{"date_published":"2021-01-07T00:00:00Z","tmp":{"short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png"},"pmid":1,"acknowledgement":"P.A.-M. acknowledges financial support through JAE Intro program from the Superior\r\nCouncil of Scientific Investigations and the Spanish Ministry of Science and Innovation (grant number JAEINT_20_00589). G.Á.-P. and J.T.-G. acknowledge financial support through the Severo Ochoa Program from the Government of the Principality of Asturias (grant numbers PA-20-PF-BP19-053 and PA-18-PF-BP17-126, respectively). J.M.-S. acknowledges financial support from the Ramón y Cajal Program of the Government of Spain (RYC2018-026196-I) and the Spanish Ministry of Science and Innovation (State Plan for Scientific and Technical Research and Innovation grant number PID2019-110308GA-I00). P.A.-G. acknowledges support from the European Research Council under starting grant no. 715496, 2DNANOPTICA and the Spanish Ministry of Science and Innovation (State Plan for Scientific and Technical Research and Innovation grant number PID2019-111156GB-I00).","quality_controlled":"1","type":"journal_article","oa":1,"issue":"1","author":[{"last_name":"Aguilar-Merino","full_name":"Aguilar-Merino, Patricia","first_name":"Patricia"},{"last_name":"Álvarez-Pérez","first_name":"Gonzalo","full_name":"Álvarez-Pérez, Gonzalo"},{"last_name":"Taboada-Gutiérrez","first_name":"Javier","full_name":"Taboada-Gutiérrez, Javier"},{"full_name":"Duan, Jiahua","first_name":"Jiahua","last_name":"Duan"},{"last_name":"Prieto Gonzalez","id":"2A307FE2-F248-11E8-B48F-1D18A9856A87","first_name":"Ivan","full_name":"Prieto Gonzalez, Ivan","orcid":"0000-0002-7370-5357"},{"first_name":"Luis Manuel","full_name":"Álvarez-Prado, Luis Manuel","last_name":"Álvarez-Prado"},{"last_name":"Nikitin","first_name":"Alexey Y.","full_name":"Nikitin, Alexey Y."},{"first_name":"Javier","full_name":"Martín-Sánchez, Javier","last_name":"Martín-Sánchez"},{"last_name":"Alonso-González","full_name":"Alonso-González, Pablo","first_name":"Pablo"}],"date_created":"2021-01-24T23:01:09Z","date_updated":"2023-08-07T13:35:50Z","publication_identifier":{"eissn":["20794991"]},"day":"07","scopus_import":"1","intvolume":"        11","has_accepted_license":"1","article_processing_charge":"No","external_id":{"pmid":["33430225"],"isi":["000610636600001"]},"isi":1,"month":"01","article_type":"original","_id":"9038","title":"Extracting the infrared permittivity of SiO2 substrates locally by near-field imaging of phonon polaritons in a van der Waals crystal","abstract":[{"lang":"eng","text":"Layered materials in which individual atomic layers are bonded by weak van der Waals forces (vdW materials) constitute one of the most prominent platforms for materials research. Particularly, polar vdW crystals, such as hexagonal boron nitride (h-BN), alpha-molybdenum trioxide (α-MoO3) or alpha-vanadium pentoxide (α-V2O5), have received significant attention in nano-optics, since they support phonon polaritons (PhPs)―light coupled to lattice vibrations― with strong electromagnetic confinement and low optical losses. Recently, correlative far- and near-field studies of α-MoO3 have been demonstrated as an effective strategy to accurately extract the permittivity of this material. Here, we use this accurately characterized and low-loss polaritonic material to sense its local dielectric environment, namely silica (SiO2), one of the most widespread substrates in nanotechnology. By studying the