Techniques to avoid interference with a frequency hopping signal that are of a periodic or quasi-periodic nature that may operate in the same frequency band and proximity with other devices. The anti-reflective layer is produced by annealing layers of titanium and aluminum on a waferdevice to provide a roughened surface that significantly reduces reflectivity to improve the accuracy and definition provided by optical lithography processes. The method also comprises wirelessly transmitting a message from a station associated with the issuer to the mobile device to initiate diagnostics of at least the secure element of the mobile device, the message comprising the access key, wherein the diagnostics are performed by diagnostic instructions stored on the mobile device. Derived from the created reproduced light a distance control signal representative of a distance between the microscopic aperture 12 and the recording medium 10. Further the subject matter includes methods and kits for conducting a reaction with enhanced throughput and methods of conducting miniaturized, high throughput analyses of reaction products, and the like. An emergency unlocking actuation can also be integrated in a simple manner.