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The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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All semiconductor enhanced high-harmonic generation from a single nanostructured cone.

Dominik Franz1, Shatha Kaassamani1, David Gauthier1

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Researchers developed the first nanoscale high harmonic source using a semiconductor waveguide. This compact nanodevice shows robust harmonic emission for advanced applications like petahertz electronics and nano-imaging.

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Area of Science:

  • Non-linear optics
  • Nanophotonics
  • Solid-state physics

Background:

  • High-harmonic generation (HHG) in solids is crucial for next-generation petahertz optoelectronics and compact extreme ultraviolet (EUV) sources.
  • Controlling non-linear phenomena at the nanoscale is key for scientific and industrial applications.

Purpose of the Study:

  • To realize the first nanoscale high harmonic source.
  • To investigate the competition between coherent harmonic enhancement and incoherent fluorescence in semiconductor nanostructures.

Main Methods:

  • Confining femtosecond laser electric fields within a single 3D semiconductor waveguide to reach the strong field regime.
  • Utilizing few nanojoules of laser energy for efficient harmonic generation.

Main Results:

  • Demonstrated the first functional nanoscale high harmonic source.
  • Observed a competition between coherent harmonic enhancement and excitonic fluorescence.
  • Reported clear enhancement of harmonic emission far from the band edge with robust sustainability.

Conclusions:

  • The developed nanoscale high harmonic source is a compact and sustainable nanodevice.
  • Potential applications include petahertz electronics, coherent diffractive imaging, nano-tomography, and nano-medicine.
  • Further research can advance ultra-compact UV/X-ray nanoprobes.