Open AccessGiant circular dichroism induced by tunable resonance in twisted Z-shaped nanostructure
Author(s) -
Yu Qu,
Huang Lishun,
Li Wang,
Zhongyue Zhang
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.005480
Subject(s) - nanorod , circular polarization , excitation , circular dichroism , nanostructure , resonance (particle physics) , optics , excited state , magnetic circular dichroism , materials science , surface plasmon resonance , physics , nanotechnology , crystallography , chemistry , atomic physics , spectral line , nanoparticle , quantum mechanics , microstrip , astronomy
Circular dichroism (CD) is useful in molecular chemistry, pharmaceuticals, and bio-sensing. In this paper, twisted Z-shaped nanostructure (TZN) is proposed to achieve giant CD. The TZN is composed of three vertical and twisted nanorods. Given that the resonance of vertical nanorod is only observable for left circularly polarized light excitation but is subdued for right circularly polarized light excitation, which leads to the giant CD effect approaching 88%. The subdued resonance of vertical nanorod can be excited by rotating the bottom nanorod. The CD properties can be tuned by the length of nanorods and the gap between them. These results would guide the design of plasmonic chiral nanostructures for achieving giant CD effect.
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