光学系统设计论文英文文献

图3显示数据归一化瞬态反射率的增加(unannealed)氧化锌层, which appeared quite different from aforementioned results obtained from the annealed ZnO sample. 出现上述结果不同从退火氧化锌样品。 The initial positive change of the pump-probe signals observed in Fig. 2 did not appear in the as 最初的积极的变化中观察到的信号pump-probe图2里没有出现 grown ZnO. 摘要增长。 For this sample, we can also observe the fast negative increase in the differential 这个样本,我们就能观察增加的快速负微分 reflectivity, which approached the maximum at a comparable delay time after photoexcitation, but 反射率,相当接近最大值延迟时间photoexcitation后,但 showed decreased peak amplitudes by a factor of about 2 with comparison to the case of the 振幅峰值下降了大约2个因子,进行的情况 annealed ZnO at the same injected carrier densities. 退火氧化锌在同一个注射载体密度较高。 The above observation on the as grown ZnO is 上述观察生长的氧化锌 believed to result from a larger intrinsic defect density generated during the epitaxial growth. 据信是源于一个更大的内在缺陷密度磊晶成长过程中产生。 As 作为 evidenced on GaAs-based compounds,23 at a higher defect density the band structure is modified to 在这GaAs-based化合物、23在更高的缺陷密度能带结构中被修改 increased density of the near band-edge states, which in turn alters the magnitude of the band-edge附近的密度增加,从而改变美国的大小 contribution to Δn due to the BGR as well BF effects. 由于Δn贡献以及BGR高炉效果。 It is to find out that the signal recovery of the 是发现信号恢复 as grown sample is characterized by a much faster decay and sign reversal within the first delay of 作为成长样品的特点是快得多的蛀牙和签下逆转在第一个延迟 ~24 ps before following a slowly recovering component. ~ 24帕特-西蒙兹在在慢慢恢复组成部分。 The prevalence of the initial much faster 最初的流行快得多 decay pointed to a larger density of intrinsic shallow defects, which produced a larger band tail in 指出了更大的密度衰变的内在浅缺陷,而产生了一个更大的乐队的尾巴 the as grown ZnO, and then increased the phase space available for exciton relaxation. 增长的氧化锌,然后增加了相空间供重放松一下。 Similar to 类似 GaAs grown at low temperature,24 the slowly recovering component observed in the ? 增长材料温度低、24日慢慢恢复组件中观测到的? ΔR / R ΔR / R signals of the as grown ZnO layer was interpreted as arising from the reexcitation of the trapped 信号的氧化锌层被解读为增长而产生的reexcitation被困住的 carriers into the conduction and/or valence bands by absorbing the probe light. 车进入冲动的传导和/或价乐队吸收探测器的光。

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