利用金作为反射镜的氧化锌纳米棒光泵激光

摘要

ZnO nanorods were grown on a thin Au layer by hydrothermal method.In the photoluminescence (PL)spectrum,a strong UV emission and a weak deep-level emission were observed.The optically pumped lasing could be detected in ZnO nanorods.The integrated intensity of the spectra increases nonlinearly with the excitation power density,which indicated there exists the stimulated emission.And multi-mode emission peaks emerged when the excitation power density exceeded the threshold.Using Au layer as mirror,the light loss was further decreased,which resulted in the decrease of the laser threshold to 31.2 kW/cm2.%通过水热法在溅射了一层金的Si片上生长了ZnO纳米棒.实验观察到ZnO纳米棒的室温光致发光谱中出现了强的紫外发射峰,同时还伴随有弱的缺陷相关的发射,这表明通过该种方法生长的ZnO纳米棒晶体质量较好.同时,通过光泵浦也观察到了ZnO纳米棒中的激光发射.当激发光功率密度超过阈值,且进一步增加时则出现多个发射峰,其积分强度随着激发功率密度的增大呈非线性增长,进一步表明存在受激发射.利用金属层作为反射镜可以进一步降低损耗,从而达到降低阈值的目的.