Fig. 2: PNJ head design optimization. | Communications Physics

Fig. 2: PNJ head design optimization.

From: On-fiber photonic nanojet enables super-resolution in en face optical coherence tomography and scattering nanoscopy

Fig. 2

a COMSOL simulation of the optics from nanoprobe inside the optical fiber tip cavity. b Experimentally obtained beam profile from a nanoprobe in a longitudinal plane through the beam axis, the linescan along the central axis(horizontal red line) indicates variation in intensity with propagation, the inset is the transverse beam profile taken across the vertical red dashed line. It shares the same scale of figure (b) itself. c Represents an intensity comparison of the simulation results between the nanoprobe beam and PNJ, longitudinally along the optical axis. The blue circle shows the position and outline of microsphere. d COMSOL simulation of the PNJ from the microsphere placed at the opening of the cavity in front of the nanoprobe. Both the figure (c, d) are concatenated and shares the same X axis. This helps to understand how the field varies relative to the position of nanoprobe and microsphere.

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