Giant intrinsic chiro-optical activity in planar dielectric nanostructures
AuthorsZhu, Alexander Y
Chen, Wei Ting
KAUST Grant NumberOSR-2016-CRG5-2995
Permanent link to this recordhttp://hdl.handle.net/10754/629741
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AbstractThe 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.
CitationZhu AY, Chen WT, Zaidi A, Huang Y-W, Khorasaninejad M, et al. (2017) Giant intrinsic chiro-optical activity in planar dielectric nanostructures. Light: Science & Applications 7: 17158. Available: http://dx.doi.org/10.1038/lsa.2017.158.
SponsorsThis work was supported in part by the Air Force Office of Scientific Research (MURI, Grant Nos FA9550-14-1-0389 and FA9550-16-1-0156) and Thorlabs Inc. We gratefully acknowledge financial support from King Abdullah University of Science and Technology under Award OSR-2016-CRG5-2995. AYZ thanks Harvard SEAS and A*STAR Singapore under the National Science Scholarship scheme. WTC acknowledges postdoctoral fellowship support from the Ministry of Science and Technology, Taiwan (Grant No. 104-2917-I-564-058). YWH and CWQ are supported by the National Research Foundation, Prime Minister’s Office, Singapore under its Competitive Research Program (CRP Award No. NRF-CRP15-2015-03). This work was performed in part at the Center for Nanoscale Systems (CNS), a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the National Science Foundation under NSF Award No. 1541959. CNS is a part of Harvard University.
JournalLight: Science & Applications