Experimentally measured time-structure of the electric field of an 11-fs optical pulse incident on a 800-nm period array of 50-nm wide slits in a thin gold film and on the transmitted output pulse.
Microscopic spatial structure of the surface plasmon polarition in the near-field of an 800-nm period nanoslit array in a thin gold film at a wavelength corresponding to (left) enhanced superradiant damping and (right) reduced subradiant damping of the plasmon field.
Researchers from Berlin and Seoul store light in plasmonic crystals
Light can creep through tiny holes in a metal plate, even if those holes are smaller in diameter than the wavelength of light. What’s more, the light is stored for a short period of time on the metal surface, as if the metal were a photonic crystal. The controlled interaction of light with such metal structures could pave the way to unique methods for nanosensing or nanoscale information transfer, write Claus Ropers and colleagues in the forthcoming issue of Physical Review Letters (“Femtosecond light transmission and subradiant damping in plasmonic crystals”).
In their experiments conducted at the Max Born Institute in Berlin, Ropers and colleagues aim an ultrashort laser pulse at a nanostructured metal surface. The initial laser pulse measures 10 femtoseconds (fs). 1 fs is the millionth part of a billionth second (0.000000000000001 second). As the light hits the surface, it drives electron oscillations and generates surface-bound electromagnetic waves, known as surface plasmon polaritons.
Josef Zens | alfa
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