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Converting the guided modes of Bloch surface waves with the surface pattern

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Abstract

The guided modes of Bloch surface waves, such as the transverse electric modes (TE00 and TE01 modes), can simultaneously exist in a low-refractive-index ridge waveguide with subwavelength thicknesses that are deposited on an all-dielectric one-dimensional photonic crystal. By using the finite-difference frequency-domain method, coupled mode theory, and the finite-difference time-domain method, the conversion between the guided modes has been investigated. This conversion can be realized in a broadband wavelength with the surface pattern of this low-index ridge. This conversion is useful for developing lab-on-a-chip photonic devices, such as a mode converter that can maintain the output mode purity over 90% with a working wavelength ranging from 590 to 680 nm, and a power splitter that can maintain the splitting ratio over 8:2 with a wavelength ranging from 530 to 710 nm.

© 2021 Optical Society of America

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