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https://doi.org/10.1038/lsa.2017.158
Title: | Giant intrinsic chiro-optical activity in planar dielectric nanostructures | Authors: | Zhu, A.Y. Chen, W.T. Zaidi, A. Huang, Y.-W. Khorasaninejad, M. Sanjeev, V. Qiu, C.-W. Capasso, F. |
Keywords: | chiral dielectric extrinsic chirality metasurface optical activity |
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 |
Appears in Collections: | Elements Staff Publications |
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