title: Energy exchange properties during second-harmonic generation in finite one-dimensional photonic band-gap structures with deep gratings.
abstract: We study second-harmonic generation in finite, one-dimensional, photonic band-gap structures with large index contrast in the regime of pump depletion and global phase-matching conditions. We report a number of surprising results: above a certain input intensity, field dynamics resemble a multiwave mixing process, where backward and forward components compete for the available energy; the pump field is mostly reflected, revealing a type of optical limiting behavior; and second-harmonic generation becomes balanced in both directions, showing unusual saturation effects with increasing pump intensity. This dynamics was unexpected, and it is bound to influence the way one goes about thinking and designing nonlinear frequency conversion devices in a practical way.
authors.affiliation: INFM at Dipartimento di Energetica, Università di Roma La Sapienza, Via A. Scarpa 16, I-00161 Rome, Italy. giuseppe.dguanno@uniroma1.it
authors.forename: Giuseppe
authors.initials: G
authors.lastname: D'Aguanno
authors.forename: Marco
authors.initials: M
authors.lastname: Centini
authors.forename: Michael
authors.initials: M
authors.lastname: Scalora
authors.forename: Concita
authors.initials: C
authors.lastname: Sibilia
authors.forename: Mario
authors.initials: M
authors.lastname: Bertolotti
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Bloemer
authors.forename: Charles M
authors.initials: CM
authors.lastname: Bowden