We compare the dielectric functions of silver interfaces obtained via thermal evaporation with those obtained with template stripping. Ellipsometry measurements show that the smoother template-stripped surfaces exhibit effective dielectric functions with a more negative real component and a smaller imaginary component, implying higher conductivity and less energy loss, respectively. These results agree with the relation between dielectric function and surface roughness derived from combining the effective-medium model and the Drude-Lorentz model. The improvement in the effective dielectric properties shows that metallic films prepared via template stripping can be favorable for applications in electronics, nanophotonics, and plasmonics.
Bibliographical noteFunding Information:
This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award No. DE-FG02-06ER46438 and used resources at the University of Minnesota Characterization Facility, which has received capital equipment funding from the U.S. National Science Foundation (NSF) under the MRSEC and NNIN Programs. S.-H.O. acknowledges support from the NSF CAREER Award and the Office of Naval Research Young Investigator Award (N00014-11-1-0645).