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Proceedings Paper

Terahertz and mid-infrared photoexpansion nanospectroscopy
Author(s): Feng Lu; Mingzhou Jin; Mohammed Salih; Paul Dean; Suraj Khanna; Lianhe H. Li; Giles Davies; Edmund H. Linfield; Mikhail A. Belkin
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Paper Abstract

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.

Paper Details

Date Published: 23 February 2013
PDF: 6 pages
Proc. SPIE 8585, Terahertz and Ultrashort Electromagnetic Pulses for Biomedical Applications, 858509 (23 February 2013); doi: 10.1117/12.2000743
Show Author Affiliations
Feng Lu, Univ. of Texas at Austin (United States)
Mingzhou Jin, Univ. of Texas at Austin (United States)
Mohammed Salih, Univ. of Leeds (United Kingdom)
Paul Dean, Univ. of Leeds (United Kingdom)
Suraj Khanna, Univ. of Leeds (United Kingdom)
Lianhe H. Li, Univ. of Leeds (United Kingdom)
Giles Davies, Univ. of Leeds (United Kingdom)
Edmund H. Linfield, Univ. of Leeds (United Kingdom)
Mikhail A. Belkin, Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 8585:
Terahertz and Ultrashort Electromagnetic Pulses for Biomedical Applications
Gerald J. Wilmink; Bennett L. Ibey, Editor(s)

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