title: High performance organic distributed Bragg reflector lasers fabricated by dot matrix holography.
abstract: We report distributed Bragg reflector (DBR) polymer lasers fabricated using dot matrix holography. Pairs of distributed Bragg reflector mirrors with variable mirror separations are fabricated and a novel energy transfer blend consisting of a blue-emitting conjugated polymer and a red-emitting one is spin-coated onto the patterned substrate to complete the device. Under optical pumping, the device emits sing-mode lasing around 622 nm with a bandwidth of 0.41 nm. The working threshold is as low as 13.5 μJ/cm² (~1.68 kW/cm²) and the measured slope efficiency reaches 5.2%. The distributed feedback (DFB) cavity and the DBR cavity resonate at the same lasing wavelength while the DFB laser shows a much higher threshold. We further show that flexible DBR lasers can be conveniently fabricated through the UV-imprinting technique by using the patterned silica substrate as the mold. Dot matrix holography represents a versatile approach to control the number, the size, the location and the orientation of DBR mirrors, thus providing great flexibility in designing DBR lasers.
authors.forename: Wenqiang
authors.initials: W
authors.lastname: Wan
authors.forename: Wenbin
authors.initials: W
authors.lastname: Huang
authors.forename: Donglin
authors.initials: D
authors.lastname: Pu
authors.forename: Wen
authors.initials: W
authors.lastname: Qiao
authors.forename: Yan
authors.initials: Y
authors.lastname: Ye
authors.forename: Guojun
authors.initials: G
authors.lastname: Wei
authors.forename: Zongbao
authors.initials: Z
authors.lastname: Fang
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Zhou
authors.forename: Linsen
authors.initials: L
authors.lastname: Chen