Design and optimization of microlens array based high resolution beam steering system

Akatay, Ata; Ürey, Hakan

doi:10.1364/oe.15.004523

Cited by 47 publications

(14 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since Gabor proposed the use of an array of microscale lenses as a superlens to overcome the diffraction limit 1 , microlens arrays (MLAs) have been widely used in optical systems for imaging or non-imaging applications including charge-coupled device (CCD) cameras 2–4 , light-field (LF) imaging systems 5–8 or LF 3D displays 9–11 , sensors 12,13 , photolithography 14 , fibre couplers 15 , optical switches 16,17 , and light-emitting diodes (LEDs) or organic-LEDs (OLEDs) 18,19 . In particular, MLAs in LF imaging systems are used to capture optical information on directional ray distributions.…”

Section: Introductionmentioning

confidence: 99%

Fast-switching laterally virtual-moving microlens array for enhancing spatial resolution in light-field imaging system without degradation of angular sampling resolution

Park

Joo

et al. 2019

Sci Rep

View full text Add to dashboard Cite

We present an electrically controllable fast-switching virtual-moving microlens array (MLA) consisting of a stacked structure of two polarization-dependent microlens arrays (PDMLAs) with optical orthogonality, where the position of the two stacked PDMLAs is shifted by half the elemental pitch in the diagonal direction. By controlling the polarization of the incident light without the physical movement of the molecules comprising the virtual-moving MLA, the periodic sampling position of the MLA can be switched fast using a polarization-switching layer based on a fast-switching liquid crystal cell. Using the fast-switching virtual-moving MLA, the spatial-resolution-enhanced light-field (LF) imaging system was demonstrated without a decrease in the angular sampling resolution as compared to the conventional LF imaging system comprising a passive MLA; two sets of elemental image arrays were captured quickly owing to the short switching time of the virtual-moving MLA of 450 μs. From the two captured sets of the elemental array image, four-times resolution-enhanced reconstruction images of the directional-view and depth-slice images could be obtained.

show abstract

Section: Introductionmentioning

confidence: 99%

Fast-switching laterally virtual-moving microlens array for enhancing spatial resolution in light-field imaging system without degradation of angular sampling resolution

Park

Joo

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…However, when the incident angle is too large, it cannot be imaged on the second row of microlenses. As a result, it emits as a spurious spot around the target DMD surface and reduces the optical utilization of the microlens arrays [7,8], which is shown in Fig. 4.…”

Section: Large Incident Angle Analysismentioning

confidence: 99%

Illumination optics design for DMD Pico-projectors based on generalized functional method and microlens array

Zhang

Zhu³

2019

J. Eur. Opt. Soc.-Rapid Publ.

View full text Add to dashboard Cite

The influence of incident angle and aberration of the microlens array on the optical efficiency in pico-projector is analyzed. By modifying the relevant parameters, a method to optimize the optical efficiency and uniformity of the illumination system is proposed. By changing the profile of the freeform double lens used for the concentrator of LED source, the incident angle can be reduced, thus the efficiency loss caused by large angle incident can be reduced. In addition, two spherical relay lenses instead of the Fourier lenses are used as integral component after the microlens array, which is not only low cost, but also more flexible in controlling aberrations. After system optimization, the illumination efficiency and uniformity of the pico-projector system can reach 60.51% and 86.2%, which verifies the feasibility and validity of the theoretical analysis.

show abstract

“…Numerous methods have been developed to reach high steering angles within a small form factor. Our group showed that scanning micro-lens arrays (MLA) are good candidates for such requirements [1]. Where imaging is needed within a constrained volume, e.g.…”

Section: D Mems Stagesmentioning

confidence: 99%

MEMS scanners for display, imaging, and spectroscopy and their dynamic characterization

Ürey

Seren

2009

SPIE Proceedings

Self Cite

View full text Add to dashboard Cite

Moving micro-mechanical structures combined with laser light sources and micro-optics enable a number of powerful applications in display, imaging, and spectroscopy. Examples of systems developed in our laboratory are: rotational scanners developed for micro-projectors, dynamic diffraction gratings with large out-of-plane motion developed for Fourier Transform spectrometers, and 2 degree-of-freedom MEMS stages that carry micro-lens arrays for laser beam steering and imaging applications. Precise control of motion is critical in all those applications. We developed a number of optical characterization tools for point-based and fullfield dynamic characterization of micro and nano mechanical structures. In this paper, we first briefly discuss the applications and then describe the details of the optical characterization tools. First setup is a stroboscopic interferometry for dynamic deformation analysis. Second setup is a simple technique for simultaneous in-plane and out-of-plane measurement with nanometric precision. The setup is constructed using one photo detector and a Mirau-type interference objective. For out-of-plane measurements, interference fringes are used to compute the the deflection amount. For in-plane measurements, knife edge technique is used to modulate the reflected beam intensity using a sharp edge in the object. Third setup is a simple optical angle sensor for rotational mirrors, which uses only one bi-cell photo detector. The setup is able to measure amplitude, phase, and quality factor of torsional devices.

show abstract

Design and optimization of microlens array based high resolution beam steering system

Cited by 47 publications

References 6 publications

Fast-switching laterally virtual-moving microlens array for enhancing spatial resolution in light-field imaging system without degradation of angular sampling resolution

Fast-switching laterally virtual-moving microlens array for enhancing spatial resolution in light-field imaging system without degradation of angular sampling resolution

Illumination optics design for DMD Pico-projectors based on generalized functional method and microlens array

MEMS scanners for display, imaging, and spectroscopy and their dynamic characterization

Contact Info

Product

Resources

About