Opposite directionality of the Poynting vector and the wave vector, an inherent property of negative index metamaterials (NIMs), was predicted to enable backward phase-matching condition for a second harmonic generation (SHG) process. As a result, such a nonlinear negative index slab acts as a nonlinear mirror. In this Letter, we predict that SHG with structured light carrying orbital angular momentum (OAM) and propagating in NIMs results in a possibility of generating a backward propagating beam with simultaneously doubled frequency, OAM, and reversed rotation direction of the wavefront. These results may find applications in high-dimensional communication systems, quantum information processing, and optical manipulation on a nanoscale.
© 2013 Optical Society of America
Original Manuscript: June 12, 2013
Revised Manuscript: July 23, 2013
Manuscript Accepted: August 31, 2013
Published: October 18, 2013
Mikhail I. Shalaev, Zhaxylyk A. Kudyshev, and Natalia M. Litchinitser, "Twisted light in a nonlinear mirror," Opt. Lett. 38, 4288-4291 (2013)