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Tunable, Low Optical Loss Strontium Molybdate Thin Films for Plasmonic Applications

Wells, MP and Zou, B and Doiron, BG and Kilmurray, R and Mihai, AP and Oulton, RFM and Gubeljak, P and Ormandy, KL and Mallia, G and Harrison, NM and Cohen, LF and Maier, SA and Alford, NMN and Petrov, PK (2017) Tunable, Low Optical Loss Strontium Molybdate Thin Films for Plasmonic Applications. Advanced Optical Materials, 5.

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Strontium molybdate (SrMoO ) thin films are grown epitaxially on strontium titanate (SrTiO ), magnesium oxide (MgO), and lanthanum aluminate (LaAlO ) substrates by pulsed laser deposition and possess electrical resistivity as low as 100 µΩ cm at room temperature. SrMoO is shown to have optical losses, characterized by the product of the Drude broadening, Γ , and the square of the plasma frequency, ω , significantly lower than TiN, though generally higher than Au. Also, it is demonstrated that there is a zero-crossover wavelength of the real part of the dielectric permittivity, which is between 600 and 950 nm (2.05 and 1.31 eV), as measured by spectroscopic ellipsometry. Moreover, the epsilon near zero (ENZ) wavelength can be controlled by engineering the residual strain in the films, which arises from a strain dependence of the charge carrier concentration, as confirmed by density of states calculations. The relatively broad tunability of ENZ behavior observed in SrMoO demonstrates its potential suitability for transformation optics along with plasmonic applications in the visible to near infrared spectral range. 3 3 3 3 D pu 3 2

Item Type: Article
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 15 Jan 2021 22:21
Last Modified: 15 Apr 2021 06:58
DOI: 10.1002/adom.201700622