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Generation of vectorial vortex beams with switchable radial and azimuthal polarizations

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In this work, we designed and experimentally demonstrated a silicon nitride microring resonator on top of which angular array of holes acting as grating elements are embedded to generate vectorial vortex beams. Such grating structure is fabricated during a simple reactive-ion etch process induced by lag-effect. The device is capable of generating broad-band radially and azimuthally polarized vortex beams by switching the polarization and wavelength of the excited WGMs.

© 2017 Optical Society of America

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