Micro Fresnel Mirror Array with Individual Mirror Control
Binal Poyyathuruthy Bruno, Robert Sch\"utze, Ruediger Grunwald, Ulrike, Wallrabe
TL;DR
This paper introduces a miniaturized, individually controllable Fresnel mirror array with piezoelectric actuation, capable of generating stable interference patterns and optimized for high-speed operation.
Contribution
It presents the design, fabrication, and optimization of a high-speed, individually controllable Fresnel mirror array using piezobimorph actuators and FEM simulations.
Findings
Achieves maximum mirror deflections of 15 mrad
Operates at a resonance frequency of 28 kHz
Enables generation of propagation invariant interference patterns
Abstract
We present the design and fabrication of a miniaturized array of piezoelectrically actuated high speed Fresnel mirrors with individual mirror control. These Fresnel mirrors can be used to generate propagation invariant and self-healing interference patterns. The mirrors are actuated using piezobimorph actuators, and the consequent change of the tilting angle of the mirrors changes the fringe spacing of the interference pattern generated. The array consists of four Fresnel mirrors each having an area of 2x2 mm2 arranged in a 2x2 configuration. The device, optimized using FEM simulations, is able to achieve maximum mirror deflections of 15 mrad, and has a resonance frequency of 28 kHz.
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