Enhancement of Chiroptical Signals by Circular Differential Mie Scattering of Nanoparticles

Seokjae Yoo, Q Han Park

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We enhance the weak optical signals of small chiral molecules via circular differential Mie scattering (CDMS) of nanoparticles immersed in them. CDMS is the preferential Mie scattering of left-and right-handed circularly polarized light by nanoparticles whose sizes are about the same as the wavelength of light. Solving the Mie scattering theory for chiral media, we find that the CDMS signal of the particle is linearly proportional to the chirality parameter ΰ of the molecules. This linear amplitude enhancement by CDMS of the particle holds, even for large particles, which have a retardation effect. We also demonstrate that the CDMS of a nanoparticle is sensitive to changes of molecular concentration, and that the nanoparticle can be utilized as a chiroptical biosensor detecting the concentration of analyte. We expect that the enhancement of molecular chiroptical signals by CDMS will pave the way for novel chiroptical spectroscopy using nanostructures.

Original languageEnglish
Article number14463
JournalScientific Reports
Volume5
DOIs
Publication statusPublished - 2015 Sep 25

ASJC Scopus subject areas

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