Read/write all-optical buffer by self-trapped gap simultons
Stationary two-colour gap solitons, or simultons, can be excited through nonlinearly induced Bragg localisation in media for second harmonic generation. Such trapped states can be ‘written’ in the structure through the inelastic collision of counterpropagating pulses at the fundamental frequency, and can be ‘read’ and ‘erased’ by launching another pulse of similar characteristics.