Process for producing silicon oxide containing thin films on a growth substrate by the ALCVD method. The invention also relates to a container and tubing with such a device. The method converts the polarization-multiplexed optical signal to a corresponding polarization-multiplexed electrical signal. Differential permeation was observed and quantified by comparing the response to rhodamine 560 and lactalbumin protein in a membrane formed with SPE-methylene bisacrylamide.