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Updated: Oct 12, 2025
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Circular dichroism metamirror with diversified chiral molecules combinations
Optics Express
|November 23, 2021
Summary
We developed a chiral metamirror for differential absorption of circularly polarized (CP) waves. This novel device exhibits distinct narrow-band and broadband absorption for left-handed (LCP) and right-handed (RCP) waves, respectively.
Area of Science:
- Metamaterials
- Chirality
- Optical Physics
Background:
- Circular dichroism (CD) is crucial for analyzing chiral molecules.
- Existing chiral metamaterials often lack efficient, multi-band spin-selective absorption.
Purpose of the Study:
- To propose and demonstrate a giant chiral metamirror with high-efficiency absorptive CD.
- To achieve differential absorption of left-handed circularly polarized (LCP) and right-handed circularly polarized (RCP) waves across dual/multi bands.
Main Methods:
- Designing a unit cell with two vertically aligned resonators with counter split openings and different eigenfrequencies.
- Investigating optical resonator designs with chiral molecules and parameter scanning.
- Analyzing power loss distributions to understand the mechanism of absorptive CD.
Main Results:
- The proposed chiral metamirror exhibits narrow-band LCP absorption at lower resonance and broadband RCP absorption at higher frequencies.
- Demonstrated realization of mid-infrared chiral metamirrors with spin-dependent absorption based on a microwave model.
- Confirmed that permutation symmetry breakdown in chiral molecules is key to absorptive CD.
Conclusions:
- The developed chiral metamirror offers multi-polarization and multi-function responses.
- This technology advances novel photonic devices for applications in CP lasers, biomolecule detection, and energy harvesting.
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