A method and system for changing a pressure within at least one enclosure in a MEMS device are disclosed. In a first aspect, the method comprises applying a laser through one of the at least two substrates onto a material which changes the pressure within at least one enclosure when exposed to the laser, wherein the at least one enclosure is formed by the at least two substrates. In a second aspect, the system comprises a MEMS device that includes a first substrate, a second substrate bonded to the first substrate, wherein at least one enclosure is located between the first and the second substrates, a metal layer within one of the first substrate and the second substrate, and a material vertically oriented over the metal layer, wherein when the material is heated the material changes a pressure within the at least one enclosure.