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Birefringence-Induced Modulation of Optical Activity in Chiral Plasmonic Helical Arrays

Title
Birefringence-Induced Modulation of Optical Activity in Chiral Plasmonic Helical Arrays
Author
염봉준
Keywords
RECENT PROGRESS; NANOSTRUCTURES
Issue Date
2017-04
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v. 8, no. 8, page. 1872-1877
Abstract
Chiral nanomaterials are characterized by handedness morphology on the nanoscale, manifested as preferential interaction with circularly polarized light. However, the origin of this light-matter interaction remains elusive. Here we simulated a model of chiral helical arrays of plasmonic nanoparticles with central anisotropic nanopillars to examine the effect of birefringence on the collective chiroptical response. Contrary to typical assumptions in previous works, we varied the biaxial refractive indices of the central nanopillars and observed a significant modulation of optical activity by calculating and characterizing circular dichroism (CD) spectra. The chiroptical response exhibited a sign change compared with that of the isotropic condition in a specific parametric range of negative birefringence. In addition, the CD peak increased by 3 to 16 as the ordinary refractive index increased from 1.5 to 3.0. These results are likely to be useful for designing chiral nanomaterials for applications in metamaterials, biosensors, and optoelectrical devices.
URI
https://pubs.acs.org/doi/10.1021/acs.jpclett.7b00521https://repository.hanyang.ac.kr/handle/20.500.11754/113868
ISSN
1948-7185
DOI
10.1021/acs.jpclett.7b00521
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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