Waveguide two-point differential-excitation method for quantitative absorption measurements of nanostructures
Waveguide two-point differential-excitation method for quantitative absorption measurements of nanostructures
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用于纳米结构定量吸收测量的波导两点差分激发法
DOI：
10.1143/jjap.51.106601
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Ken W. West
中科院分区：
文献类型：
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作者：
Toshimitsu Mochizuki;Masahiro Yoshita;Shun Maruyama;Changsu Kim;Keisuke Fukuda;Hidefumi Akiyama;Loren N. Pfeiffer;Ken W. West
为了建立一种新的用于纳米结构的定量吸收测量方法，我们研究了最近发展起来的一种波导两点差分激发方法的定量精度，该方法结合了法布里-珀罗条纹分析和衰减内发射分析，用于差分光程长度的激发。8 nm厚的量子阱在不同温度下的定量吸收光谱与理论预测一致，相对精度在5%以内，模式吸收的高动态范围为0-210 cm-1。结果还与相同样品的常规光致发光激发光谱进行了比较，发现在低温下低估了最低激子的吸收峰强度。
To establish a new useful quantitative absorption measurement method for nanostructures, we investigated quantitative accuracy of a recently developed waveguide two-point differential-excitation method, which combines Fabry–Pérot fringe analysis and attenuated internal emission analysis for differential-path-length excitations. Quantitative absorption spectra of an 8-nm-thick GaAs quantum well at various temperatures consistent with theoretical predictions are demonstrated within 5% relative accuracy and a high dynamic range of 0–210 cm-1 in modal absorptions. The results were also compared with conventional photoluminescence excitation spectra of the same sample, which turned out to underestimate the absorption peak intensity of the lowest exciton at low temperatures.