Laser mode feeding by shaking quantum dots in a planar microcavity
Laser mode feeding by shaking quantum dots in a planar microcavity
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DOI：
10.1038/nphoton.2011.269
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发表时间：
2012-01-01
期刊：
影响因子：
35
通讯作者：
Bayer, M.
中科院分区：
文献类型：
--
作者：
Brueggemann, C.;Akimov, A. V.;Bayer, M.
半导体光发射在光学谐振器(1)中可以发生显着变化。先决条件是光产生中涉及的电子跃迁与腔模式共振。虽然可以通过专门的制造来安排共振，但在某些情况下这实际上是不可能的。作为一个例子，我们研究了一个包含不均匀量子点集合的平面微腔，其光谱展宽远大于光学模式宽度，因此仅对微小的点部分实现了共振。尽管如此，在适度的光泵浦下仍可以跨越激光阈值。我们证明，超快声学技术产生的应变脉冲可用于调制跃迁能量，以便动态地引发与光学模式的共振，以获得更大的点分数。因此，发射输出可以提高两个数量级以上，这对于调制光源可能有用。
Semiconductor light emission can be changed considerably in an optical resonator(1). Prerequisite is that the electronic transitions involved in light generation are in resonance with a cavity mode. Although resonance can be arranged through dedicated fabrication, there are cases where this is virtually impossible. As an example, we study a planar microcavity containing an inhomogeneous quantum dot ensemble with a spectral broadening much larger than the optical mode width, so that resonance is achieved for a tiny dot fraction only. Still, the laser threshold can be crossed at moderate optical pumping. We demonstrate that strain pulses generated by ultrafast acoustics techniques can be used to modulate the transition energies so that resonance with the optical mode is dynamically induced for a much larger dot fraction. As a result, the emission output can be enhanced by more than two orders of magnitude, which is potentially useful for modulating light sources.