Fig. 4: En face OCT as a proof of the PNJ’s capability to image beyond the diffraction limit and to scan the sample as well. | Communications Physics

Fig. 4: En face OCT as a proof of the PNJ’s capability to image beyond the diffraction limit and to scan the sample as well.

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

Fig. 4

a An en face OCT image of DVD: (i) The DVD grating shows a resolution ~246 nm, ~0.3 times the wavelength used in the experiment, the dimension of scale bar is 500 nm. The concatenated graph (ii) shows a linescan of the OCT image at position marked by yellow line. b FESEM image of the said DVD with gold coating predicts a resolution ~246 nm confirming the OCT resolution. c 100× microscopic image of the DVD sample taken with 1.25 NA objective in oil, the dimension of scale bar is 500 nm. d A larger area En face OCT image of the DVD, yellow box highlights panel (a(i)), the scalebar is 1 μm. e 3D phase image of the DVD sample with a colorbar representing the optical thickness, ~70 nm.

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