title: Enhancement of two-photon emission in photonic crystals.
abstract: We report the influence of photonic stopgaps on two-photon excited emission from highly efficient nonlinear chromophores infiltrated into high-quality photonic crystals. We have observed a sharp decrease (filter effect) in emission within the frequency range and direction of the stopgap as well as sharp enhancement of the two-photon excited emission associated with the stopgap's edge. This effect may be important for the development of low-threshold upconversion lasers.
authors.forename: Przemyslaw
authors.initials: P
authors.lastname: Markowicz
authors.forename: Christopher
authors.initials: C
authors.lastname: Friend
authors.forename: Yuzhen
authors.initials: Y
authors.lastname: Shen
authors.forename: Jacek
authors.initials: J
authors.lastname: Swiatkiewicz
authors.forename: Paras N
authors.initials: PN
authors.lastname: Prasad
authors.forename: Ovidiu
authors.initials: O
authors.lastname: Toader
authors.forename: Sajeev
authors.initials: S
authors.lastname: John
authors.forename: Robert W
authors.initials: RW
authors.lastname: Boyd