Breaking the temporal resolution limit by superoscillating optical beats
  Band-limited functions can oscillate locally at an arbitrarily fast rate through an interference phenomenon known as superoscillations. Using an optical pulse with a superoscillatory envelope we experimentally break the temporal Fourier-transform limit having a temporal feature which is approximately three times shorter than the duration of a transform-limited Gaussian pulse having a comparable bandwidth while maintaining $29.5\%$ visibility. Numerical simulations demonstrate the ability of such signals to achieve temporal super-resolution. 
Yaniv Eliezer, Liran Hareli, Lilya Lobachinsky, Sahar Froim and Alon   Bahabad
physics.optics