The thin-film deposition and photodecomposition of cesium azide are demonstrated and used to fill arrays of miniaturized atomic resonance cells with cesium and nitrogen buffer gas for chip-scale atomic-based instruments. Arrays of silicon cells are batch fabricated on a wafer into which cesium azide is deposited by vacuum thermal evaporation. After vacuum sealing, the cells are then irradiated with ultraviolet radiation, causing the azide is photodissociate into pure cesium and nitrogen in-situ. This technology integrates the vapor-cell fabrication and filling procedures into one continuous and wafer-level parallel process, and results in cells that are optically transparent and chemically pure.
Applied Physics Letters
atomic clock, azide, cesium, microfabrication, vapor cell