Active tailoring of nanoantenna plasmonic fields using few-cycle laser pulses

S. Choi, M. F. Ciappina, J. A. Pérez-Hernández, A. S. Landsman, Y. J. Kim, S. C. Kim, D. Kim

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Plasmonic nanoatennas are a versatile tool for coherently manipulating light on a nanoscale by confining electric fields of the driving laser into subwavelength volumes, thereby significantly enhancing electric near fields. It is normally assumed that the time-dependent spectral properties of these near fields are independent of the duration of the driving laser pulse. Here we show that when a few-cycle laser pulse shines on a bow-tie nanoantenna, its spectral properties are dramatically modified, as evidenced by a large shift of the center wavelength of the near field, relative to the driving laser. In addition, for certain geometries, a second color appears in the near field, creating conditions for generation of an isolated attosecond pulse at megahertz repetition rate. Our results open the door to frequency-tunable ultrafast sources at nanometer scale without tuning the frequency of the driving laser.

Original languageEnglish
Article number021405
JournalPhysical Review A
Volume93
Issue number2
DOIs
StatePublished - 24 Feb 2016
Externally publishedYes

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