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|Title:||Giant intrinsic chiro-optical activity in planar dielectric nanostructures||Authors:||Zhu, A.Y.
|Issue Date:||2018||Publisher:||Springer Nature||Citation:||Zhu, A.Y., Chen, W.T., Zaidi, A., Huang, Y.-W., Khorasaninejad, M., Sanjeev, V., Qiu, C.-W., Capasso, F. (2018). Giant intrinsic chiro-optical activity in planar dielectric nanostructures. Light: Science and Applications 7 (2) : 17158. ScholarBank@NUS Repository. https://doi.org/10.1038/lsa.2017.158||Rights:||Attribution 4.0 International||Abstract:||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. © 2018, The Author(s).||Source Title:||Light: Science and Applications||URI:||https://scholarbank.nus.edu.sg/handle/10635/210886||ISSN:||20955545||DOI:||10.1038/lsa.2017.158||Rights:||Attribution 4.0 International|
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