Patent ID: 8913322
Filing Date: 2014-12-16
Classification: G01B,G01J,G02B,Y10T

Abstract:
1. An electrically tunable Fabry-Perot interferometer, comprising: a substrate, a first mirror on the substrate, a second, movable mirror, the second mirror has a movable optical area and a movable area surrounding the optical area, a Fabry-Perot cavity between the first and second mirrors, the first and second mirror have electrodes for electrical control of the distance between the mirrors, at least the surrounding area of the second mirror has a gap between two layers of the mirror, and mirror layers at the opposite sides of the gap are connected with anchoring through the gap, wherein, the electrodes of the first and second mirrors extend to the optical area, and the implementation of the anchoring is such that the stiffness of the surrounding area is lower than the stiffness of the optical area, whereby the movable mirror is arranged to bend more at the surrounding area than at the optical area on activation of the electrodes with a control voltage, the second, movable mirror includes a gap also at the optical area, and the density of anchors in the gap of the second, movable mirror is higher at the optical area than at the surrounding area.