´╗┐Thursday, 25 May 2017
High-harmonic generation in graphene enhanced by elliptically polarized light excitation

Added: 18.05.2017 19:55 | 5 views | 0 comments


The electronic properties of graphene can give rise to a range of nonlinear optical responses. One of the most desirable nonlinear optical processes is high-harmonic generation (HHG) originating from coherent electron motion induced by an intense light field. Here, we report on the observation of up to ninth-order harmonics in graphene excited by mid-infrared laser pulses at room temperature. The HHG in graphene is enhanced by an elliptically polarized laser excitation, and the resultant harmonic radiation has a particular polarization. The observed ellipticity dependence is reproduced by a fully quantum mechanical treatment of HHG in solids. The zero-gap nature causes the unique properties of HHG in graphene, and our findings open up the possibility of investigating strong-field and ultrafast dynamics and nonlinear behavior of massless Dirac fermions.

More in science.sciencemag.org »



Image with code
CommentsComments:
advertising

Copyright © 2008 - 2017 freshdailynewsonline.com  - all rights reserved