Generating femtosecond second-harmonic pulses from ultrathin Archimedean nanospirals

04/08/2014 - 3:30pm to 4:30pm
Speaker(s) / Presenter(s): 
Richard Haglund (Vanderbilt University)
Type of Event (for grouping events):
The explosive growth in the development of plasmonic devices for sensors, switches, catalysis 
and optical data links is driving the evolution of increasingly sophisticated nanostructures for 
these applications. Arrays of ultrathin Archimedean nanospirals exhibit linear and nonlinear 
optical properties associated with near-field plasmon resonances within the nanostructures. The 
enhanced electric fields at these resonances enable efficient second-harmonic generation (SHG)
because individual nanospirals have no symmetry axis. We observe efficient SHG from arrays 
of lithographically fabricated, sub-wavelength-dimension nanospirals, initiated by transform-
limited 15 fs pulses at a wavelength of 800 nm. The nanospiral arrays respond selectively to 
incident linear and circular polarization states and exhibit conversion among polarization states. 
I will conclude by suggesting some ways in which the asymmetry and two-dimensional chirality 
of the nanospirals may lead to interesting applications in metamaterial devices.
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