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(Color online) Sketch of the polarization modulated SNOM setup. Near field signal and lock-in polarization properties maps are collected simultaneously.
(Color online) Bulk luminescence emission spectrum of our diamond sample under illumination. In the inset is shown a SEM image of its surface. The thickness of the diamond is about and its roughness is about .
(Color online) Simultaneous scans of near field photoluminescence and its polarization properties. (a) Near field PL intensity map of a region. The image is not treated and oscillation due to the chopping procedure is visible. (b) Lock-in phase signal revealing pixel-to-pixel correspondence to the polarization-changing properties of the emission. (c) Map of the phase differences in (b) emphasizing the confined domains where stronger phase variation occurs. (d) Cross section along and lines. The left vertical axis corresponds to the observed signal in counts, the right one is the corresponding polarization phase shift.
(Color online) Another example of polarization-changing features within the CVD crystal structure. (a) Optical near field map. (b) Polarization modulated map. (c) Map of the phase difference emphasizing the region of higher polarization variation. (d) Cross section profiles along the lines and .
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