30 January 2014 Near-field diffraction of laser light by dielectric corner step
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The diffraction of a linearly polarized plane wave by a corner dielectric microstep of height equals of two incident wavelengths was studied using finite-difference time domain method and near-field scanning optical microscopy. It was shown that the corner step generates an elongated region of enhanced intensity, termed as a curved laser microjet. The curved laser microjet has a length of about DOF = 9.5λ and the smallest diameter FWHM = (1.94±0.15)λ at distance z = 5.5λ.
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S. Stafeev, S. Stafeev, V. Kotlyar, V. Kotlyar, A. Kovalev, A. Kovalev, "Near-field diffraction of laser light by dielectric corner step", Proc. SPIE 9031, Saratov Fall Meeting 2013: Optical Technologies in Biophysics and Medicine XV; and Laser Physics and Photonics XV, 90311A (30 January 2014); doi: 10.1117/12.2051462; https://doi.org/10.1117/12.2051462

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