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Resolving phase information of the optical local density of state with scattering near-field probes

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.
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https://hal-utt.archives-ouvertes.fr/hal-02446207
Contributor : Daniel Gavrysiak <>
Submitted on : Monday, January 20, 2020 - 4:41:38 PM
Last modification on : Monday, June 8, 2020 - 2:10:02 PM

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Rohit Prasad, Rémi Vincent. Resolving phase information of the optical local density of state with scattering near-field probes. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2016, 94 (16), ⟨10.1103/PhysRevB.94.165440⟩. ⟨hal-02446207⟩

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