In this work modulation of laser emission from polymer
nano-structured lasers was explored
through three different optical techniques.
We show all optical control of polymer distributed feedback lasers based on polyfluorenes (PFO
and F8BT) by applying a gating pulse, which completely switch-off emission in the sub-ps time
scale. The switching mechanism is assigned to photo-injection of charge carriers induced by the
gate transition. This is a resonant non-linear process, that might work at high bit-rate, paving the
way toward plastic, large-scale integrated, ultrafast optical logic.
New opportunities may also be offered by two other techniques:
Two-photon two-color pumping
allows lasing action only in presence of two different pulses, one in the visible and one in the IR,
resonant with the second telecommunication window. This may allow to convert
telecommunication signal from a fiber to visible range and thus to Plastic Optical Fibers for organic
photonics. Another technique we explored uses a blend of F8BT and a photochromic material,
(1,2-bis-(5-phenyl-2-methyl-3-tienyl) perfluocyclopentene))(C4). With a UV pulse we are able to
change C4 structure, thus overlapping its absorption spectrum with F8BT emission and modulating
yellow ASE emission.