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Focusing of Light in the Eye01:16

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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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Evaluation and Optimization of a MOEMS Active Focusing Device.

Ulrich Mescheder1,2, Michael Lootze1, Khaled Aljasem3

  • 1Department of Mechanical & Medical Engineering, Institute for Microsystems Technology (IMST), Furtwangen University, Robert-Gerwig-Platz 1, 78120 Furtwangen, Germany.

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|February 12, 2021
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Summary

This study evaluates a micro-opto-electromechanical system (MOEMS) with a silicon membrane for active focusing. The device demonstrates suitability for high-performance imaging with a large aperture, achieving wavefront errors between λ/5-λ/10.

Keywords:
FEMMOEMSSOIactive focusingadaptive opticselectrostatic actuationthin film stress

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Area of Science:

  • Optoelectromechanical Systems
  • MEMS Technology
  • Optical Engineering

Background:

  • Micro-opto-electromechanical systems (MOEMS) offer potential for advanced optical functionalities.
  • Active focusing mechanisms are crucial for high-performance imaging systems.
  • Silicon membrane technology presents a promising platform for miniaturized optical devices.

Purpose of the Study:

  • To conduct a detailed evaluation of a novel MOEMS device for active focusing.
  • To investigate the impact of internal stress and process variations on device performance.
  • To characterize the practical properties of the membrane focusing device for imaging applications.

Main Methods:

  • Finite element method (FEM) simulations for theoretical analysis.
  • Experimental characterization of the electrostatically deformed silicon membrane.
  • Evaluation of device performance under varying process conditions and material stresses.

Main Results:

  • The MOEMS device, realized in silicon-on-insulator (SOI) technology, exhibits controllable focal length.
  • Internal stress, particularly from the buried oxide (BOX) layer, and stress gradients significantly influence device behavior.
  • The device achieves high-performance imaging with wavefront errors between λ/5-λ/10 for a 5 mm aperture.

Conclusions:

  • The proposed silicon membrane MOEMS is suitable for high-performance imaging applications.
  • Understanding and mitigating stress effects are critical for optimizing device performance.
  • The device demonstrates excellent long-term stability, controlled focal length, and dynamic response.