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Optical fiber tip for field-enhanced second harmonic generation.

Sudipta Sarkar Pal1, Samir K Mondal, Phun Phun Bajpai

  • 1CSIR-Central Scientific Instruments Organisation, Sector 30C, Chandigarh 160030, India.

Optics Letters
|October 3, 2012
PubMed
Summary

We developed a novel optical fiber tip for enhanced second harmonic generation (SHG) microscopy. This tip enables efficient nonlinear optical measurements and can function as a plasmonic probe for advanced nanophotonics characterization.

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Area of Science:

  • Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Nonlinear optical phenomena like second harmonic generation (SHG) are crucial for advanced imaging.
  • Developing efficient and versatile probes for nanoscale characterization remains a key challenge.

Purpose of the Study:

  • To propose and characterize a simple optical fiber tip for field-enhanced second harmonic generation (SHG).
  • To demonstrate the tip's capability for nanophotonics characterization, including its use as a plasmonic probe.

Main Methods:

  • Fabrication of a specialized optical fiber tip.
  • Characterization of SHG nonlinear phenomena across a broad spectral range (630-830 nm).
  • Analysis of the generated second harmonic optical field and its interaction with the tip's surface.

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Main Results:

  • The fiber tip exhibits efficient field-enhanced SHG over a wide wavelength range.
  • The second harmonic field forms a nondiffracting bottle beam due to tip curvature.
  • The tip can induce surface plasmons, functioning as a plasmonic probe with reduced background.

Conclusions:

  • The proposed optical fiber tip is a simple yet effective tool for field-enhanced SHG.
  • The tip's ability to induce surface plasmons enhances its utility for nanophotonics applications.
  • Demonstrated application as a surface-enhanced Raman spectroscopy probe highlights its versatility.