Multilayer thin film devices that include a bioactive agent for elution to the surrounding tissue upon administration to a subject are provided. This has been found to produce a uniform vascular enhancement for the scanning of a patient’s blood vessels. Each intersection point contains a light emitter and a light receiver, and in a scanning period, the processor receives a signal as to a change in resistance at a particular intersection, enabling the processor to determine that a touch ahs been applied to a particular intersection point. The methods may be further advantageous in that they are relatively simple and may be applied to a wide range of organic NLO materials. The sintered material portion of the bar surface provides a region of increased friction for compressed air flow, thus more effectively guiding the withdrawn film in a flat and even form.