Jayanti, Sriharsha V. Park, Jong Hyuk Dejneka, Alexandr Chvostova, Dagmar McPeak, Kevin M. Chen, Xiaoshu Oh, Sang-Hyun Norris, David J. 2024-01-20T07:03:13Z 2024-01-20T07:03:13Z 2021-09-04 2015-05-01 2159-3930 https://pubs.kist.re.kr/handle/201004/125464 While plasmonic metals can manipulate optical energy at the nanoscale, they suffer from significant losses at visible wavelengths. We investigate the potential of low temperature to decrease such losses in optically thick Ag films. We extract the complex dielectric function (or relative permittivity) from spectroscopic ellipsometry measurements for smooth single-crystalline, smooth polycrystalline, and rough polycrystalline films down to liquid-helium temperatures and fit these data to a temperature-dependent Drude model. Smooth single-crystalline films exhibited the largest improvements relative to room temperature. Below 50 K, the surface plasmon polariton propagation lengths increased by similar to 50% at 650 nm. In rough polycrystalline films, improvements of 10% are expected. (C) 2015 Optical Society of America English OPTICAL SOC AMER ELECTRON-ELECTRON SCATTERING INTRABAND OPTICAL CONDUCTIVITY NOBLE-METALS INFRARED ABSORPTIVITY AU AG CU NANOSTRUCTURES METAMATERIALS RESISTIVITY Low-temperature enhancement of plasmonic performance in silver films Article 10.1364/OME.5.001147 1 OPTICAL MATERIALS EXPRESS, v.5, no.5, pp.1147 - 1155 OPTICAL MATERIALS EXPRESS 5 5 1147 1155 scie scopus 000353922700023 2-s2.0-84929379295 Materials Science, Multidisciplinary Optics Materials Science Optics Article ELECTRON-ELECTRON SCATTERING INTRABAND OPTICAL CONDUCTIVITY NOBLE-METALS INFRARED ABSORPTIVITY AU AG CU NANOSTRUCTURES METAMATERIALS RESISTIVITY Surface plasmons Ellipsometry and polarimetry Materials and process characterization Metals