7 research outputs found
Theory of femtosecond coherent anti-Stokes Raman backscattering enhanced by quantum coherence for standoff detection of bacterial spores
Backscattered signal of coherent anti-Stokes Raman spectroscopy can be an extremely useful tool for remote identification of airborne particles, provided the signal is sufficiently large. We formulate a semiclassical theory of nonlinear scattering to estimate the number of detectable photons from a bacterial spore at a distance. For the first time, the theory incorporates enhanced quantum coherence via femtosecond pulses and a nonlinear process into the classical scattering problem. Our result shows a large backscattered signal in the far field, using typical parameters of an anthrax spore with maximally prepared vibrational coherence. Using train pulses of 1 kHz of repetition rate each with energy of 10 mJ, we estimate that about 10(7) photons can be detected by a 1 m diameter detector placed 1 km away from the spore in the backward scattering direction. The result shows the feasibility of developing a real time remote detection of hazardous microparticles in the atmosphere, particularly biopathogenic spores
Radiative cooling of nanoparticles close to a surface
We study the radiative cooling of polar and metallic nanoparticles immersed
in a thermal bath close to a partially reflecting surface. The dynamics of
relaxation is investigated at different distances from the surface, i.e., in
the near-field and far-field zones. We demonstrate the existence of an
oscillating behavior for the thermal relaxation time with respect to the
separation distance from the surface, an analog of Friedel oscillations in
Fermi liquids