Abstract
Published experimental studies on femtosecond two-beam interference on metal and dielectric surfaces accompanied by the formation of additional diffractive nanostructures with substantially subwavelength spatial periods are analyzed. The formation of additional structures is explained using modern concepts of excitation of spatial (Bloch) modes of localized surface plasmon polaritons and evanescent waves guided by dynamic ridges (indents) of the interference relief. The simplicity of the experimental realization of the controllable formation of ordered nanostructures with dimensions substantially exceeding the classic Abbe diffraction limit allows their use for the development of devices with new functional properties, including quantum devices.
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