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Modulation transfer function measurements of microjetted microlenses.

B T Teipen1, D L MacFarlane

  • 1Erik Jonsson School of Engineering and Computer Science, the University of Texas at Dallas, Richardson, Texas 75083, USA.

Applied Optics
|March 6, 2008
PubMed
Summary

Microjetted microlenses were tested for performance. Larger lenses showed significantly reduced performance due to increased spherical aberration, highlighting a key limitation in microlens design.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Microlenses are crucial optical components in various imaging systems.
  • Understanding the performance limitations of microjetted microlenses is essential for optimizing their use.

Purpose of the Study:

  • To measure the modulation transfer function (MTF) of microjetted microlenses.
  • To investigate the relationship between microlens size and optical performance, specifically cutoff frequency.
  • To analyze the impact of spherical aberration on microlens performance.

Main Methods:

  • Fabrication of microjetted microlenses with varying diameters (109–400 microm) and focal lengths (135–540 microm).
  • Measurement of the modulation transfer function (MTF) for each microlens.
  • Comparison of measured cutoff frequencies with theoretical values.

Main Results:

  • Single-drop microlenses (109 microm diameter) achieved performance near the theoretical cutoff frequency.
  • Larger microlenses (multiple droplets) exhibited a cutoff frequency approximately 35% of the theoretical value.
  • A significant increase in spherical aberration was observed with increasing microlens diameter.

Conclusions:

  • Microlens performance is strongly dependent on diameter.
  • Spherical aberration significantly degrades the optical quality of larger microjetted microlenses.
  • Design considerations for microjetted microlenses must account for the detrimental effects of spherical aberration at larger scales.