Light enhancement by quasi-bound states in the continuum in dielectric arrays

Bulgakov, Evgeny N.; Maksimov, Dmitrii N. OPTICS EXPRESS, 25 (13):14134-14147; Doi: 10.1364/OE.25.014134 JUN 26 2017

The article reports on light enhancement by structural resonances in linear periodic arrays of identical dielectric elements. As the basic elements both subwavelength spheres and rods with circular cross section have been considered. In either case it has been demonstrated numerically that high-Q structural resonant modes originated from bound states in the continuum enable near-field amplitude enhancement by factor of 10–25 in the red-to-near infrared range in lossy silicon. The asymptotic behavior of the Q-factor with the number of elements in the array is explained theoretically by analyzing quasi-bound states propagation bands.

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