Optical gain and stimulated emission in nanocrystal quantum dots
Optical gain and stimulated emission in nanocrystal quantum dots
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DOI：
10.1126/science.290.5490.314
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发表时间：
2000-10-13
期刊：
影响因子：
56.9
通讯作者：
Bawendi, MG
中科院分区：
文献类型：
--
作者：
Klimov, VI;Mikhailovsky, AA;Bawendi, MG
化学合成半导体纳米粒子的光增益研究进展作为实现量子点激光器的第一步，人们对量子点进行了深入的研究。我们研究了量子点中光放大和激光的竞争动力学过程，发现尽管存在高效的本征非辐射俄歇复合，大的光学增益可以开发在发射跃迁的波长为这些点的紧密堆积的固体。窄带受激发射与一个明显的增益阈值在波长可调的大小的量子限制效应的预期，观察。这些结果明确地证明了量子点激光器的可行性。
The development of optical gain in chemically synthesized semiconductor nanoparticles (nanocrystal quantum dots) has been intensely studied as the first step toward nanocrystal quantum dot Lasers, We examined the competing dynamical processes involved in optical amplification and Lasing in nanocrystal quantum dots and found that, despite a highly efficient intrinsic nonradiative Auger recombination, Large optical gain can be developed at the wavelength of the emitting transition for close-packed solids of these dots. Narrowband stimulated emission with a pronounced gain threshold at wavelengths tunable with the size of the nanocrystal was observed, as expected from quantum confinement effects. These results unambiguously demonstrate the feasibility of nanocrystal quantum dot lasers.