23 February 2013 Terahertz and mid-infrared photoexpansion nanospectroscopy
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We report a method of taking mid-infrared and terahertz spectra on nanoscale using compact mW-level sources, such as quantum cascade lasers, and a standard atomic force microscope (AFM). Light absorption is detected via deflection of an AFM cantilever due to local sample thermal expansion. The spatial resolution is principally determined by the diameter of the high-intensity spot in the vicinity of a sharp metalized AFM tip, and is below 50nm. To enable detection of minute sample expansion, the repetition rate of the laser pulses is moved in resonance with the cantilever mechanical frequency. The technique requires no optical detectors.
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Feng Lu, Feng Lu, Mingzhou Jin, Mingzhou Jin, Mohammed Salih, Mohammed Salih, Paul Dean, Paul Dean, Suraj Khanna, Suraj Khanna, Lianhe H. Li, Lianhe H. Li, Giles Davies, Giles Davies, Edmund H. Linfield, Edmund H. Linfield, Mikhail A. Belkin, Mikhail A. Belkin, "Terahertz and mid-infrared photoexpansion nanospectroscopy ", Proc. SPIE 8585, Terahertz and Ultrashort Electromagnetic Pulses for Biomedical Applications, 858509 (23 February 2013); doi: 10.1117/12.2000743; https://doi.org/10.1117/12.2000743

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