Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/143913
Title: Simple and complex metafluids and metastructures with sharp spectral features in a broad extinction spectrum : particle-particle interactions and testing the limits of the Beer-Lambert law
Authors: Besteiro, Lucas V.
Gungor, Kivanc
Demir, Hilmi Volkan
Govorov, Alexander O.
Keywords: Science::Physics
Issue Date: 2017
Source: Besteiro, L. V., Gungor, K., Demir, H. V., & Govorov, A. O. (2017). Simple and complex metafluids and metastructures with sharp spectral features in a broad extinction spectrum : particle-particle interactions and testing the limits of the Beer-Lambert law. The Journal of Physical Chemistry C, 121(5), 2987-2997. doi:10.1021/acs.jpcc.6b11550
Journal: The Journal of Physical Chemistry C
Abstract: Metallic nanocrystals (NCs) are useful instruments for light manipulation around the visible spectrum. As their plasmonic resonances depend heavily on the NC geometry, modern fabrication techniques afford a great degree of control over their optical responses. We take advantage of this fact to create optical filters in the visible-near IR. Our systems show an extinction spectrum that covers a wide range of wavelengths (UV to mid-IR), while featuring a narrow transparency band around a wavelength of choice. We achieve this by carefully selecting the geometries of a collection of NCs with narrow resonances that cover densely the spectrum from UV to mid-IR except for the frequencies targeted for transmission. This fundamental design can be executed in different kinds of systems, including a solution of colloidal metal NCs (metafluids), a structured planar metasurface or a combination of both. Along with the theory, we report experimental results, showing metasurface realizations of the system, and we discuss the strengths and weaknesses of these different approaches, paying particular attention to particle-particle interaction and to what extent it hinders the intended objective by shifting and modifying the profile of the planned resonances through the hybridization of their plasmonic modes. We have found that the Beer-Lambert law is very robust overall and is violated only upon aggregation or in configurations with nearly-touching NCs. This striking property favors the creation of metafluids with a narrow transparency window, which are investigated here.
URI: https://hdl.handle.net/10356/143913
ISSN: 1932-7447
DOI: 10.1021/acs.jpcc.6b11550
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.6b11550
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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