Abstract
With the use of the finite-difference time-domain-based simulation and a scanning near-field optical microscope that has a metal cantilever tip, the diffraction of a linearly polarized plane wave of wavelength by a glass corner step of height is shown to generate a low divergence laser jet of a root-parabolic form: over a distance of on the optical axis, the beam path is shifted by . The curved laser jet of the FWHM length depth of has the diameter over the distance , and the intensity maximum is 5 times higher than the incident wave intensity. The discrepancy between the analytical and the experimental results amounts to 11%.
© 2013 Optical Society of America
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