state of light while preserving its handedness

with a near-unity level of circular dichroism. The operational principle of the photonic crystal mirror relies on guided-mode resonance (GMR) with a simultaneous excitation of leaky transverse electric (TE-like) and transverse magnetic (TM-like) Bloch modes in the photonic crystal slab. Such modes are not reliant on the suppression of radiative losses through long-range destructive interference

and even small areas of the photonic crystal exhibit robust circular dichroism. Despite its simplicity

the mirror strongly outperforms earlier reported structures and

contrary to a prevailing notion

demonstrates that near-unity reflectivity contrast for opposite helicities is achievable in a quasi-two-dimensional structure.

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references

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