Chiro-optical response of a wafer scale metamaterial with ellipsoidal metal nanoparticles

Ninawe, A and Suri, P and Xie, Z and Xu, X and Ghosh, A (2021) Chiro-optical response of a wafer scale metamaterial with ellipsoidal metal nanoparticles. In: Nanotechnology, 32 (31).

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Abstract

We report a large chiro-optical response from a nanostructured film of aperiodic dielectric helices decorated with ellipsoidal metal nanoparticles. The influence of the inherent fabrication variation on the chiro-optical response of the wafer-scalable nanostructured film is investigated using a computational model which closely mimics the material system. From the computational approach, we found that the chiro-optical signal is strongly dependent on the ellipticities of the metal nanoparticles and the developed computational model can account for all the variations caused by the fabrication process. We report the experimentally realized dissymmetry factor �1.6, which is the largest reported for wafer scalable chiro-plasmonic samples till now. The calculations incorporate strong multipolar contributions of the plasmonic interactions to the chiro-optical response from the tightly confined ellipsoidal nanoparticles, improving upon the previous studies carried in the coupled dipole approximation regime. Our analyzes confirm the large chiro-optical response in these films developed by a scalable and simple fabrication technique, indicating their applicability pertaining to manipulation of optical polarization, enantiomer selective identification and enhanced sensing and detection of chiral molecules. © 2021 IOP Publishing Ltd.

Item Type:	Journal Article
Publication:	Nanotechnology
Publisher:	IOP Publishing Ltd
Additional Information:	The copyright for this article belongs to IOP Publishing Ltd
Keywords:	Computation theory; Computational methods; Metal nanoparticles; Nanostructured materials; Plasmonic nanoparticles; Plasmonics; Stereochemistry, Computational approach; Computational model; Coupled dipole approximations; Ellipsoidal nanoparticles; Fabrication process; Fabrication technique; Nanostructured Films; Plasmonic interactions, Optical films
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 Aug 2021 06:17
Last Modified:	17 Aug 2021 06:17
URI:	http://eprints.iisc.ac.in/id/eprint/69165

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