title: Negative group velocity and three-wave mixing in dielectric crystals.
abstract: We investigate extraordinary features of optical parametric amplification of Stokes electromagnetic waves that originate from the three-wave mixing of a backward phonon wave with negative group velocity and two ordinary electromagnetic waves. Such properties were earlier shown to exist only in plasmonic negative-index metamaterials that are very challenging to fabricate. Nonlinear optical photonic devices with properties similar to those predicted for negative-index metamaterials are proposed.
authors.affiliation: Siberian Federal University, 660041 Krasnoyarsk, Russia.
authors.forename: Mikhail I
authors.initials: MI
authors.lastname: Shalaev
authors.forename: Sergey A
authors.initials: SA
authors.lastname: Myslivets
authors.forename: Vitaly V
authors.initials: VV
authors.lastname: Slabko
authors.forename: Alexander K
authors.initials: AK
authors.lastname: Popov