title: Non-phase-matched enhancement of second-harmonic generation in multilayer nonlinear structures with internal reflections.
abstract: Traditional notions of second-harmonic generation rely on phase matching or quasi phase matching to achieve good conversion efficiencies. We present an entirely new concept for efficient second-harmonic generation that is based on the interference of counterpropagating waves in multilayer structures. Conversion efficiencies are an order of magnitude larger than with phase-matched second-harmonic generation in similar multilayer structures.
authors.affiliation: Dipartimento di Energetica, Università di Roma La Sapienza, Via Scarpa 16, 00161 Rome, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Centini
authors.forename: Giuseppe
authors.initials: G
authors.lastname: D'Aguanno
authors.forename: Letizia
authors.initials: L
authors.lastname: Sciscione
authors.forename: Concita
authors.initials: C
authors.lastname: Sibilia
authors.forename: Mario
authors.initials: M
authors.lastname: Bertolotti
authors.forename: Michael
authors.initials: M
authors.lastname: Scalora
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Bloemer