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May 2015

Coherent Scientific is the Australian and New Zealand distributor for Daylight Solutions, manufacturers of Quantum Cascade Lasers (QCL's) with output in the mid-infrared. These lasers are used in a growing range of applications in molecular spectroscopy, nanoscale chemical imaging and combustion diagnostics. We have set out below some recently reported research using Daylight Solutions' lasers that we thought you might find interesting. For a full list of over 80 publications using Daylight Solutions lasers, please visit their website.

Polariton Waves Imaged via NanoScale IR Chemical Imaging Technique

"Science" magazine recently featured work by researchers in the Basov group at UCSD, in which polaritonic waves were launched and detected in hexagonal boron nitride. Using a nanoscale imaging technique, in which an AFM probe was combined with a tunable mid-IR laser to obtain spectroscopic information with 20nm resolution, properties of surface phonon polaritons were studied. Altering polariton wavelength by varying the number of crystal layers in the samples, the dispersion of polaritonic waves was shown to be governed by crystal thickness according to scaling laws that persist down to a few atomic layers. See the full article.

Nano-chemical Infrared Imaging of Membrane Proteins in Lipid Bilayers

In work by the Raschke group at the University of Colorado recently reported in JACS, nanoscale chemical imaging has been applied to identify the protein distribution in a lipid bilayer with 20nm spatial resolution and few-protein sensitivity. The optical phase contrast, which emerges solely from the resonant excitation of the Amide I vibrational mode of the protein backbone, complements conventional AFM topography with the chemical specificity inherent in vibrational nanospectroscopy. While demonstrated for the base of the purple membrane in this work, this implementation can be extended to any biological structure exhibiting suitable IR-active vibrational resonance. See the full article.

Photoacoustic Spectroscopy of Surface Adsorbed Molecules Using a Nanostructured Coupled Resonator Array

Sensitive detection of explosive residues has been an area of active research. In work reported by the Thundat group at the University of Alberta, a rapid method to detect trace amounts of surface adsorbed explosive molecules is described. By developing a cantilevered nanowell structure and analysing common mode and individual modes through resonant photoacoustic excitation, the IR spectrum as well as the mass of the adsorbed chemical could be determined. See the full article.

Staff

Dr Paul Wardill
(08) 8150 5279 (0419) 810 220 Email

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Jeshua Graham
(08) 8150 5254 (0488) 177 540 Email
Christian Gow
(07) 3345 9556 (0408) 617 243 Email
Andrew Masters
Manager
(0439) 819 095 Email

Coherent Scientific Pty. Ltd., Inc. in South Australia, Established in 1989, ABN 20 008 265 969

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