The present invention is directed to a method of producing nano- and microcapsules from spider silk proteins The invention is further directed to nano- or microcapsules obtainable by this method as well as pharmaceutical, cosmetical and food compositions containing same. An optical waveguide section W1 including groove portions 4a for the positioning of a substrate section, and a substrate section E1 including fitting plate portions 5a for fitting engagement with the groove portions 4a are individually produced. During a read operation, the buffer can receive a first portion of a misaligned data word from the first memory section and read a second portion of the misaligned data word from the second memory section and assemble the data in the data word from the first and second portions. The front light further includes a point light source arranged at an end, in the longitudinal direction, of the second optical guide plate, and a reflective film covering the surfaces of the grooves.