Journal
NANO LETTERS
Volume 17, Issue 11, Pages 7102-7109Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b03882
Keywords
Metamaterials; chirality; circular dichroism; nonlinear optics; optical activity
Categories
Funding
- National Science Foundation [ECCS-1609567]
- Office of Naval Research [N00014-17-1-2555, N00014-16-1-2409]
- Air Force Research Laboratory through Azimuth [238-5404-GIT]
- Samsung Global Research Outreach (GRO) Program
- National Science Foundation (NSF) [DGE-1650044]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1609567] Funding Source: National Science Foundation
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Conventional metallic mirrors flip the spin of a circularly polarized wave upon normal incidence by inverting the direction of the propagation vector. Altering or maintaining the spin state of light waves carrying data is a critical need to be met at the brink of photonic information processing. In this work, we report a chiral metamaterial mirror that strongly absorbs a circularly polarized wave of one spin state and reflects that of the opposite spin in a manner conserving the circular polarization. A circular dichroic response in reflection as large as similar to 0.5 is experimentally observed in a near-infrared wavelength band. By imaging a fabricated pattern composed of the enantiomeric unit cells, we directly visualize the two key features of our engineered meta-mirrors, namely the chiral-selective absorption and the polarization preservation upon reflection. Beyond the linear regime, the chiral resonances enhance light-matter interaction under circularly polarized excitation, greatly boosting the ability of the metamaterial to perform chiral-selective signal generation and optical imaging in the nonlinear regime. Chiral meta-mirrors, exhibiting giant chiroptical responses and spin-selective near-field enhancement, hold great promise for applications in polarization sensitive electro-optical information processing and biosensing.
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