Replication of patterned thin-film structures for use in plasmonics and metamaterials
The present invention provides templating methods for replicating patterned metal films from a template substrate such as for use in plasmonic devices and metamaterials. Advantageously, the template substrate is reusable and can provide plural copies of the structure of the template substrate. Because high-quality substrates that are inherently smooth and flat are available, patterned metal films in accordance with the present invention can advantageously provide surfaces that replicate the surface characteristics of the template substrate both in the patterned regions and in the unpatterned regions.
1. A method of creating an optical beam, the method comprising: providing a metal film comprising one or more periodically distributed surface feature; heating the metal film; creating surface plasmons at the surface of the metal film; and generating an optical signal.
2. The method of claim 1 , wherein at least a portion of the one or more periodically distributed surface feature comprises at least one of one or more arcuate channel, one or more linear channel, and one or more angular channel.
3. The method of claim 1 , comprising generating an optical signal comprising a beam having a spectral linewidth (full width at half maximum) from about 0.1 nm to about 50 nm and an angular linewidth (full width at half maximum) from about 0.01 degrees to about 0.1 degrees.
4. The method of claim 1 , comprising generating an optical signal comprising a beam having a wavelength of about 0.5 microns to 3.5 microns.
5. The method of claim 1 , comprising mounting the film on a heating device that comprises a resistive heater that is heated by electrical current.
6. The method of claim 1 , comprising resistively heating the metal film by running electrical current through the metal film.
7. A patterned device comprising: a metal film comprising one or more periodically distributed surface feature configured to create surface plasmons and emit an optical signal when heated; and a heating device configured to heat the metal film.
8. The patterned device of claim 7 , wherein at least a portion of the one or more periodically distributed surface feature comprises a plurality of arcuate channels.
9. The patterned device of claim 7 , wherein the metal film comprises continuous non-perforated layer.