An optical microelectromechanical (MEMS) device includes a conductive layer, a dielectric layer, a reflective layer and a plurality of supporters between the dielectric layer and reflective layer. The supporters are tapers, or inversed tapers, having an acute angle, wherein a side surface of one of the supporters and the surface of the dielectric layer form the acute angle. Each supporter comprises a horizontal extending portion connecting to the reflective layer, such that the reflective layer is suspended from the dielectric layer by a predetermined gap.