Fig. 1. Schematic diagram of preparation process of multimaterial preforms. (a) Rod-in-tube method; (b) Extrusion method ; (c) Thin-film rolling method; (d) Stack and drawn method; (e) 3D printing method

Fig. 2. (a) Schematic diagram of thermal drawing of multimaterial fibers; (b) Multimaterial fiber end structures based on different combinations of materials and functions

Fig. 3. Dynamic viscosity of various materials versus temperature^[4]. (a) Viscosity for silica, silicon, and gold^[42-44]; (b) Viscosity for silica, soda-lime-silica glass, fluoride glass, tellurite glass, chalcogenide glass, polymer, and amorphous selenium^[45-51]; (c) The viscosity for silicon, germanium, indium antimonide, tellurium, indium arsenide, indium, tin, and gold^[52-54]; (d) Linear thermal expansion coefficient at room temperature for various materials plotted against the melting temperature (T_m) for metals and semiconductors and the glass transition temperature (T_g) for the amorphous materials^[55-58]

Fig. 4. The applications of multimaterial optoelectronic fibers. (a) Optical detection; (b) Chemical detection; (c) Acoustic detection; (d) Radiation detection; (e) Deformation detection; (f) Physiological monitoring; (g) Neural modulation