Journal
ACS PHOTONICS
Volume 1, Issue 10, Pages 1074-1081Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ph500293u
Keywords
plasmonics; optical chirality; circular dichroism; hole-mask colloidal lithography; oligomers; numerical simulation
Categories
Funding
- Knut and Alice Wallenberg Foundation
- Swedish Foundation for Strategic Research (SSF)
- Chalmers Nanoscience and Nanotechnology Area of Advance
Ask authors/readers for more resources
Optical near-field coupling between closely spaced plasmonic metal nanoparticles is important to a range of nanophotonic applications of high contemporary interest, including surface-enhanced molecular spectroscopy, nanooptical sensing, and various novel light-harvesting concepts. Here we report on monolayers of chiral heterotrimers and heterotetramers composed of closely spaced silver and/or gold nanodisks of different heights fabricated through facile hole-mask colloidal lithography. These quasi-three-dimensional oligomers are interesting for applications because they exhibit hot gaps and crevices of nanometric dimensions, a pronounced circular dichroism, and optical chirality in the visible to near-infrared wavelength range, and they can be produced in large ensembles (>109) of identical orientation. We analyze the optical properties of the samples based on simulation results and find that the circular dichroism is due to strong near-field coupling and intricate phase retardation effects originating in the three-dimensional character of the individual oligomers.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available