Photothermal modification of plasmonic structures

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. Spatially selecting plasmonic structures to be geometrically modified, and
• d. Changing an initial geometry specifically of plasmonic structures within a second plurality of the selected plasmonic structures to form geometrically modified plasmonic structures having a resultant geometry for use in a color printing process or 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 initial geometry is carried out by photothermally melting each of the plasmonic structures of at least a portion of 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 the each of the plasmonic structures of the at least a portion of 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 of topographical features comprises topographical pillars formed on a surface of the support structure or topographical holes formed on the surface of the support structure, and wherein providing the first plurality of plasmonic structures comprises applying a metallic film to the support structure to form:
• a plurality of metallic structures on said first plurality of topographical pillars or a plurality of metallic structures in said first plurality of topographical holes, and
• a plurality of holes in the metallic film around said first plurality of topographical pillars or holes,
• wherein the resultant geometry of the geometrically modified plasmonic structures is configured to produce a color printing resolution or a data recording resolution of at least 10 kDPI on the support structure or in the color printing process or the data storage process, wherein the color printing resolution or data recording resolution is obtained by the resolution of the geometrically modified plasmonic structures.