Revealing local origin of surface-enhanced circular dichroism

Seok Jae Yoo, Seojoo Lee, Q Han Park

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present a theory of the microscopic origins of the surface-enhanced circular dichroism (CD) with nanostructures. Recently, nanostructures and metamaterials have been used for the enhancement of CD signals of chiral molecules. However, the complete description of microscopic origins of the surface-enhanced circular dichroism (CD) has never been achieved. We find the total CD signals of the nanostructure coupled to chiral molecules can be decomposed into two factors: The induced and inherent CD. The inherent CD comes from the molecular absorption which can be enhanced by the strongly localized optical helicity density of resonant near-fields near the nanostructure. The induced CD is originated from the asymmetric absorption of light inside the nanostructure perturbed by nearby chiral molecules upon two opposite circularly polarized light. The recent surge of interest in the surface-enhanced CD spectroscopy has been inspired by the inherent CD enhancement, but our work shows that the induced CD can significantly contribute to the total CD signal of the chiral molecule/nanostructure coupled system. Using an example of gold nanodisk arrays, we demonstrate that the inherent and induced CD can compete with each other in plasmonic nanostructures. In this presentation, we also provide design principles for CD sensor using nanostructures and metamaterials.

Original languageEnglish
Title of host publicationPlasmonics in Biology and Medicine XV
PublisherSPIE
Volume10509
ISBN (Electronic)9781510615038
DOIs
Publication statusPublished - 2018 Jan 1
EventPlasmonics in Biology and Medicine XV 2017 - San Francisco, United States
Duration: 2017 Jan 292017 Jan 29

Other

OtherPlasmonics in Biology and Medicine XV 2017
CountryUnited States
CitySan Francisco
Period17/1/2917/1/29

Fingerprint

Dichroism
Circular Dichroism
dichroism
Nanostructures
Molecules
Metamaterials
Circular dichroism spectroscopy
Density (optical)
molecules
Light polarization
Gold
Light
molecular absorption
augmentation
optical density
polarized light
Sensors
Spectrum Analysis
near fields

Keywords

  • biosensing
  • chiral molecule
  • circular dichroism
  • metamaterials
  • optical chirality
  • plasmonics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

Cite this

Yoo, S. J., Lee, S., & Park, Q. H. (2018). Revealing local origin of surface-enhanced circular dichroism. In Plasmonics in Biology and Medicine XV (Vol. 10509). [105090A] SPIE. https://doi.org/10.1117/12.2286900

Revealing local origin of surface-enhanced circular dichroism. / Yoo, Seok Jae; Lee, Seojoo; Park, Q Han.

Plasmonics in Biology and Medicine XV. Vol. 10509 SPIE, 2018. 105090A.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Yoo, SJ, Lee, S & Park, QH 2018, Revealing local origin of surface-enhanced circular dichroism. in Plasmonics in Biology and Medicine XV. vol. 10509, 105090A, SPIE, Plasmonics in Biology and Medicine XV 2017, San Francisco, United States, 17/1/29. https://doi.org/10.1117/12.2286900
Yoo SJ, Lee S, Park QH. Revealing local origin of surface-enhanced circular dichroism. In Plasmonics in Biology and Medicine XV. Vol. 10509. SPIE. 2018. 105090A https://doi.org/10.1117/12.2286900
Yoo, Seok Jae ; Lee, Seojoo ; Park, Q Han. / Revealing local origin of surface-enhanced circular dichroism. Plasmonics in Biology and Medicine XV. Vol. 10509 SPIE, 2018.
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