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Title: | Enantiomorphing Chiral Plasmonic Nanostructures: A Counterintuitive Sign Reversal of the Nonlinear Circular Dichroism | Authors: | Collins, Joel T. Zheng, Xuezhi Braz, Nuno V. S. SLENDERS, Eli Zu, Shuai Vandenbosch, Guy A. E. Moshchalkov, Victor V. Fang, Zheyu AMELOOT, Marcel Warburton, Paul A. Valev, Ventsislav K. |
Issue Date: | 2018 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | ADVANCED OPTICAL MATERIALS, 6(14) (Art N° 1800153) | Abstract: | Plasmonic nanostructures have demonstrated a remarkable ability to control light in ways never observed in nature, as the optical response is closely linked to their flexible geometric design. Due to lack of mirror symmetry, chiral nanostructures allow twisted electric field hotspots to form at the material surface. These hotspots depend strongly on the optical wavelength and nanostructure geometry. Understanding the properties of these chiral hotspots is crucial for their applications; for instance, in enhancing the optical interactions with chiral molecules. Here, the results of an elegant experiment are presented: by designing 35 intermediate geometries, the structure is enantiomorphed from one handedness to the other, passing through an achiral geometry. Nonlinear multiphoton microscopy is used to demonstrate a new kind of double-bisignate circular dichroism due to enantiomorphing, rather than wavelength change. From group theory, a fundamental origin of this plasmonic chiroptical response is proposed. The analysis allows the optimization of plasmonic chiroptical materials. | Notes: | [Collins, Joel T.; Valev, Ventsislav K.] Univ Bath, Ctr Photon & Photon Mat, Bath BA2 7AY, Avon, England. [Collins, Joel T.; Valev, Ventsislav K.] Univ Bath, Ctr Nanosci & Nanotechnol, Dept Phys, Bath BA2 7AY, Avon, England. [Zheng, Xuezhi; Vandenbosch, Guy A. E.] Katholieke Univ Leuven, ESAT TELEMIC, B-3001 Leuven, Belgium. [Braz, Nuno V. S.; Warburton, Paul A.] UCL, Elect Engn, Torrington Pl, London WC1E 7JE, England. [Braz, Nuno V. S.; Warburton, Paul A.] UCL, London Ctr Nanotechnol, 17-19 Gordon St, London WC1H 0AH, England. [Slenders, Eli; Ameloot, Marcel] Univ Hasselt, BE-3590 Diepenbeek, Belgium. [Slenders, Eli; Ameloot, Marcel] Transnat Univ Limburg, BIOMED, BE-3590 Diepenbeek, Belgium. [Zu, Shuai; Fang, Zheyu] Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China. [Zu, Shuai; Fang, Zheyu] Peking Univ, Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China. [Moshchalkov, Victor V.] Katholieke Univ Leuven, Lab Solid State Phys & Magnetism, Celestijnenlaan 200D, B-3001 Heverlee, Belgium. | Keywords: | chirality; chiroptical effects; metamaterials; nonlinear optics; plasmonic;chirality; chiroptical effects; metamaterials; nonlinear optics; plasmonic | Document URI: | http://hdl.handle.net/1942/28053 | ISSN: | 2195-1071 | e-ISSN: | 2195-1071 | DOI: | 10.1002/adom.201800153 | ISI #: | 000439490700017 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2019 |
Appears in Collections: | Research publications |
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Collins_et_al-2018-Advanced_Optical_Materials.pdf Restricted Access | Published version | 1.51 MB | Adobe PDF | View/Open Request a copy |
author version.pdf | Peer-reviewed author version | 3.08 MB | Adobe PDF | View/Open |
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