Direct observation of a pure focused evanescent field of a high numerical aperture objective lens by scanning near-field optical microscopy
- 22 March 2005
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 86 (13)
- https://doi.org/10.1063/1.1886250
Abstract
Intensity distributions of a tightly focused evanescent field generated by a center blocked high numerical aperture (1.65) objective lens are investigated by a scanning near-field optical microscope. The pure focused evanescent field is mapped and a splitting phenomenon of the focal spot along the direction of polarization, caused by depolarization, is observed not only on the interface, where the evanescent field is generated, but also in the parallel planes away from the interface. The decaying nature of the focused evanescent field shows good agreement with the theoretical predication, indicating that the field is purely evanescent and does not contain a significant contribution from the propagating component. It is found in our experiment that the light coupling efficiencies of the longitudinal polarization component Ez and the transverse polarization component Ex to the fiber probe differ by a factor of 3Keywords
This publication has 21 references indexed in Scilit:
- Near-Field Second-Harmonic Generation Induced by Local Field EnhancementPhysical Review Letters, 2003
- The focus of light--linear polarization breaks the rotational symmetry of the focal spotJournal of Modern Optics, 2003
- Electric field depolarization in high aperture focusing with emphasis on annular aperturesJournal of Microscopy, 2000
- Depolarization by high aperture focusingApplied Physics Letters, 2000
- Simultaneous Imaging of Individual Molecules Aligned Both Parallel and Perpendicular to the Optic AxisPhysical Review Letters, 1998
- Single Molecule Imaging of Fluorophores and Enzymatic Reactions Achieved by Objective-Type Total Internal Reflection Fluorescence MicroscopyBiochemical and Biophysical Research Communications, 1997
- Single Molecule Dynamics Studied by Polarization ModulationPhysical Review Letters, 1996
- Imaging and Time-Resolved Spectroscopy of Single Molecules at an InterfaceScience, 1996
- Electromagnetic diffraction of light focused through a planar interface between materials of mismatched refractive indices: an integral representationJournal of the Optical Society of America A, 1995
- Electromagnetic diffraction in optical systems, II. Structure of the image field in an aplanatic systemProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1959