24 August 2017 High-Q resonances with low azimuthal indices in all-dielectric high-index nanoparticles
Author Affiliations +
Recently, a novel class of high-Q optical resonators based on all-dielectric subwavelength nanoparticles with high refractive index has been proposed [M. V. Rybin, et al, arXiv:1706.02099, 2017]. Here we study a complex spectrum of such nanoscale resonators by means of the resonant-state expansion, treating the problem as a nonHermitian eigenproblem. We show that the high-Q features can be described within the mechanism of external coupling of open channels via the continuum. For ceramic resonators with permittivity ε = 40, we demonstrate that the quality factor of a trapped mode with a low azimuthal index could reach the value Q = 104 .
Conference Presentation
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Kirill L. Koshelev, Kirill L. Koshelev, Andrey A. Bogdanov, Andrey A. Bogdanov, Zarina F. Sadrieva, Zarina F. Sadrieva, Kirill B. Samusev, Kirill B. Samusev, Mikhail V. Rybin, Mikhail V. Rybin, Mikhail F. Limonov, Mikhail F. Limonov, Yuri S. Kivshar, Yuri S. Kivshar, } "High-Q resonances with low azimuthal indices in all-dielectric high-index nanoparticles", Proc. SPIE 10343, Metamaterials, Metadevices, and Metasystems 2017, 103430F (24 August 2017); doi: 10.1117/12.2272375; https://doi.org/10.1117/12.2272375

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