Authors
Rohit PRASAD, Rémi VINCENT,
Title
Resolving phase information of the optical local density of state with scattering near-field probes
In
PHYSICAL REVIEW B
Volume
94
Issue
16
Pages
165440
Publisher
American Physical Society
Year
2016
Publisher's URL
http://link.aps.org/doi/10.1103/PhysRevB.94.165440
Indexed by
Abstract
We theoretically discuss the link between the phase measured using a scattering optical scanning near-field microscopy (s-SNOM) and the local density of optical states (LDOS). A remarkable result is that the LDOS information is directly included in the phase of the probe. Therefore by monitoring the spatial variation of the trans-scattering phase, we locally measure the phase modulation associated with the probe and the optical paths. We demonstrate numerically that a technique involving two-phase imaging of a sample with two different sized tips should allow to obtain the image the pLDOS. For this imaging method, numerical comparison with extinction probe measurement shows crucial qualitative and quantitative improvement.
Affiliations
Offprint