期刊
OPTICS EXPRESS
卷 25, 期 23, 页码 28589-28611出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.25.028589
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资金
- Department of Energy (DOE) [DE-SC0018218, DE-SC0012592, DE-SC0012375]
- Moore Foundation [GBMF4533]
- U.S. Department of Energy (DOE) [DE-SC0012592, DE-SC0012375, DE-SC0018218] Funding Source: U.S. Department of Energy (DOE)
We report on the first implementation of ultrafast near field measurements carried out with the transient pseudoheterodyne detection method (Tr-pHD). This method is well suited for efficient and artifact free pump-probe scattering-type near-field optical microscopy with nanometer scale resolution. The Tr-pHD technique is critically compared to other data acquisition methods and found to offer significant advantages. Experimental evidence for the advantages of Tr-pHD is provided in the near-IR frequency range. Crucial factors involved in achieving proper performance of the Tr-pHD method with pulsed laser sources are analyzed and detailed in this work. We applied this novel method to femtosecond time-resolved and nanometer spatially resolved studies of the photo-induced effects in the insulator-to-metal transition system vanadium dioxide. (c) 2017 Optical Society of America
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