---
res:
  bibo_abstract:
  - Thin-film lithium niobate (TFLN) in the form of x- or z-cut lithium-niobate-on-insulator
    has attracted considerable interest as a very promising and novel platform for
    developing integrated optoelectronic (nano)devices and exploring fundamental research.
    Here, we investigate the coherent interaction length lc of optical second-harmonic
    generation (SHG) microscopy in such samples, that are purposely prepared into
    a wedge shape, in order to elegantly tune the geometrical confinement from bulk
    thicknesses down to approximately 50 nm. SHG microscopy is a very powerful and
    non-invasive tool for the investigation of structural properties in the biological
    and solid-state sciences, especially for visualizing and analyzing ferroelectric
    domains and domain walls. However, unlike in bulk lithium niobate (LN), SHG microscopy
    in TFLN is impacted by interfacial reflections and resonant enhancement, both
    of which rely on film thickness and substrate material. In this paper, we show
    that the dominant SHG contribution measured on TFLN in backreflection is the co-propagating
    phase-matched SHG signal and not the counter-propagating SHG portion as is the
    case for bulk LN samples. Moreover, lc depends on the incident pump laser wavelength
    (sample dispersion) but also on the numerical aperture of the focussing objective
    in use. These experimental findings on x- and z-cut TFLN are excellently backed
    up by our advanced numerical simulations.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Zeeshan H.
      foaf_name: Amber, Zeeshan H.
      foaf_surname: Amber
  - foaf_Person:
      foaf_givenName: Benjamin
      foaf_name: Kirbus, Benjamin
      foaf_surname: Kirbus
  - foaf_Person:
      foaf_givenName: Lukas M.
      foaf_name: Eng, Lukas M.
      foaf_surname: Eng
  - foaf_Person:
      foaf_givenName: Michael
      foaf_name: Rüsing, Michael
      foaf_surname: Rüsing
      foaf_workInfoHomepage: http://www.librecat.org/personId=22501
    orcid: 0000-0003-4682-4577
  bibo_doi: 10.1063/5.0058996
  bibo_issue: '13'
  bibo_volume: 130
  dct_date: 2021^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/0021-8979
  - http://id.crossref.org/issn/1089-7550
  dct_language: eng
  dct_publisher: AIP Publishing@
  dct_subject:
  - General Physics and Astronomy
  dct_title: Quantifying the coherent interaction length of second-harmonic microscopy
    in lithium niobate confined nanostructures@
...