The technology is a method for drawing extended lengths of fibers made of conducting, semiconducting, and insulated micro-elements in close contact and in a variety of geometries. The fibers are fabricated using low-melting temperature conductors with amorphous semiconductors and insulators into a preform which holds the final fiber geometry. The preform is subsequently drawn into a fiber which preserves the initial geometry while forming intimate interfaces and feature sizes down to below 100 nanometers. Two prototypical functional fiber structures are fibers for dual electron-photon transport and tunable narrow band fiber photodetectors. Both structures demonstrate excellent metal-semiconductor contact and the fibers retained desired electrical and optical properties. The fiber characteristics allow for the construction of optoelectronic functional fabrics by weaving fibers together. This allows for the illumination points to be localized with only order N (instead of N2) fibers. Large area optoelectronic functional surfaces are also enabled with the possibility of determining the direction of observed light.