Fig. 2: Schematic overviews of the nanostructure-enhanced selective angle incoupling concept using single-mode MCF. | Nature Communications

Fig. 2: Schematic overviews of the nanostructure-enhanced selective angle incoupling concept using single-mode MCF.

From: Fiber-based angular demultiplexer using nanoprinted periodic structures on single-mode multicore fibers

Fig. 2

a Top view of the nanostructure enhanced MCF (dark blue: doped silica cores, light blue: silica glass, cyan: polymer). b Microscopic image of the surface of the bare MCF used here (ΛMCF = 36 μm, dc = 6.1 μm). The semitransparent area including the dashed lines marks the triangular arrangement of the cores inside the MCF. c Definition of the main parameters of a single periodic structure (cyan: polymer, dark blue: core). The yellow dashed circle refers to the center of the first ring. d Schematic representation (side view) of light coupling into one core including the periodic structure (red: incident beam, green: 0th order diffracted beam, yellow: -1st order diffracted beam). The magenta line shows the intensity profile of the fundamental mode.

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