期刊
APPLIED PHYSICS LETTERS
卷 101, 期 4, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4737942
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资金
- NIH [1 R21 EB013381-01]
- NSF I/UCRC [NSF IIP-1068070]
- ASD R&E under Air Force [FA8721-05-C-0002]
- Directorate For Engineering
- Div Of Industrial Innovation & Partnersh [1068070] Funding Source: National Science Foundation
We report a technique to measure the mid-infrared photothermal response induced by a tunable quantum cascade laser in the neat liquid crystal 4-octyl-4'-cyanobiphenyl (8CB), without any intercalated dye. Heterodyne detection using a Ti:sapphire laser of the response in the solid, smectic, nematic and isotropic liquid crystal phases allows direct detection of a weak mid-infrared normal mode absorption using an inexpensive photodetector. At high pump power in the nematic phase, we observe an interesting peak splitting in the photothermal response. Tunable lasers that can access still stronger modes will facilitate photothermal heterodyne mid-infrared vibrational spectroscopy. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4737942]
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