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Related Experiment Videos

Highly efficient second-harmonic nanosource for near-field optics and microscopy.

M Labardi1, M Allegrini, M Zavelani-Rossi

  • 1Istituto Nazionale per la Fisica della Materia, Dipartimento di Fisica, Università di Pisa, Via Buonarroti 2, 56127 Pisa, Italy. labardi@df.unipi.it

Optics Letters
|January 15, 2004
PubMed
Summary

Researchers created a highly efficient nanometric source of second-harmonic (SH) light using a metal tip and ultrafast lasers. This SH light generation is localized at the tip

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Area of Science:

  • Nonlinear optics
  • Nanophotonics
  • Surface plasmonics

Background:

  • Atomic Force Microscopy (AFM) tips are typically used for surface imaging.
  • Second-harmonic (SH) light generation is a nonlinear optical process where two photons of the same frequency combine to generate one photon of double the frequency.
  • Efficient nanoscale light sources are crucial for advanced optical applications.

Purpose of the Study:

  • To demonstrate a novel, highly efficient nanometric source of second-harmonic (SH) light.
  • To investigate the localization and characteristics of SH generation from a metal tip.

Main Methods:

  • Utilizing a metal tip, conventionally used for AFM, as a nanolocalized SH generator.
  • Employing grazing-incidence illumination with 25-fs laser pulses from a high-energy Ti:sapphire oscillator.

Related Experiment Videos

  • Scanning the tip around the laser focus to map SH generation.

    • Main Results:

    • Achieved unprecedented efficiency for a nanometric SH light source.
    • Demonstrated strong localization of SH generation precisely at the metal tip's apex.
    • Observed polarization dependence consistent with an on-axis nonlinear oscillating dipole model.

    Conclusions:

    • A metal AFM tip can serve as an efficient nanoscale source of SH light.
    • The SH generation mechanism is confirmed to be localized at the tip apex.
    • This technique offers a new pathway for developing advanced nanoscale optical sources.