Distributed feedback micro-laser array: helixed liquid crystals embedded in holographically sculptured polymeric microcavities.
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.
Barna
Valentin
V
Caputo
Roberto
R
De Luca
Antonio
A
Scaramuzza
Nicola
N
Strangi
Giuseppe
G
Versace
Carlo
C
Umeton
Cesare
C
Bartolino
Roberto
R
Price
Gabriel Noam
GN