Observation of enhanced epsilon-near-zero effects in resonant stratified media

Roman Calpe, Petri Karvinen, Pertti Pääkkönen, Marco Ornigotti, Humeyra Caglayan, Jari Turunen, Tommi K. Hakala, Matias Koivurova

Tutkimustuotos: ArtikkeliScientificvertaisarvioitu

2 Lataukset (Pure)

Abstrakti

Epsilon-near-zero (ENZ) materials have gained recent interest due to their exotic optical properties, but their potential is limited by intrinsic material losses. Enhanced epsilon-near-zero (eENZ) materials are periodically stratified media consisting of alternating ENZ and dielectric layers. In this study, we demonstrate the fabrication and optical characterization of 15-layer ENZ-dielectric thin film stack, wherein indium tin oxide functions as the ENZ material and titanium dioxide as the dielectric. We experimentally show the enhanced optical transmission of the structure over a bare ENZ film with similar thickness. Further, we display the giant polarization dependent optical response of the material, which is characterized by the narrowing from 56° to 14° in half-width at half-maximum of the transmission cone. These properties are physically attributed to guided-waves, Fabry-Pérot resonances, and Ferrell-Berreman plasmons within the film stack. The experimental realization of our material paves the way for devices utilizing eENZ-materials, such as coherence switchable lasers and light sources with directional emission.

AlkuperäiskieliEnglanti
Artikkeli091701
JulkaisuApplied Physics Letters
Vuosikerta124
Numero9
DOI - pysyväislinkit
TilaJulkaistu - 26 helmik. 2024
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Julkaisufoorumi-taso

  • Jufo-taso 3

!!ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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