Fig. 3: Polarization-independent near-UV self-accelerating beam generators.
From: Low-loss metasurface optics down to the deep ultraviolet region
a Schematic representation of the generation of a self-accelerating beam by a metasurface, B364 or B325, under normal-incidence, plane-wave illumination at λ0 = 364 or 325 nm, respectively. b Measured transverse deflection in different z planes (ranging from 2.5 to 5.5 mm, with an increment of 0.5 mm) for the illumination of B364 and B325, respectively, at respective operation wavelengths λ0 = 364 and 325 nm. The error bars denote one standard deviation of the measured data. The targeted beam trajectory, \(d = 9z^2\), is shown for reference. c Measured and computed xy-plane intensity distributions (normalized) at different z planes for both devices at their designated wavelengths of operation. Each distribution is displayed over an equal square area with a side length of 120 µm but shifted along the −xy direction as a function of increasing z, such that the center of the main lobe maintains an invariant position within each image
