Optical properties of nanoporous gold foams
Source abstract
Abstract
We fabricated and experimentally studied Au nano-foams and Al2O3 scaffolds filled with Au nanoparticles (NPs). We found that while the reflectance spectra of Au nano-foams depended very little on the 8-10 nm Al2O3 ALD coating, the spectra were highly sensitive to annealing, which increased the sizes of voids and ligaments from 50-100 nm to ∼300 nm. The effective dielectric permittivities of the Au nano-foams and Al2O3 scaffolds with Au NPs were extremely high, ∼50. At the same time, Au nano-foams covered with a dielectric (MgF2) featured bright structural colors, calling for the model, which extends beyond the effective medium approximation.
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Research context
OpenAlex topics: Nanoporous metals and alloys · Nanocluster Synthesis and Applications · Anodic Oxide Films and Nanostructures
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center for Material Research, Norfolk State University 1 , Norfolk, Virginia 23504, USA
Nanoscale Synthesis and Characterization Laboratory, Lawrence Livermore National Laboratory 2 , P.O. Box 808, L-370, Livermore, California 94550, USA
MIT Lincoln Laboratory 3 , 244 Wood St., Lexington, Massachusetts 02421, USA
Funding
National Science Foundation · Office of the Secretary of Defense · Lawrence Livermore National Laboratory · Army Research Office · Air Force Office of Scientific Research
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