
1.John A. Paulson School of Engineering and Applied Science, Harvard University, Cambridge, MA 02138, USA
2.Department of Electrical and Computer Engineering, NationalUniversity of Singapore, Singapore 117583, Singapore
3.University of Waterloo, Waterloo, ON N2L 3G1, Canada
F Capasso, Email: capasso@seas.harvard.edu
Published:2018,
Published Online:23 February 2018,
Received:02 September 2017,
Revised:12 November 2017,
Accepted:12 November 2017
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Zhu, A. Y. et al. Giant intrinsic chiro-optical activity in planar dielectric nanostructures. Light: Science & Applications, 2, 17158 (2018).
Zhu, A. Y. et al. Giant intrinsic chiro-optical activity in planar dielectric nanostructures. Light: Science & Applications, 2, 17158 (2018). DOI: 10.1038/lsa.2017.158.
The strong optical chirality arising from certain synthetic metamaterials has important and widespread applications in polarization optics
stereochemistry and spintronics. However
these intrinsically chiral metamaterials are restricted to a complicated three-dimensional (3D) geometry
which leads to significant fabrication challenges
particularly at visible wavelengths. Their planar two-dimensional (2D) counterparts are limited by symmetry considerations to operation at oblique angles (extrinsic chirality) and possess significantly weaker chiro-optical responses close to normal incidence. Here
we address the challenge of realizing strong intrinsic chirality from thin
planar dielectric nanostructures. Most notably
we experimentally achieve near-unity circular dichroism with ~90% of the light with the chosen helicity being transmitted at a wavelength of 540 nm. This is the highest value demonstrated to date for any geometry in the visible spectrum. We interpret this result within the charge-current multipole expansion framework and show that the excitation of higher-order multipoles is responsible for the giant circular dichroism. These experimental results enable the realization of high-performance miniaturized chiro-optical components in a scalable manner at optical frequencies.
chiraldielectricextrinsic chiralitymetasurfaceoptical activity
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