Optical Plasmon Excitation in Transparent Conducting SrNbO3 and SrVO3 Thin Films
| Autor: | Lambert Alff, Tommi K. Hakala, Mikko Kataja, Gervasi Herranz, Josep Fontcuberta, Philipp Komissinskiy, Mathieu Mirjolet |
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| Přispěvatelé: | Ministerio de Ciencia, Innovación y Universidades (España), Generalitat de Catalunya, European Cooperation in Science and Technology, German Research Foundation, Academy of Finland |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
SrNbO3 media_common.quotation_subject Plasmon excitation SrVO3 Library science Physics::Optics Plasma frequency 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Excellence 0103 physical sciences Epitaxial films Christian ministry Transparent conducting oxides Plasmon resonance 010306 general physics 0210 nano-technology media_common |
| Zdroj: | Digital.CSIC: Repositorio Institucional del CSIC Consejo Superior de Investigaciones Científicas (CSIC) Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Transparent and metallic oxides based on 3d and 4d metals are promising materials for plasmonics. Here, the growth window to obtain epitaxial SrNbO3 (4d1) thin films is determined and the role of substrates to achieve optimal electrical conductivity and the largest residual resistivity ratio is disclosed. Optical measurements on optimized films indicate a large transparency at the visible with a sharp edge at about 1.9 eV, which coincides with the zero-crossing of the permittivity, allowing to identify the plasma frequency ωp. Similar features are observed in SrVO3 (3d1) films. Optical losses display well pronounced maxima at the corresponding ωp. Polarization-dependent optical transmittance measurements and ellipsometric data show a dip at ωp, occurring for p- but not s-polarized light, which is a fingerprint of optical bulk plasmon excitation. Remarkably, plasmon resonance is achieved here by using oblique incidence of light rather than phase-matching arrangements, and by exploiting charge density gradients at the film surface. This observation points to new opportunities for engineering plasmons in heterostructures. Financial support from the Spanish Ministry of Science, Innovation and Universities, through the “Severo Ochoa” Programme for Centres of Excellence in R&D (FUNFUTURE, CEX2019-000917-S) and the MAT2017-85232-R (AEI/FEDER, EU) projects, from Generalitat de Catalunya (2017 SGR 1377), and from the COST Association (Action MP1308), is acknowledged. This work was also funded by the Deutsche Forschungsgemeinschaft (DFG) under Project No. KO 4093/1-4. T.K.H. acknowledges the Academy of Finland Flagship Programme, Photonics Research and Innovation PREIN 320166 and Academy of Finland project number 322002. The work of M.M. has been done as a part of the Ph.D. program in Physics at Universitat Autònoma de Barcelona, and was financially supported by the Spanish Ministry of Science, Innovation and Universities (BES-2015-075223). The authors are extremely thankful to Raul Solanas for his skillful operation of one PLD system used in this project (at ICMAB). |
| Databáze: | OpenAIRE |
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