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23 Jul 2012

Volume 101, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 101, 043101 (2012); http://dx.doi.org/10.1063/1.4737152 (4 pages)

Toshiaki Tanigaki, Yoshikatsu Inada, Shinji Aizawa, Takahiro Suzuki, Hyun Soon Park, Tsuyoshi Matsuda, Akira Taniyama, Daisuke Shindo, and Akira Tonomura
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Mid-infrared photothermal heterodyne spectroscopy in a liquid crystal using a quantum cascade laser

Alket Mërtiri, Thomas Jeys, Vladimir Liberman, M. K. Hong, Jerome Mertz, Hatice Altug, and Shyamsunder Erramilli

Appl. Phys. Lett. 101, 044101 (2012); http://dx.doi.org/10.1063/1.4737942 (4 pages)

Online Publication Date: 23 July 2012

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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.
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85.60.Gz Photodetectors (including infrared and CCD detectors)
07.20.-n Thermal instruments and apparatus

The capture of flowing microbubbles with an ultrasonic tap using acoustic radiation force

B. Raiton, J. R. McLaughlan, S. Harput, P. R. Smith, D. M. J. Cowell, and S. Freear

Appl. Phys. Lett. 101, 044102 (2012); http://dx.doi.org/10.1063/1.4739514 (4 pages)

Online Publication Date: 27 July 2012

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The accumulation of 1–10 μm phospholipid-shelled microbubbles was demonstrated by creating an “ultrasonic tap” using acoustic travelling waves. Microbubbles were flowed through a 200 μm cellulose tube at rates ranging between 14–50 ml/h, in order to approximate the velocities and wall shear rates found throughout the human circulatory system. The generated acoustic radiation force directly opposing the flow direction was sufficient to hold microbubbles in a fluid flow up to 28 cm/s. Clusters of microbubbles subject to wall shear rates of up to 9000 s−1 were retained near a pressure null for several seconds.
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87.85.Ox Biomedical instrumentation and transducers, including micro-electro-mechanical systems (MEMS)
43.25.Qp Radiation pressure
43.35.Yb Ultrasonic instrumentation and measurement techniques
43.80.Vj Acoustical medical instrumentation and measurement techniques
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