title: Distributed feedback micro-laser array: helixed liquid crystals embedded in holographically sculptured polymeric microcavities.
abstract: We report a detailed physical characterization of a novel array of organic distributed feedback microcavity lasers possessing a high ratio between the quality factor Q of the resonant cavity and its volume V. The optical microcavity was obtained by confining self-organized mesophases doped with fluorescent guest molecules into holographically patterned polymeric microchannels. The liquid crystal microchannels act as mirror-less cavity lasers, where the emitted laser light propagates along the liquid crystal helical axis behaving as Bragg resonator. This miniaturization process allows us to obtain a micro-laser array possessing an ultralow lasing threshold (25nJ/pulse) while having directional control on the lasing emission, a fine wavelength tunability and the control over the emission intensity.
authors.forename: Valentin
authors.initials: V
authors.lastname: Barna
authors.forename: Roberto
authors.initials: R
authors.lastname: Caputo
authors.forename: Antonio
authors.initials: A
authors.lastname: De Luca
authors.forename: Nicola
authors.initials: N
authors.lastname: Scaramuzza
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Strangi
authors.forename: Carlo
authors.initials: C
authors.lastname: Versace
authors.forename: Cesare
authors.initials: C
authors.lastname: Umeton
authors.forename: Roberto
authors.initials: R
authors.lastname: Bartolino
authors.forename: Gabriel Noam
authors.initials: GN
authors.lastname: Price