Effects of Fano Resonance on Optical Chirality of Planar Plasmonic Nanodevices

Hwang, Y, Lee, S, Kim, S, Lin, J and Yuan, X 2018, 'Effects of Fano Resonance on Optical Chirality of Planar Plasmonic Nanodevices', ACS Photonics, vol. 5, no. 11, pp. 4538-4544.

Document type: Journal Article
Collection: Journal Articles

Title Effects of Fano Resonance on Optical Chirality of Planar Plasmonic Nanodevices
Author(s) Hwang, Y
Lee, S
Kim, S
Lin, J
Yuan, X
Year 2018
Journal name ACS Photonics
Volume number 5
Issue number 11
Start page 4538
End page 4544
Total pages 7
Publisher American Chemical Society
Abstract The effects of Fano resonance on the optical chirality of planar plasmonic nanodevices in the visible wavelength range are experimentally observed and theoretically explained. The nanodevice consists of a nanodisk at the center with surrounding six gold nanorods with an orientation angle to exhibit optical chirality under dark-field illumination. The chiral response induced by the gold nanorods is affected by the presence of the nanodisk with different diameters which causes Fano resonance of different coupling strength. An intriguing change to the opposite selection preference of different handedness of the circularly polarized light has been clearly observed experimentally. This change of the preference is understood based on the coupled localized surface plasmon model. Moreover, electrostatic analysis and the time-dependent simulations provide a further understanding of the phenomenon. The observed and understood effects of Fano resonance on optical chirality enables effective manipulation of chiral characteristics of planar subwavelength nanodevices.
Subject Nanophotonics
Photonics, Optoelectronics and Optical Communications
Keyword(s) plasmonics
Fano resonance
subwavelength optics
flat optics
dark-field scattering
DOI - identifier 10.1021/acsphotonics.8b01007
Copyright notice © 2018 American Chemical Society
ISSN 2330-4022
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