Coextrusion has been used to prepare multilayered polymeric films that display a photonic band gap whose position and shape can be controlled by changing layer thickness, which is achieved by adjusting processing conditions or by post processing biaxial stretching. In combination with organic fluorescent dyes, these films have been used to fabricate both distributed Bragg reflector (DFB) and distributed feedback (DFB) lasers. Both architectures displayed low lasing thresholds and high efficiencies, with DBR lasers outperforming the DFB lasers.
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