Science Daily October 18, 2022 An international team of researchers (Germany, USA – UC Irvine) used electric-field-resolved spectroscopy and quantum-chemical modelling to precisely measure and describe the complete coherent energy transfer between octave-spanning mid-infrared waveforms and vibrating molecules in aqueous solution. The sub-optical-cycle temporal resolution of their technique revealed alternating absorption and (stimulated) emission on a few-femtosecond time scale. This behaviour can only be captured when effects beyond the rotating wave approximation are considered. At a femtosecond-to-picosecond timescale, optical-phase-dependent coherent transients, and the dephasing of the vibrations of resonantly excited methylsulfonylmethane (DMSO2) were observed. Ab initio modelling using density functional […]
Tag Archives: Energy transfer
Scientists demonstrate perfect light absorption by single nanoparticle
Nanowerk June 15, 2021 Previously researchers succeeded in demonstrating the phenomenon of perfect absorption in large bodies of matter that were several times the size of a light beam. But the question remained unsolved was – whether the same was possible for miniature objects. An international team of researchers (Russia, Sweden) calculated the properties of a small object that could completely absorb all incidental light. They succeeded in reducing this complex analytical task to a simpler one – a Fredholm integral equation of the second kind. Having solved it, they found the ideal combination of particle and light properties that […]