Fig. 1
From: 3D cellular-resolution imaging in arteries using few-mode interferometry
a The concept of using a single-mode-multimode fibre system for depth-encoded reflectometry. The colour pattern corresponds to different propagation modes. SMF single-mode fibre, MMF multimode fibre, OSP optical signal processing unit. b 3D rendering of the intensity profile inside the multimode fibre showing the few-mode generation processes of an SMM fibre system. The lateral and axial dimensions are not drawn to scale. The SMF has a mode field diameter of 5 μm, and the MMF has a core diameter of 50 μm and a length of 1.2 mm. A system wavelength of 800 nm is assumed. c Simulations of the focused field intensity distribution in the image space. The length of the spacer is 1.6 mm, and the objective has a focal distance of approximately 0.5 mm. We assume a refractive index of 1.34 in the image space. The focused field intensity distribution is normalised by the peak intensity and displayed on the dB scale with a dynamic range of 16 dB.
