Centini, MarcoD’Aguanno, GiuseppeSciscione, LetiziaSibilia, ConcitaBertolotti, MarioScalora, MichaelBloemer, Mark J.2020-06-042020-06-04Marco Centini, Giuseppe D’Aguanno, Letizia Sciscione, Concita Sibilia, Mario Bertolotti, Michael Scalora, and Mark J. Bloemer, "Non-phase-matched enhancement of second-harmonic generation in multilayer nonlinear structures with internal reflections," Opt. Lett. 29, 1924-1926 (2004), https://doi.org/10.1364/OL.29.001924https://doi.org/10.1364/OL.29.001924http://hdl.handle.net/11603/18817Traditional 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.3 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Public Domain Mark 1.0This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.Text