Super-Resolution Structured Pump–Probe Microscopy

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• 作者：Eric S. Massaro ; Andrew H. Hill ; Erik M. Grumstrup
• 刊名：ACS Photonics
• 出版年：2016
• 出版时间：April 20, 2016
• 年：2016
• 卷：3
• 期：4
• 页码：501-506
• 全文大小：530K
• 年卷期：0
• ISSN：2330-4022

文摘

Imaging excited-state dynamics in complex materials provides an important avenue for understanding the role played by micro- and nanoscale structural and compositional heterogeneity in the performance of active electronic and optoelectronic devices. Here, we develop structured pump–probe microscopy (SPPM), a subdiffraction-limited, time-resolved microscopy that incorporates a focused diffraction-limited probe field together with a spatially modulated pump excitation field. We apply the technique to study free carrier dynamics in silicon nanowires, demonstrating far-field ultrafast time-resolved spectroscopy with a 114 nm point-spread function while remaining in the perturbative excitation regime. We predict SPPM will provide an accessible approach for characterizing the ultrafast dynamics of subwavelength regions in complex materials systems.