Enhancement of Circular Dichroism of a Chiral Material by Dielectric Nanospheres

Daniel Vestler; Assaf Ben-Moshe; Gil Markovich

doi:10.1021/acs.jpcc.8b10975

Enhancement of Circular Dichroism of a Chiral Material by Dielectric Nanospheres

Daniel Vestler, Assaf Ben-Moshe, Gil Markovich

Tel Aviv University

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

Circular dichroism (CD) spectroscopy is very useful for studies of biomolecular conformation but suffers from very weak signals. Several theoretical and experimental papers reported schemes for CD enhancement using enhanced local fields produced by plasmonic nanostructures. Here we report enhancement of visible wavelength CD of chiral mercury sulfide (HgS) nanocrystals by Mie resonances of amorphous selenium nanospheres. The spatially averaged CD enhancement factor was estimated to be 4.7 ± 1.5 fold, while the peak enhancement at particular locations on the nanospheres is probably >10. This type of enhancement may be useful for increasing the sensitivity of CD measurements and in particular toward achievement of single chiral nanostructure CD measurements.

Original language	English
Pages (from-to)	5017-5022
Number of pages	6
Journal	Journal of Physical Chemistry C
Volume	123
Issue number	8
DOIs	https://doi.org/10.1021/acs.jpcc.8b10975
State	Published - 28 Feb 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.

Funding

This work was supported by Israel Science Foundation grant no. 507/14.

Funders	Funder number
Israel Science Foundation	507/14

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10.1021/acs.jpcc.8b10975

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AB - Circular dichroism (CD) spectroscopy is very useful for studies of biomolecular conformation but suffers from very weak signals. Several theoretical and experimental papers reported schemes for CD enhancement using enhanced local fields produced by plasmonic nanostructures. Here we report enhancement of visible wavelength CD of chiral mercury sulfide (HgS) nanocrystals by Mie resonances of amorphous selenium nanospheres. The spatially averaged CD enhancement factor was estimated to be 4.7 ± 1.5 fold, while the peak enhancement at particular locations on the nanospheres is probably >10. This type of enhancement may be useful for increasing the sensitivity of CD measurements and in particular toward achievement of single chiral nanostructure CD measurements.

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Enhancement of Circular Dichroism of a Chiral Material by Dielectric Nanospheres

Abstract

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