Carbon nanoparticles assisted energy transport mechanism in leaves: A thermal lens study M. S. Swapna, Vimal Raj, H. V. Saritha Devi, P. M. Radhamany and S. Sankararaman Eur. Phys. J. Plus, 134 8 (2019) 416 Published online: 30 August 2019 DOI: 10.1140/epjp/i2019-12780-1