Near-field second-harmonic generation at a metal tip apex
- 13 May 2002
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 80 (19) , 3479-3481
- https://doi.org/10.1063/1.1478780
Abstract
Second-harmonic generation at a gold tip apex has been studied within the context of applications in apertureless scanning near-field microscopy. Polarization and distance dependencies of second-harmonic generation have been investigated and compared to respective dependencies for scattered fundamental light. The results shows that, in general, different topological features of a tip are responsible for scattering and second-harmonic generation in the far and near field. The near-field interaction between a probe tip and a surface significantly modifies enhancement of the electromagnetic field at the tip and results in different distance dependencies of near-field scattering and second-harmonic generation. The polarization contrast obtained with the second-harmonic signal significantly exceeds the polarization contrast of linear scattering from the tip.Keywords
This publication has 18 references indexed in Scilit:
- Complex Optical Constants on a Subwavelength ScalePhysical Review Letters, 2000
- Second-harmonic generation from individual surface defects under local excitationPhysical Review B, 2000
- Near-Field Fluorescence Microscopy Based on Two-Photon Excitation with Metal TipsPhysical Review Letters, 1999
- Electromagnetic field enhancement in the context of apertureless near-field microscopyOptics Communications, 1999
- Feasibility of molecular-resolution fluorescence near-field microscopy using multi-photon absorption and field enhancement near a sharp tipJournal of Applied Physics, 1999
- Material contrast in scanning near-field optical microscopy at 1–10 nm resolutionPhysical Review B, 1997
- Plasmon resonances and near-field optical microscopy: a self-consistent theoretical modelApplied Optics, 1992
- Superresolution optical imaging with a high-brightness subwavelength light sourceUltramicroscopy, 1992
- Near-field optical imaging with a non-evanescently excited high-brightness light source of sub-wavelength dimensionsNature, 1991
- Observation of Single-Particle Plasmons by Near-Field Optical MicroscopyPhysical Review Letters, 1989