Large enhancement of interface second-harmonic generation near the zero-n(-) gap of a negative-index Bragg grating.
We predict a large enhancement of interface second-harmonic generation near the zero-n(-) gap of a Bragg grating made of alternating layers of negative- and positive-index materials. Field localization and coherent oscillations of the nonlinear dipoles located at the structure's interfaces conspire to yield conversion efficiencies at least an order of magnitude greater than those achievable in the same length of nonlinear, phase-matched bulk material. These findings thus point to a new class of second-harmonic-generation devices made of standard centrosymmetric materials.
D'Aguanno
Giuseppe
G
Charles M. Bowden Research Center, RDECOM Building 7804, Redstone Arsenal, AL 35898-5000, USA. giuseppe.daguanno@gmail.com
Mattiucci
Nadia
N
Bloemer
Mark J
MJ
Scalora
Michael
M