منابع مشابه
Phase imaging and detection in pseudo-heterodyne scattering scanning near-field optical microscopy measurements.
When considering the pseudo-heterodyne mode for detection of the modulus and phase of the near field from scattering scanning near-field optical microscopy (s-SNOM) measurements, processing only the modulus of the signal may produce an undesired constraint in the accessible values of the phase of the near field. A two-dimensional analysis of the signal provided by the data acquisition system ma...
متن کاملHeterodyne near-field scanning optical microscopy with spectrally broad sources.
We propose to use low-coherence-length cw optical sources with a broad spectrum in heterodyne near-field scanning microscopy in order to imitate optical pulse propagation and to obtain information about spectrally variant properties of nanophotonic components. The dispersion difference in the interferometer arms for a symmetric acousto-optic modulator arrangement is shown to be negligible over ...
متن کاملInverse Scattering in Near-field Optics
A regularized continuation method is developed for a two-dimensional inverse medium scattering problem in near-field optics, which reconstructs the scatterer of an inhomogeneous medium deposited on a homogeneous substrate from data accessible through photon scanning tunneling microscopy (PSTM) experiments. In addition to the ill-posedness of inverse scattering problems, two difficulties arise b...
متن کاملNear-field scattering of longitudinal fields
Longitudinal fields created in strongly focused laser beams are investigated by near-field optical microscopy. Sharp metallic and dielectric tips are raster scanned through the focus of these modes. It is found that regardless of the tip material, the signal scattered by the tip is a measure for the strength of the local longitudinal field. A surprising contrast reversal is observed between the...
متن کاملSpatial coherence in near-field Raman scattering.
Inelastic light scattering in crystals has historically been treated as a spatially incoherent process, giving rise to incoherent optical radiation. Here we demonstrate that Raman scattering can be spatially coherent, in which case it depends on the dimensionality and symmetry of the scatterer. Using near-field spectroscopy, we measure a correlation length of ∼30 nm for the optical phonons in ...
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ژورنال
عنوان ژورنال: Applied Physics Letters
سال: 2008
ISSN: 0003-6951,1077-3118
DOI: 10.1063/1.2937841