A method for geometrically modifying plasmonic structures on a support structure, said method comprising: a. Providing the support structure, said support structure being a solid polymer, b. Providing a first plurality of plasmonic structures, said plasmonic structures being supported by the support structure, c. Changing a geometry specifically of plasmonic structures within a second plurality of plasmonic structures to form geometrically modified plasmonic structures for use in a color printing process or a data storage process, wherein the second plurality of plasmonic structures is a sub-set of the first plurality of plasmonic structures, wherein said changing the geometry is carried out by photothermally melting at least a portion of each of the plasmonic structures within the second plurality of plasmonic structures by irradiating the second plurality of plasmonic structures with incident electromagnetic radiation having an incident intensity in a plane of the second plurality of plasmonic structures, and thereby exciting localized surface plasmon resonances associated with each of the plasmonic structures within the second plurality of plasmonic structures, wherein said incident intensity is less than an incident intensity required to melt a film of a same material and a same thickness as the plasmonic structures within the second plurality of plasmonic structures, wherein said support structure comprises a first plurality of topographical features, wherein the first plurality topographical features comprises protrusions or indentations formed relative to a surface of the support structure, and wherein a color printing or data recording resolution of the geometrically modified plasmonic structures on the support structure is at least 10 kDPI. a. Providing the support structure, said support structure being a solid polymer, b. Providing a first plurality of plasmonic structures, said plasmonic structures being supported by the support structure, c. Changing a geometry specifically of plasmonic structures within a second plurality of plasmonic structures to form geometrically modified plasmonic structures for use in a color printing process or a data storage process, wherein the second plurality of plasmonic structures is a sub-set of the first plurality of plasmonic structures, wherein said changing the geometry is carried out by photothermally melting at least a portion of each of the plasmonic structures within the second plurality of plasmonic structures by irradiating the second plurality of plasmonic structures with incident electromagnetic radiation having an incident intensity in a plane of the second plurality of plasmonic structures, and thereby exciting localized surface plasmon resonances associated with each of the plasmonic structures within the second plurality of plasmonic structures, wherein said incident intensity is less than an incident intensity required to melt a film of a same material and a same thickness as the plasmonic structures within the second plurality of plasmonic structures, wherein said support structure comprises a first plurality of topographical features, wherein the first plurality topographical features comprises protrusions or indentations formed relative to a surface of the support structure, and wherein a color printing or data recording resolution of the geometrically modified plasmonic structures on the support structure is at least 10 kDPI. <EOS>