propagation of PhPs on α-MoO3 flakes with different thicknesses laying on SiO2 substrates via near-field microscopy (s-SNOM), we extract locally the infrared permittivity of SiO2. Our work reveals PhPs nanoimaging as a versatile method for the quantitative characterization of the local optical properties of dielectric substrates, crucial for understanding and predicting the response of nanomaterials and for the future scalability of integrated nanophotonic devices. "}],"year":"2021","publication":"Nanomaterials","department":[{"_id":"NanoFab"}],"status":"public","doi":"10.3390/nano11010120","oa_version":"Published Version","language":[{"iso":"eng"}],"publication_status":"published","citation":{"chicago":"Aguilar-Merino, Patricia, Gonzalo Álvarez-Pérez, Javier Taboada-Gutiérrez, Jiahua Duan, Ivan Prieto Gonzalez, Luis Manuel Álvarez-Prado, Alexey Y. Nikitin, Javier Martín-Sánchez, and Pablo Alonso-González. “Extracting the Infrared Permittivity of SiO2 Substrates Locally by Near-Field Imaging of Phonon Polaritons in a van Der Waals Crystal.” <i>Nanomaterials</i>. MDPI, 2021. <a href=\"https://doi.org/10.3390/nano11010120\">https://doi.org/10.3390/nano11010120</a>.","mla":"Aguilar-Merino, Patricia, et al. “Extracting the Infrared Permittivity of SiO2 Substrates Locally by Near-Field Imaging of Phonon Polaritons in a van Der Waals Crystal.” <i>Nanomaterials</i>, vol. 11, no. 1, 120, MDPI, 2021, doi:<a href=\"https://doi.org/10.3390/nano11010120\">10.3390/nano11010120</a>.","short":"P. Aguilar-Merino, G. Álvarez-Pérez, J. Taboada-Gutiérrez, J. Duan, I. Prieto Gonzalez, L.M. Álvarez-Prado, A.Y. Nikitin, J. Martín-Sánchez, P. Alonso-González, Nanomaterials 11 (2021).","apa":"Aguilar-Merino, P., Álvarez-Pérez, G., Taboada-Gutiérrez, J., Duan, J., Prieto Gonzalez, I., Álvarez-Prado, L. M., … Alonso-González, P. (2021). Extracting the infrared permittivity of SiO2 substrates locally by near-field imaging of phonon polaritons in a van der Waals crystal. <i>Nanomaterials</i>. MDPI. <a href=\"https://doi.org/10.3390/nano11010120\">https://doi.org/10.3390/nano11010120</a>","ista":"Aguilar-Merino P, Álvarez-Pérez G, Taboada-Gutiérrez J, Duan J, Prieto Gonzalez I, Álvarez-Prado LM, Nikitin AY, Martín-Sánchez J, Alonso-González P. 2021. Extracting the infrared permittivity of SiO2 substrates locally by near-field imaging of phonon polaritons in a van der Waals crystal. Nanomaterials. 11(1), 120.","ieee":"P. Aguilar-Merino <i>et al.</i>, “Extracting the infrared permittivity of SiO2 substrates locally by near-field imaging of phonon polaritons in a van der Waals crystal,” <i>Nanomaterials</i>, vol. 11, no. 1. MDPI, 2021.","ama":"Aguilar-Merino P, Álvarez-Pérez G, Taboada-Gutiérrez J, et al. Extracting the infrared permittivity of SiO2 substrates locally by near-field imaging of phonon polaritons in a van der Waals crystal. <i>Nanomaterials</i>. 2021;11(1). doi:<a href=\"https://doi.org/10.3390/nano11010120\">10.3390/nano11010120</a>"},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","publisher":"MDPI","file_date_updated":"2021-01-25T08:02:32Z","ddc":["620"],"article_number":"120","file":[{"access_level":"open_access","checksum":"1edc13eeda83df5cd9fff9504727b1f5","content_type":"application/pdf","file_name":"2020_Nanomaterials_Aguilar_Merino.pdf","relation":"main_file","file_size":2730267,"success":1,"date_created":"2021-01-25T08:02:32Z","date_updated":"2021-01-25T08:02:32Z","creator":"dernst","file_id":"9042"}],"volume":11}