---
_id: '9038'
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. '
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)."
article_number: '120'
article_processing_charge: No
article_type: original
author:
- first_name: Patricia
  full_name: Aguilar-Merino, Patricia
  last_name: Aguilar-Merino
- first_name: Gonzalo
  full_name: Álvarez-Pérez, Gonzalo
  last_name: Álvarez-Pérez
- first_name: Javier
  full_name: Taboada-Gutiérrez, Javier
  last_name: Taboada-Gutiérrez
- first_name: Jiahua
  full_name: Duan, Jiahua
  last_name: Duan
- first_name: Ivan
  full_name: Prieto Gonzalez, Ivan
  id: 2A307FE2-F248-11E8-B48F-1D18A9856A87
  last_name: Prieto Gonzalez
  orcid: 0000-0002-7370-5357
- first_name: Luis Manuel
  full_name: Álvarez-Prado, Luis Manuel
  last_name: Álvarez-Prado
- first_name: Alexey Y.
  full_name: Nikitin, Alexey Y.
  last_name: Nikitin
- first_name: Javier
  full_name: Martín-Sánchez, Javier
  last_name: Martín-Sánchez
- first_name: Pablo
  full_name: Alonso-González, Pablo
  last_name: Alonso-González
citation:
  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>
  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>
  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>.
  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.
  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.
  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).
date_created: 2021-01-24T23:01:09Z
date_published: 2021-01-07T00:00:00Z
date_updated: 2026-04-02T13:57:24Z
day: '07'
ddc:
- '620'
department:
- _id: NanoFab
doi: 10.3390/nano11010120
external_id:
  isi:
  - '000610636600001'
  pmid:
  - '33430225'
file:
- access_level: open_access
  checksum: 1edc13eeda83df5cd9fff9504727b1f5
  content_type: application/pdf
  creator: dernst
  date_created: 2021-01-25T08:02:32Z
  date_updated: 2021-01-25T08:02:32Z
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  file_size: 2730267
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file_date_updated: 2021-01-25T08:02:32Z
has_accepted_license: '1'
intvolume: '        11'
isi: 1
issue: '1'
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
pmid: 1
publication: Nanomaterials
publication_identifier:
  eissn:
  - 2079-4991
publication_status: published
publisher: MDPI
quality_controlled: '1'
scopus_import: '1'
status: public
title: Extracting the infrared permittivity of SiO2 substrates locally by near-field
  imaging of phonon polaritons in a van der Waals crystal
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: ba8df636-2132-11f1-aed0-ed93e2281fdd
volume: 11
year: '2021'
...