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Metallic nanocrystals (NCs) are useful instruments for light manipulationaround the visible spectrum. As their plasmonic resonances depend heavily onthe NC geometry, modern fabrication techniques afford a great degree of controlover their optical responses. We take advantage of this fact to create opticalfilters in the visible-near IR. Our systems show an extinction spectrum thatcovers a wide range of wavelengths (UV to mid-IR), while featuring a narrowtransparency band around a wavelength of choice. We achieve this by carefullyselecting the geometries of a collection of NCs with narrow resonances thatcover densely the spectrum from UV to mid-IR except for the frequenciestargeted for transmission. This fundamental design can be executed in differentkinds of systems, including a solution of colloidal metal NCs (metafluids), astructured 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 extentit hinders the intended objective by shifting and modifying the profile of theplanned resonances through the hybridization of their plasmonic modes. We havefound that the Beer-Lambert law is very robust overall and is violated onlyupon aggregation or in configurations with nearly-touching NCs. This strikingproperty favors the creation of metafluids with a narrow transparency window,which are investigated here.

journal of physical chemistry. c./journal of physical chemistry. c

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