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We experimentally and theoretically analyze the role of substrate on the optical bound states in the continuum (BICs). We reveal that a high-index substrate could destroy even in-plane symmetry protected BIC due to leakage into the diffraction channels opening in the substrate. We show how two concurrent loss mechanisms scattering due to surface roughness and leakage into substrate contribute to the...
In this work we investigate lateral optical binding of two dielectric nanoparticles placed above a metallic substrate. We consider both longitudinal and lateral components of the optical binding force. Dyadic Green's function was used to describe analytically field distribution in the near and far field zone. Equilibrium positions for dielectric particles were calculated and contribution of metallic...
Cylindrical resonators fabricated by direct laser writing and supporting whispering gallery modes are analyzed numerically and experimentally using dark-field spectroscopy. Electric field intensity distribution corresponding to the whispering gallery modes is observed directly in scattered radiation in the visible spectrum range. In the the dark-field spectroscopy experiments, we observed beating...
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