A radio-interrogable data storage medium having a carrier in which electric components are embedded, and a component for optically signaling a previously assumed operating state. Also, a method for operating the radio-interrogable data storage medium, including the steps of the data storage medium assuming various operating states, and optically signaling at least one previously assumed operating state.

 
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< Circular grating resonator structure with integrated electro-optical modulation

> Laminated retardation optical element, process of producing the same, and liquid crystal display

~ 00494