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8 Aug 2005

Volume 87, Issue 6, Articles (06xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 87, 061103 (2005); http://dx.doi.org/10.1063/1.2008357 (3 pages)

Y. C. Zhong, S. A. Zhu, H. M. Su, H. Z. Wang, J. M. Chen, Z. H. Zeng, and Y. L. Chen
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Femtosecond laser pulses distinguish bacteria from background urban aerosols

François Courvoisier, Véronique Boutou, Vanessa Wood, Andreas Bartelt, Matthias Roth, Herschel Rabitz, and Jean-Pierre Wolf

Appl. Phys. Lett. 87, 063901 (2005); http://dx.doi.org/10.1063/1.2007870 (3 pages) | Cited 9 times

Online Publication Date: 1 August 2005

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The fluorescence from living bacteria (Bacillus subtilis, Enteroccocus and Escherichia coli), induced by a ultrashort 270 nm pump pulse is depleted up to 50% by an optically delayed ultrafast 810 nm probe pulse in a pump-probe arrangement. The fast (subpicosecond) fluorescence decrease occurs for a pump-probe delay of Δt>2 ps. Depletion is also observed for tryptophan in water in contrast with organic cyclic molecules such as naphtalene or diesel fuel, despite similar absorption and fluorescence spectra. This remarkable difference allows us to propose a new remote sensing method able to efficiently discriminate organic from biological aerosols in highly populated urban areas.
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87.64.K- Spectroscopy
82.70.Rr Aerosols and foams
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy
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