Optomechanics of a stable diffractive axicon light sail Prateek R. Srivastava and Grover A. Swartzlander Jr. Eur. Phys. J. Plus, 135 7 (2020) 570 Published online: 14 July 2020 DOI: 10.1140/epjp/s13360-020-00542-1