Chirp-controlled ultrafast optical nonlinearities in semiconductors
Chirp-controlled ultrafast optical nonlinearities in semiconductors
复制标题
半导体中线性调频控制的超快光学非线性
DOI：
10.1063/1.122660
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
U. Keller
中科院分区：
文献类型：
--
作者：
J. Kunde;U. Siegner;S. Arlt;F. Morier;U. Keller
我们的实验表明，差分传输（DT）响应的体半导体激发远高于带边可以操纵的宽带激发和读出脉冲的啁啾。特别是，光谱积分DT实验中的最大透射变化可以在20 fs时间尺度上进行修改。光谱分辨DT研究解释了这种啁啾依赖性。根据啁啾的符号，在低或高光子能量下的正或负DT贡献在零时间延迟附近以不同的效率被探测。这些结果表明，啁啾可以成为一个额外的自由度，优化器件性能的超快全光开关。
We experimentally demonstrate that the differential transmission (DT) response of bulk semiconductors excited well above the band edge can be manipulated by chirping of the broadband excitation and readout pulses. In particular, the maximum transmission change in spectrally integrated DT experiments can be modified on the 20 fs time scale. Spectrally resolved DT studies explain this chirp dependence. Depending on the sign of the chirp, positive or negative DT contributions at low or high photon energies are probed with varying efficiency around zero time delay. These results demonstrate that chirp can become an additional degree of freedom for the optimization of device performance in ultrafast all-optical switching.