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Apertureless near-field optical microscopy via local second-harmonic generation.
1School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7 1NN, UK. azayats@qub.ac.uk
Journal of Microscopy
|April 12, 2001
Summary
This study introduces an apertureless scanning near-field optical microscope (SNOM) utilizing second-harmonic generation. The technique enables high-resolution imaging of surface optical properties through localized light generation.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Scanning Near-field Optical Microscopy (SNOM) offers high spatial resolution.
- Second-harmonic generation (SHG) is a nonlinear optical process sensitive to material properties.
Purpose of the Study:
- To numerically study and experimentally realize an apertureless SNOM based on local SHG enhancement.
- To investigate the imaging mechanisms and capabilities of this novel SNOM technique.
Main Methods:
- Numerical simulations of electromagnetic interactions between a probe tip and a surface.
- Experimental implementation using a silver-coated fiber tip as the probe.
- Analysis of tip-surface interaction and excitation light polarization effects.
Main Results:
- Achieved strongly confined sources of second-harmonic light at the probe tip apex and/or surface.
- Demonstrated the influence of tip-surface interaction and light polarization on imaging.
- Successfully visualized localized electromagnetic excitations and lateral variations in optical properties.
Conclusions:
- The apertureless second-harmonic SNOM is a viable technique for nanoscale optical imaging.
- This method provides insights into localized electromagnetic phenomena and surface optical properties.
- The technique holds promise for advanced materials characterization and surface science.