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A sensor and method for page-based optical data storage. The sensor includes a partially-reflective mirror, a reflective mirror disposed substantially collinear with and spaced apart from the partially-reflective mirror, and an active layer disposed substantially collinear with and between the partially-reflective mirror and the reflective mirror. The partially-reflective mirror has a first and second side and transmits a portion of light incident on the first side. The reflective mirror reflects light incident on the reflective mirror toward the partially-reflective mirror. The active layer absorbs at least a portion of the light oscillating at the resonant frequency.

The present invention relates to a button-type secondary battery, comprising: a lower can that serves as a first electrode terminal; an upper can that is coupled to and surrounds the lower can and serves as a second electrode terminal; and a gasket that is provided between the lower can and the upper can, wherein indented lower insertion grooves and indented upper insertion grooves are respectively formed on surfaces of the lower can and the upper can, to which the gasket is adhered, and the lower insertion grooves and the upper insertion grooves are located spaced apart from each other so as not to face each other.