---
res:
  bibo_abstract:
  - <jats:p>Efficient detection of near-infrared light at telecommunication wavelengths
    remains a central challenge for GaAs-based photonic and optoelectronic devices
    due to the absence of linear absorption below the bandgap. Here, we demonstrate
    a hybrid nonlinear optoelectronic device that enhances the detection efficiency
    of a (001)-oriented GaAs PIN photodiode under telecommunication-wavelength illumination,
    where absorption is intrinsically limited to two-photon absorption (2PA). Our
    approach relies on the integration of a transferred, nanopatterned 385 nm-thick
    (111)-oriented GaAs nanofilm acting as an on-chip nonlinear frequency-conversion
    layer. Elliptical GaAs nanoresonators are employed to enhance second-harmonic
    generation (SHG) resonantly, converting incident 1550 nm radiation into above-bandgap
    photons efficiently absorbed by the underlying diode. Spatially resolved current–voltage
    measurements reveal a pronounced enhancement of the detector response in regions
    covered by the nanoantennas. The device exhibits a low dark current, while the
    metasurface-covered regions show the largest current response under 1560 nm excitation
    compared to the bare GaAs(100) diode and the unstructured GaAs(111) film. These
    results establish a direct functional link between dielectric metasurface–based
    nonlinear frequency conversion and electrical photodetection, providing a viable
    route toward integrated sub-bandgap detection schemes.</jats:p>@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Vladimir
      foaf_name: Spedt, Vladimir
      foaf_surname: Spedt
  - foaf_Person:
      foaf_givenName: Falco
      foaf_name: Meier, Falco
      foaf_surname: Meier
  - foaf_Person:
      foaf_givenName: René
      foaf_name: Geromel, René
      foaf_surname: Geromel
  - foaf_Person:
      foaf_givenName: Pascal
      foaf_name: Mahler, Pascal
      foaf_surname: Mahler
  - foaf_Person:
      foaf_givenName: Tobias
      foaf_name: Henksmeier, Tobias
      foaf_surname: Henksmeier
      foaf_workInfoHomepage: http://www.librecat.org/personId=42539
  - foaf_Person:
      foaf_givenName: Dirk
      foaf_name: Reuter, Dirk
      foaf_surname: Reuter
      foaf_workInfoHomepage: http://www.librecat.org/personId=37763
  - foaf_Person:
      foaf_givenName: Thomas
      foaf_name: Zentgraf, Thomas
      foaf_surname: Zentgraf
      foaf_workInfoHomepage: http://www.librecat.org/personId=30525
    orcid: 0000-0002-8662-1101
  - foaf_Person:
      foaf_givenName: Cedrik
      foaf_name: Meier, Cedrik
      foaf_surname: Meier
      foaf_workInfoHomepage: http://www.librecat.org/personId=20798
    orcid: https://orcid.org/0000-0002-3787-3572
  bibo_doi: 10.1364/oe.601288
  bibo_issue: '16'
  bibo_volume: 34
  dct_date: 2026^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/1094-4087
  dct_language: eng
  dct_publisher: Optica Publishing Group@
  dct_title: Hybrid GaAs (111)/GaAs (100) PIN photodiodes for metasurface-assisted
    nonlinear upconversion detection@
...