Polycarbazoles microcavities: towards plastic blue lasers

Photodegradation of polymer-dispersed perylene di-imide dyes

“…The PMMA dispersed dye films cast on glass slides served as planar waveguides for the resulting fluorescence similar to previous studies. 17,18 The waveguided fluorescence orthogonal to laser propagation was collected via a lens and focused onto the entrance slits of a monochromator. This dispersed emission was detected by a photomultiplier (Hamamatsu R928) tube and recorded via a boxcar integrator.…”

Tridimensional Surface Relief Modulation of Polymeric Films

“…The problem is that the excimer laser presents a low spatial and temporal coherence to obtain interferometric pattern at this wavelength. To compensate the low coherence the interference pattern is produced between the diffracted beams of a phase mask (Dyer et al 1996, Castex et al 2002. The interference field pitch can be of the same order of magnitude or half as the pitch of the phase mask depending if interference take place between 0, ± 1 diffraction orders, respectively between +1 and -1 diffraction orders (Fig.…”

“…Under the 514 nm laser beam from an argon laser the surface of an azoaromatic polymer was optically altered in order to induce a highly efficient diffraction grating (Rochon et al 1995). A single step processing method for surface modulation has been developed in order to obtain submicron structures for special applications and was reported (Dyer et al, 1996), (Castex et al, 2002). There were obtained surface relief gratings on PMMA and on the polymeric materials based on carbazole chromophores in order to develop a plastic blue laser emitting around 400 nm (Castex et al 2006),.…”

Photo-sensible (thymine containing) azo-polysiloxanes: synthesis and light induced effects

“…Phtoinduced single step surface relief modulation of different photopolymers was already reported [14][15][16][17]. Generally the leading idea was to obtain diffractive optical elements with controlled pitch, usually with submicron values in materials with special applications.…”