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. Author manuscript; available in PMC: 2019 Jan 30.
Published in final edited form as: Nat Photonics. 2018 Jul 30;12(9):540–547. doi: 10.1038/s41566-018-0224-2

Figure 3. Optical characterization of the nano-optic endoscope and conventional OCT catheters.

Figure 3

a, Measured intensity distribution of the nano-optic endoscope along the propagation direction in the yz-plane (coordinates shown in Figure 2a) at λ = 1250, 1310, and 1370 nm. b, Focal spot profiles of the nano-optic endoscope at corresponding wavelengths. c, Focal spot profiles of a graded-index (GRIN) OCT catheter, a ball lens OCT catheter, and the nano-optic endoscope at 1310 nm wavelength. The incorporation of the metalens as the focusing element enables tighter focus with negligible astigmatism.