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Abstract
We report a simple concept to implement a single-wavelength beam steering based on a liquid-cladded one-dimensional (1D) optical phased array (OPA). The beam steering was realized by modifying the waveguide mode effective index through replacing the liquid upper claddings. A prototype of a 32-channel liquid-cladded OPA was fabricated and characterized. Owing to the high refractive index range of liquids (${\gt}{0.625}$), a maximum steering angle of ${\gt}{10}^\circ$ was achieved with the liquid range from 1.0 to 1.63 at a wavelength of 940 nm. Moreover, the liquid-cladded OPA reveals a quasi-continuous beam steering range of ${\gt}{29}^\circ$ by combining the liquid cladding tuning and discrete wavelength tuning of $\lambda = {785}\;{\rm nm}$, 852 nm, and 940 nm. Further integration with optofluidic systems offers the OPA potential for low power consumption and all-fluidic beam steering operating at a single wavelength.
© 2021 Optical Society of America
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