Here’s a paper not written by the author showing evidence that light has mass and therefore exerts a force, in line with the author’s hypothesis that each wavelength of light has a mass of h/c^2 (h is in Joules, not Joule seconds)
W. She, J. Yu, R. Feng, Observation of a Push Force on the End Face of a Nanometer Silica Filament Exerted by Outgoing Light, Physical Review Letters, 2008, Vol. 101
