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- 저자 : Ciappina, M. F. (검색결과 1 건)
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Active tailoring of nanoantenna plasmonic fields using few-cycle laser pulses
Choi, S.,Ciappina, M. F.,Pé,rez-Herná,ndez, J. A.,Landsman, A. S.,Kim, Y.-J.,Kim, S. C.,Kim, D. American Physical Society 2016 Physical Review A Vol.93 No.2
<P>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.</P>
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