Electrically switchable lasing from pyrromethene 597 embedded holographic-polymer dispersed liquid crystals

Jakubiak, Rachel; Natarajan, Lalgudi V.; Tondiglia, Vincent; He, Guang S.; Prasad, Paras N.; Bunning, Timothy J.; Vaia, Richard A.
December 2004
Applied Physics Letters;12/20/2004, Vol. 85 Issue 25, p6095
Academic Journal
One-dimensional photonic band gap (PBG) materials created from holographic polymer dispersed liquid crystals (H-PDLCs) provide enhanced light localization in an organic electro-optic device. Distributed feedback within the reflection notch of a H-PDLC grating narrowed the bandwidth of pyrromethene 597 fluorescence from 56 to 8.4 nm at a lasing threshold of 0.12 mJ cm-2, compared to 2.6 mJ cm-2 required to observe amplified spontaneous emission in a nonstructured, but comparable floodlit (PDLC) sample. Application of an electric field (10–40 V/μm) continuously decreased the diffraction efficiency of the grating and the commensurate dynamic lasing intensity thus demonstrating electrically modulated gain from an optically pumped, all-organic PBG.


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