Vertical cavity lasing from melt-grown crystals of cyano-substituted thiophene/phenylene co-oligomer
Vertical cavity lasing from melt-grown crystals of cyano-substituted thiophene/phenylene co-oligomer
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DOI：
10.1063/1.4934588
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发表时间：
2015-10
影响因子：
4
通讯作者：
Yosuke Tanaka;Kaname Goto;K. Yamashita;T. Yamao;S. Hotta;F. Sasaki;H. Yanagi
中科院分区：
文献类型：
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作者：
Yosuke Tanaka;Kaname Goto;K. Yamashita;T. Yamao;S. Hotta;F. Sasaki;H. Yanagi
采用熔融生长的氰基取代的噻吩苯亚胺共低聚物晶体制作了垂直腔体有机激光器。由于分子取向的存在，在室温光泵浦下，在分布布拉格反射镜(DBR)上生长的半腔晶体也实现了表面发射激光。角度分辨光致发光光谱中的反交叉分裂表明腔光子和受限Frenkel激子之间形成了激子-极化子。通过构造夹在顶底DBR之间的全腔结构，将激光阈值降低到一个数量级，与半腔的阈值一样低。在阈值附近，全腔发射的时间分布塌陷为脉冲形状，并伴随着有限的开启延迟。我们根据偏振子对传统光子激光的贡献来讨论这些观察到的特征。
Vertical-cavity organic lasers are fabricated with melt-grown crystals of a cyano-substituted thiophene-phenylene co-oligomer. Due to lying molecular orientation, surface-emitting lasing is achieved even in the half-cavity crystal grown on a distributed Bragg reflector (DBR) under optical pumping at room temperature. Anticrossing splits in angle-resolved photoluminescence spectra suggest the formation of exciton-polaritons between the cavity photons and the confined Frenkel excitons. By constructing the full-cavity structure sandwiched between the top and bottom DBRs, the lasing threshold is reduced to one order, which is as low as that of the half cavity. Around the threshold, the time profile of the full-cavity emission is collapsed to a pulsed shape accompanied by a finite turn-on delay. We discuss these observed characteristics in terms of a polariton contribution to the conventional photon lasing.