title: Color-tunable organic microcavity laser array using distributed feedback.
abstract: Distributed feedback microstructures play a fundamental role in confining and manipulating light to obtain lasing in media with gain. Here, we present an innovative array of organic, color-tunable microlasers which are intrinsically phase locked. Dye-doped helixed liquid crystals were embedded within periodic, polymeric microchannels sculptured by light through a single-step process. The helical superstructure was oriented along the microchannels; the lasing was observed along the same direction at the red edge of the stop band. Several physical and technological advantages arise from this engineered heterostructure: a high quality factor of the cavity, ultralow lasing threshold, and thermal and electric control of the lasing wavelength and emission intensity. This level of integration of guest-host systems, embedded in artificially patterned small sized structures, might lead to new photonic chip architectures.
authors.affiliation: LICRYL-INFM and Center of Excellence CEMIF.CAL, Department of Physics, University of Calabria, I-87036 Rende (CS), Italy. Strangi@fis.unical.it
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Strangi
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: Carlo
authors.initials: C
authors.lastname: Versace
authors.forename: Nicola
authors.initials: N
authors.lastname: Scaramuzza
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