Polychromatic optical Bloch oscillations.
Bloch oscillations (BOs) of polychromatic beams in circularly curved optical waveguide arrays are smeared out owing to the dependence of the BO spatial period on the wavelength. Here it is shown that restoring of the self-imaging property of the array and approximate BOs over relatively broad spectral ranges can be achieved by the insertion of suitable lumped phase slips uniformly applied across the array.
Longhi
Stefano
S
Dipartimento di Fisica, Politecnico di Milano, Milano, Italy. longhi@fisi.polimi.it