Enhanced X-ray emission from nano-particle doped bacteria

Krishnamurthy, M. ; Kundu, M. ; Bane, Kartik ; Lad, Amit D. ; Singh, Prashant Kumar ; Chatterjee, Gourab ; Ravindra Kumar, G. ; Ray, Krishanu (2015) Enhanced X-ray emission from nano-particle doped bacteria Optics Express, 23 (14). pp. 17909-17922. ISSN 1094-4087

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Official URL: https://www.osapublishing.org/oe/abstract.cfm?uri=...

Related URL: http://dx.doi.org/10.1364/OE.23.017909


Recently, it has been greatly appreciated that intense light matter interaction is modified due to the nano- and microstructures in the target by – surface plasmons, laser energy localization scattering etc. Extreme laser intensities produce dense plasmas and collective mechanisms generate energetic electrons, ions and hard X-rays. Recently, it is postulated that the anharmonic electron motion, driven by ultrashort, high-intensity laser pulses, provides a universal mechanism for the laser absorption. Here, we provide the first demonstration of anharmonic-resonance-aided high laser-absorption in a biological system. At intensities of ∼1016–18 W/cm2, 40 fs pulses excite a plasma formed with E. coli bacteria. The density-inhomogeneities due to the micro- and nanostructures in the bacterial target increase Anharmonic Resonance (AHR) heating and result in a 104-fold enhancement in the hard X-ray yield compared to plain solid targets. These observations lead to novel high-energy X-ray sources that have implications to lithography, imaging and medical applications.

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ID Code:102722
Deposited On:02 Feb 2018 04:37
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