Abstract
Non linear absorption of intense few cycle laser pulses in fullerenes is studied by treating it as a laser driven nonlinear oscillator, using a rigid shell model. Efficient collisionless absorption of intense (Intensity I < 1018W/cm2) ultrashort laser pulses in fullerene (C60) is estimated owing to its extraordinary anharmonicty which is quite different than the conventionally used solid gas clusters. Compared to gas clusters nonlinear resonance in C60 has unusual characteristics. Factors other than nonlinear resonance which contribute in energy absorption in C60 are outlined. Strong dephasing of electrons with the laser field both at onset and during the dynamical oscillations leads to the efficient energy gain by the electrons. It is found that fullerene has a distinct threshold intensity requirement depending on its charge for efficient absorption. These properties make fullerene unique for efficient absorption of high intensity few cycle laser pulses.
Highlights
Coupling of high intensity ultrashort laser pulse energy in matter for efficient x-ray,[1] electron and high energy ion generation is of great interest for various applications.[2]
It is found that the electron cloud oscillation dynamics of fullerene is quite distinct from the usual non linear oscillations in laser interacting with SC.[7,8,9,10]
Using the Gauss law the charge +Q of the spherical ion shell can be assumed to be located at point A which is the centre of ion shell provided one is seeing its effect outside the Gaussian surface. With these arguments the problem is simplified to finding the force experienced by electron shell outside the Gaussian surface (ECDF) due to + Q charge located at point A which is the ion shell centre
Summary
Cite as: AIP Advances 8, 125016 (2018); https://doi.org/10.1063/1.5042300 Submitted: 31 May 2018 • Accepted: 08 September 2018 • Published Online: 19 December 2018 ARTICLES YOU MAY BE INTERESTED IN Microstructure and magnetic properties of ultrathin FePt granular films AIP Advances 8, 125018 (2018); https://doi.org/10.1063/1.5022781 Evaporation-induced assembly of colloidal clusters into superclusters with nonconvex deltahedral geometry AIP Advances 8, 125116 (2018); https://doi.org/10.1063/1.5055638 Strong terahertz response in quantum well photodetector based on intradonor transition by magnetic field AIP Advances 8, 125014 (2018); https://doi.org/10.1063/1.5051203 U. Chakravarty1,2,a and Deepa Chaturvedi3 1Laser Plasma Section, Raja Ramanna Centre for Advanced Technology, Indore 452013, India 2Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India 3Indian Institute of Technology, Delhi 110016, India (Received 31 May 2018; accepted 8 September 2018; published online 19 December 2018)
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