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Proceedings Paper

Miniaturized fiber raster scanner for endoscopy
Author(s): David R. Rivera; Demirhan Kobat; Chris Xu
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Paper Abstract

A miniaturized scanning mechanism is a crucial component in the creation of endoscopes for microscopic imaging. Several groups have developed resonant scanners (e.g., spiral or Lissajous scan pattern), but these suffer from limitations in non-uniform spatial coverage and sampling time, in comparison to a raster scanner. Additionally, a resonant scanner lacks the ability to perform line-scan imaging, a crucial capability in measuring a variety of fast, dynamic physiological phenomena (e.g., blood flow, molecular diffusion, etc.). However, current miniaturized raster scanners are limited in terms of their physical dimensions and scan speed. We demonstrate a novel hybrid resonant/non-resonant miniaturized raster scanner, fabricated by mounting a double clad fiber onto two perpendicularly oriented piezo bimorphs. The fiber scanner has a total length of 2.6cm, a width/thickness [less than or equal to] 1mm, achieves [greater than or equal to] fiber tip deflection for both the resonant and non-resonant axes, and allows for imaging at approximately 4 frames per second (512 lines per frame). An essentially uniform spatial coverage and sampling time can be achieved by utilizing the middle portion (e.g., middle 500 μm) of the resonant scanning range. The small size allows for the fiber scanner to be easily packaged along with miniaturized lenses to form an endoscope for microscopic imaging. We bonded a stiffening fiber alongside the vibrating fiber to break its cylindrical symmetry. Thus, only one vibration mode is excited, generating a purely linear spatial motion. In order to demonstrate the fiber scanner's imaging capabilities we have taken transmission and fluorescence images, in which the double clad fiber's inner clad is used for fluorescence collection.

Paper Details

Date Published: 16 February 2011
PDF: 6 pages
Proc. SPIE 7895, Optical Biopsy IX, 78950X (16 February 2011); doi: 10.1117/12.874176
Show Author Affiliations
David R. Rivera, Cornell Univ. (United States)
Demirhan Kobat, Cornell Univ. (United States)
Chris Xu, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 7895:
Optical Biopsy IX
Robert R. Alfano, Editor(s)

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