Resonant Absorption in GaAs-Based Nanowires by Means of Photo-Acoustic Spectroscopy

E. Petronijevic, G. Leahu, A. Belardini, M. Centini, R. Li Voti, T. Hakkarainen, E. Koivusalo, M. Guina, C. Sibilia

    Tutkimustuotos: ArtikkeliTieteellinenvertaisarvioitu

    23 Sitaatiot (Scopus)
    11 Lataukset (Pure)

    Abstrakti

    Semiconductor nanowires made of high refractive index materials can couple the incoming light to specific waveguide modes that offer resonant absorption enhancement under the bandgap wavelength, essential for light harvesting, lasing and detection applications. Moreover, the non-trivial ellipticity of such modes can offer near field interactions with chiral molecules, governed by near chiral field. These modes are therefore very important to detect. Here, we present the photo-acoustic spectroscopy as a low-cost, reliable, sensitive and scattering-free tool to measure the spectral position and absorption efficiency of these modes. The investigated samples are hexagonal nanowires with GaAs core; the fabrication by means of lithography-free molecular beam epitaxy provides controllable and uniform dimensions that allow for the excitation of the fundamental resonant mode around 800 nm. We show that the modulation frequency increase leads to the discrimination of the resonant mode absorption from the overall absorption of the substrate. As the experimental data are in great agreement with numerical simulations, the design can be optimized and followed by photo-acoustic characterization for a specific application.

    AlkuperäiskieliEnglanti
    Artikkeli45
    JulkaisuInternational Journal of Thermophysics
    Vuosikerta39
    Numero3
    DOI - pysyväislinkit
    TilaJulkaistu - 1 maalisk. 2018
    OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

    Julkaisufoorumi-taso

    • Jufo-taso 1

    !!ASJC Scopus subject areas

    • Condensed Matter Physics

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