Self-aligning spatial filter

Tariq M. Haniff; Albert K. Hu; Evan D. Green

doi:10.1117/12.179596

13 July 1994 Self-aligning spatial filter

Tariq M. Haniff, Albert K. Hu, Evan D. Green

Proceedings Volume 2220, Sensing, Imaging, and Vision for Control and Guidance of Aerospace Vehicles; (1994) https://doi.org/10.1117/12.179596
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

In this paper we describe a prototype self-aligning spatial filter (SASF). We present studies of the design and the results of fabrication prior to the final processing step. The SASF consists of an electrostatically actuated platform on which an optical spatial filter (pinhole) has been fabricated. The pinhole is in the center of a four quadrant split-cell photodetector, which serves as the alignment gauge for the system. When a focused beam at the pinhole is aligned, all four detectors sense the same optical current. In future devices, this information from the photodetectors will be fed back to the electrostatic actuation system to push the platform and align the beam. The electrostatic actuators are formed from the parallel walls of vertical side- wall capacitors built between the silicon bulk and the movable platform. Electrical signal paths in the integrated system used diffused interconnects, while the photodetectors are simply reverse-biased p⁺n diodes. Fabrication techniques are similar to surface micromachining, except that a wafer bonding step is used to create single crystal structures.

Citation Download Citation

Tariq M. Haniff, Albert K. Hu, and Evan D. Green "Self-aligning spatial filter", Proc. SPIE 2220, Sensing, Imaging, and Vision for Control and Guidance of Aerospace Vehicles, (13 July 1994); https://doi.org/10.1117/12.179596

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