Inactivation of viruses by coherent excitations with a low power visible femtosecond laser.

Abstract:

BACKGROUND:Resonant microwave absorption has been proposed in the literature to excite the vibrational states of microorganisms in an attempt to destroy them. But it is extremely difficult to transfer microwave excitation energy to the vibrational energy of microorganisms due to severe absorption of water in this spectral range. We demonstrate for the first time that, by using a visible femtosecond laser, it is effective to inactivate viruses such as bacteriophage M13 through impulsive stimulated Raman scattering. RESULTS AND DISCUSSION:By using a very low power (as low as 0.5 nj/pulse) visible femtosecond laser having a wavelength of 425 nm and a pulse width of 100 fs, we show that M13 phages were inactivated when the laser power density was greater than or equal to 50 MW/cm2. The inactivation of M13 phages was determined by plaque counts and had been found to depend on the pulse width as well as power density of the excitation laser. CONCLUSION:Our experimental findings lay down the foundation for an innovative new strategy of using a very low power visible femtosecond laser to selectively inactivate viruses and other microorganisms while leaving sensitive materials unharmed by manipulating and controlling with the femtosecond laser system.

journal_name

Virol J

journal_title

Virology journal

authors

Tsen KT,Tsen SW,Chang CL,Hung CF,Wu TC,Kiang JG

doi

10.1186/1743-422X-4-50

subject

Has Abstract

pub_date

2007-06-05 00:00:00

pages

50

issn

1743-422X

pii

1743-422X-4-50

journal_volume

4

pub_type

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