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Second-harmonic generation in a near-field optical-fiber probe
Optics Letters
|December 1, 2007
Summary
Second-harmonic generation (SHG) was observed in a near-field optical-fiber probe. This SHG effect occurred at the aluminum coating, showing efficiency comparable to KDP crystals.
Area of Science:
- Nonlinear optics
- Optical microscopy
- Nanophotonics
Background:
- Second-harmonic generation (SHG) is a key nonlinear optical process.
- Near-field optical probes enable sub-wavelength resolution imaging.
- Efficient SHG sources are crucial for various photonic applications.
Purpose of the Study:
- To investigate SHG in a novel near-field optical-fiber probe.
- To characterize the SHG conversion efficiency of the probe.
- To determine the location of SHG within the probe structure.
Main Methods:
- Fabrication of a triple-tapered fiber probe with an aluminum coating.
- Measurement of SHG signal from the optical-fiber probe.
- Probe-to-probe experiments to confirm SHG localization.
Main Results:
- Observation of SHG in the near-field optical-fiber probe.
- Achieved an SHG conversion factor of 2.0 x 10(-11) cm(2)/W for a 100 nm aperture probe.
- Demonstrated that SHG originates from the aluminum coating on the fiber probe tip.
Conclusions:
- The developed optical-fiber probe is an efficient source for SHG.
- The aluminum coating plays a crucial role in enabling SHG.
- This technology holds promise for advanced nanoscale optical applications.
