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

Rodrigo Sato, Christian Vinther Bertelsen, Maxim Nikitin, Elena Lopez Aymerich, Radu Malureanu, Winnie Edith Svendsen, Andrei V. Lavrinenko and Osamu Takayama ()
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Rodrigo Sato: Technical University of Denmark
Christian Vinther Bertelsen: Technical University of Denmark
Maxim Nikitin: Technical University of Denmark
Elena Lopez Aymerich: Technical University of Denmark
Radu Malureanu: Technical University of Denmark
Winnie Edith Svendsen: Technical University of Denmark
Andrei V. Lavrinenko: Technical University of Denmark
Osamu Takayama: Technical University of Denmark

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract 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.

Date: 2024
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DOI: 10.1038/s41467-024-54929-0

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