Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 121, Issue 44, Pages 10249-10255Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.7b09570
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Funding
- Keck Foundation Science and Engineering grant
- UCAS Joint Ph.D. Training Program [UCAS [2015]37]
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Using a visible beam to probe the thermal effect induced by infrared absorption, mid-infrared photothermal (MIP) microscopy allows bond-selective chemical imaging at submicron spatial resolution. Current MIP microscopes cannot reach the high wavenumber region due to the limited tunability of the existing quantum cascade laser source. We extend the spectral range of MIP microscopy by difference frequency generation (DFG) from two chirped femtosecond pulses. Flexible wavelength tuning in both C-D and C-H regions was achieved with mid-infrared power up to 22.1 mW and spectral width of 29.3 cm(-1). Distribution of fatty acid in live human lung cancer cells was revealed by MIP imaging of the C-D bond at 2192 cm(-1).
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