We theoretically investigate the isolated attosecond pulse generation in a pre-excited medium by using local nanoplasmonic fields with few-cycle duration. It is shown that the combined effect of the temporal ionization of the pre-excited medium and the spatial inhomogeneity of the local nanoplasmonic field can dramatically control the quantum path, leading to broadband supercontinuous harmonics with high yield. Moreover, this spatiotemporal combination is robust against the carrier-envelope phase (CEP) shift, and the broadband supercontinuum can be supported by nearly all the CEPs of the local field. It would open a route to obtain efficient isolated attosecond emission with no need for the CEP-stabilized laser technique.
© 2013 Optical Society of America
Original Manuscript: May 23, 2013
Revised Manuscript: July 28, 2013
Manuscript Accepted: August 1, 2013
Published: August 26, 2013
Jianghua Luo, Yang Li, Zhe Wang, Qingbin Zhang, Pengfei Lan, and Peixiang Lu, "Efficient isolated attosecond emission in a pre-excited medium using noncarrier-envelope phase-stabilized nanoplasmonic fields," J. Opt. Soc. Am. B 30, 2469-2475 (2013)