High harmonic generation in semiconductor nanocones
HHG in solids was first reported in 2011 and requires intensities in the range 1011 – 1013 W/cm2. Nanostructures have the potential to enhance modest laser intensities as delivered by laser oscillators (109 – 1011 W/cm2) locally by several orders of magnitude which allows to trigger HHG. We study HHG in solids assisted by local field enhancement in nanostructures. We have developed and fabricated different types of metallic and semiconductor nanostructures that were demonstrated to increase harmonic pulse energies by several orders of magnitude. Semiconductors have several advantages with respect to metallic nanostructures. On the one hand, they exhibit a large enhancement volume. On the other hand, damage is significantly reduced.
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