Chu Saisai, Hayat Anwer, Cao Fengzhao, Zhai Tianrui
State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China.
Institute of Information Photonics Technology, College of Applied Sciences, Beijing University of Technology, Beijing 100124, China.
Materials (Basel). 2021 Apr 29;14(9):2318. doi: 10.3390/ma14092318.
In recent years, conjugated polymers have become the materials of choice to fabricate optoelectronic devices, owing to their properties of high absorbance, high quantum efficiency, and wide luminescence tuning ranges. The efficient feedback mechanism in the concentric ring resonator and its circularly symmetric periodic geometry combined with the broadband photoluminescence spectrum of the conjugated polymer can generate a highly coherent output beam. Here, the detailed design of the ultralow-threshold single-mode circular distributed feedback polymer laser is presented with combined fabrication processes such as electron beam lithography and the spin-coating technique. We observe from the extinction spectra of the circular gratings that the transverse electric mode shows no change with the increase of incident beam angle. The strong enhancement of the conjugated polymer photoluminescence spectra with the circular periodic resonator can reduce the lasing threshold about 19 µJ/cm. A very thin polymer film of about 110 nm is achieved with the spin-coating technique. The thickness of the gain medium can support only the zero-order transverse electric lasing mode. We expect that such a low threshold lasing device can find application in optoelectronic devices.
近年来，共轭聚合物因其具有高吸收率、高量子效率和宽发光调谐范围等特性，已成为制造光电器件的首选材料。同心环谐振器中的高效反馈机制及其圆对称周期性几何结构，与共轭聚合物的宽带光致发光光谱相结合，能够产生高度相干的输出光束。在此，通过电子束光刻和旋涂技术等组合制造工艺，展示了超低阈值单模圆形分布反馈聚合物激光器的详细设计。我们从圆形光栅的消光光谱中观察到，横向电模不随入射光束角度的增加而变化。共轭聚合物光致发光光谱与圆形周期谐振器的强烈增强作用可将激光阈值降低约19 μJ/cm。通过旋涂技术可制备出约110 nm的非常薄的聚合物薄膜。增益介质的厚度仅能支持零阶横向电激光模式。我们期望这样的低阈值激光器件能够在光电器件中得到应用。
