Translator Disclaimer
24 September 2018 Trial functions for reduced-order models of piezoelectrically actuated microelectromechanical systems tunable lenses
Author Affiliations +
Abstract
Piezoelectrically actuated microelectromechanical systems (MEMS) lens structures can be composed of a clamped square elastic diaphragm partially covered with a thin piezoelectric film leaving a circular transparent region to form a lens pupil. To model these lenses’ linear static optoelectromechanical performance, the displacement can be approximated by a linear combination of basis functions, e.g., weighted Gegenbauer polynomials that satisfy clamped boundary conditions along the diaphragm edges. However, such a model needs as much as 120 degrees of freedom (DOFs) to provide a good approximation of the lens optical performance. To improve on this, we here consider approximating the deflection by an expansion using piecewise smooth functions that have different forms in the pupil and the actuator regions. We use exact solutions for the elastic plate differential equation over circular and annular subdomains, and weighted Gegenbauer polynomials in the remaining region. The latter enforces the boundary conditions. We have found that the larger the diaphragm area with exact plate solutions is, the lower is the number of DOFs needed to predict mechanical and optical quantities accurately. For example, a model with 10 DOFs achieves accuracies of 5.1% and 2.1% for RMS wavefront error and reciprocal F-number, respectively, for all pupil openings of interest.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2018/$25.00 © 2018 SPIE
Mahmoud A. Farghaly, Ulrik Hanke, Muhammad Nadeem Akram, and Einar Halvorsen "Trial functions for reduced-order models of piezoelectrically actuated microelectromechanical systems tunable lenses," Optical Engineering 57(9), 095103 (24 September 2018). https://doi.org/10.1117/1.OE.57.9.095103
Received: 2 May 2018; Accepted: 14 August 2018; Published: 24 September 2018
JOURNAL ARTICLE
18 PAGES


SHARE
Advertisement
Advertisement
Back to Top