Abstract:
A microelectromechanical (MEMS) apparatus has a base (206) and a flap (211) with a portion coupled to the base so that the flap may move out of the plane of the base between first and second position. The base may have a cavity (215) with largely vertical sidewalls that contact a portion of the flap when the flap is in the second position. Electrodes (216) may be placed on the vertical sidewalls and electrically isolated from the base to provide electrostatic clamping of the flap to the sidewall. An array of one or more of such structures may be used to form an optical switch. The apparatus may be made by a process involving etching one or more trenches in a backside of a base. The trench may be etched such that a crystal orientation of the base material defines an orientation of a sidewall.
Abstract:
Microelectromechanical systems (MEMS) elements, optical switches and fabrication methods are described. A MEMS element comprises a crystalline moveable element moveably attached to a substrate for motion substantially perpendicular to a plane of the substrate. The moveable element includes a perpendicular portion oriented substantially perpendicular to the substrate. In at least one position, a part of the perpendicular portion projects beyond a surface of the substrate. The perpendicular portion and substrate have substantially similar crystal structures. The perpendicular portion may be formed from the substrate. An array of such structures can implement an optical switch. MEMS elements may be fabricated by forming one or more trenches in a substrate to define a perpendicular portion; attaching a moveable element to a first surface of the substrate; and removing a portion of the substrate such that at least a part of the perpendicular portion projects beyond a second surface.
Abstract:
Microelectromechanical systems (MEMS) elements, optical switches and fabrication methods are described. A MEMS element (101) comprises a crystalline moveable element moveably attached to a substrate for motion substantially perpendicular to a plane of the substrate. The moveable element includes a perpendicular portion (104) oriented substantially perpendicular to the substrate. In at least one position, a part of the perpendicular portion projects beyond a surface of the substrate. The perpendicular portion and substrate have substantially similar crystal structures. The perpendicular portion may be formed from the substrate. An array of such structures can implement an optical switch. MEMS elements may be fabricated by forming one or more trenches in a substrate to define a perpendicular portion; attaching a moveable element to a first surface of the substrate; and removing a portion of the substrate such that at least a part of the perpendicular portion projects beyond a second surface.