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Spin-preserving chiral photonic crystal mirror
Behrooz Semnani1,2, Jeremy Flannery1,3, Rubayet Al Maruf1,2
11Institute for Quantum Computing (IQC), University of Waterloo, Waterloo, N2L3G1 ON Canada.
Light, Science & Applications
|March 6, 2020
Summary
Researchers developed a novel photonic crystal mirror demonstrating a giant chiroptical effect. This chiral mirror selectively reflects one light spin state, achieving near-unity circular dichroism for enhanced optical applications.
Area of Science:
- Photonics and optical metamaterials
- Quantum optics and information processing
- Nanotechnology and chiral structures
Background:
- Chirality is a geometric property where objects are non-superimposable on their mirror images.
- Nanoscale chiral structures exhibit chiroptical effects like circular dichroism, crucial for advanced optical applications.
- Achieving strong chiroptical effects, especially in thin structures, has been a significant challenge in optical research.
Purpose of the Study:
- To experimentally realize a giant chiroptical effect in a novel thin monolithic photonic crystal mirror.
- To overcome the limitations of previous structures and prevailing notions regarding chiroptical effects in quasi-two-dimensional systems.
- To demonstrate a device capable of selective light reflection based on spin state and handedness.
Main Methods:
- Fabrication of a thin monolithic photonic crystal mirror.
- Utilizing guided-mode resonance (GMR) within the photonic crystal slab.
- Simultaneous excitation of leaky transverse electric (TE-like) and transverse magnetic (TM-like) Bloch modes.
Main Results:
- Experimental realization of a giant chiroptical effect with near-unity circular dichroism.
- The photonic crystal mirror selectively reflects one spin state of light while preserving its handedness.
- Robust circular dichroism observed even in small areas of the photonic crystal, outperforming previous structures.
Conclusions:
- The developed photonic crystal mirror offers a significant advancement in achieving strong chiroptical effects.
- Contrary to prior speculation, near-unity reflectivity contrast for opposite helicities is achievable in quasi-two-dimensional structures.
- The device's operational principle based on GMR provides a robust platform for applications in quantum optics and sensing.
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