Fig. 1: Schematic of the experimental set up for capturing the beam profile in air from the Photonic nanojet (PNJ) head with the microsphere and the nanoprobe. | Communications Physics

Fig. 1: Schematic of the experimental set up for capturing the beam profile in air from the Photonic nanojet (PNJ) head with the microsphere and the nanoprobe.

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

Fig. 1

a The 660 nm laser source is coupled to a 50/50 coupler whose one output arm (orange branch) holds the nanoprobe while another (green branch with Nano translation) holds the PNJ head. The coupler assures the same power goes to both the arms while profiling the respective beam using custom made near field beam profiler consisting of an objective, tube assembly and CMOS camera. b shows a Field Emission Scanning Electron Microscopy (FESEM) image of the nanoprobe to demonstrate that how a microsphere is placed inside the cavity of the nanoprobe and (c) shows an optical microscopic image of PNJ head.

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