Observation of edge bound states in the continuum at truncated silicon pillar photonic crystal.

Autor: Sato R; DTU Electro, Technical University of Denmark, Ørsteds Plads, Building 343, DK-2800, Kgs. Lyngby, Denmark., Vinther Bertelsen C; DTU Bioengineering - Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads, Building 221, DK-2800, Kgs. Lyngby, Denmark., Nikitin M; DTU Electro, Technical University of Denmark, Ørsteds Plads, Building 343, DK-2800, Kgs. Lyngby, Denmark., Lopez Aymerich E; DTU Nanolab - National Centre for Nano Fabrication and Characterization, Technical University of Denmark, Ørsteds Plads, Building 347, DK-2800, Kgs. Lyngby, Denmark., Malureanu R; DTU Electro, Technical University of Denmark, Ørsteds Plads, Building 343, DK-2800, Kgs. Lyngby, Denmark., Edith Svendsen W; DTU Bioengineering - Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads, Building 221, DK-2800, Kgs. Lyngby, Denmark., Lavrinenko AV; DTU Electro, Technical University of Denmark, Ørsteds Plads, Building 343, DK-2800, Kgs. Lyngby, Denmark., Takayama O; DTU Electro, Technical University of Denmark, Ørsteds Plads, Building 343, DK-2800, Kgs. Lyngby, Denmark. otak@dtu.dk.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Dec 04; Vol. 15 (1), pp. 10544. Date of Electronic Publication: 2024 Dec 04.
DOI: 10.1038/s41467-024-54929-0
Abstrakt: Bound states in the continuum are optical modes with extremely high-quality factors and narrow resonances, which exist in the dispersion spectrum of the radiative region above the light line. A unique bound state in the continuum is supported at the edge of truncated photonic crystals, which is a type of a Fabry-Pérot type bound state in the continuum, but has never been observed in experiments. Here, we demonstrate the bound states in the continuum supported at the edge array of silicon (Si) pillars whose diameter is bigger than that of the rest of a Si-pillar two-dimensional photonic crystal. We also show the tunability of the resonance and surface sensitivity of the mode when Si pillars are conformally coated with nanometer-thick aluminium oxide films. The presence of an oxide nanofilm improves the quality factor by over 60 % and shifts the resonance wavelength. Such behavior signifies the substantial potential of the bound states in the continuum on two-dimensional photonic crystals for post-fabrication tuning of the quality factor and surface sensing applications.
Competing Interests: Competing interests: The authors declare no competing interests.
(© 2024. The Author(s).)
Databáze: MEDLINE
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