Helico-conical optical beams self-heal
  An optical beam is said to be self-healing when, distorted by an obstacle, the beam corrects itself upon propagation. In this letter, we show through experiments supported by numerical simulations, that Helico-conical optical beams (HCOBs) self-heal. We observe the strong resilience of these beams with different types of obstructions, and relate this to the characteristics of their transverse energy flow. 
N. Hermosa, C. Rosales-Guzm\'an, and J. P. Torres
physics.optics