Low-temperature enhancement of plasmonic performance in silver films

0448747 - FZÚ 2016 RIV US eng J - Journal Article
Jayanti, S.V. - Park, J.H. - Dejneka, Alexandr - Chvostová, Dagmar - McPeak, K.M. - Chen, X. - Oh, S.H. - Norris, D.J.
Low-temperature enhancement of plasmonic performance in silver films.
Optical Materials Express. Roč. 5, č. 5 (2015), 1147-1155. ISSN 2159-3930
R&D Projects: GA ČR(CZ) GA15-13853S
Institutional support: RVO:68378271
Keywords : plasmonic performance * silver films * low temperature * spectroscopic ellipsometry
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 2.657, year: 2015

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 ~50% at 650 nm. In rough polycrystalline films, improvements of 10% are expected.
Permanent Link: http://hdl.handle.net/11104/0250381