Demonstration of a no-moving-parts axial scanning confocal microscope using liquid crystal optics |
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Authors: | Sajjad A. Khan Nabeel A. Riza |
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Affiliation: | Photonic Information, Processing Systems Laboratory, College of Optics and Photonics/Center for Research and Education in Optics and Lasers (CREOL), University of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816-2700, United States |
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Abstract: | For the first time, to the best of authors’ knowledge, a no-moving-parts axial scanning confocal microscope (ASCM) system is designed and demonstrated using a combination of a large diameter liquid crystal (LC) lens and a classical microscope objective lens. By electrically controlling the 5 mm diameter LC lens, the 633 nm wavelength focal spot is moved continuously over a 48 μm range with a measured 3-dB axial resolution of 3.1 μm using a 0.65 numerical aperture (NA) micro-objective lens. The ASCM is successfully used to image an Indium Phosphide (InP) twin square optical waveguide sample with a 10.2 μm waveguide pitch and 2.3 μm height and width. Using fine analog electrical control of the LC lens, a super-fine sub-wavelength axial resolution of 270 nm is demonstrated. The proposed ASCM can be useful in various precision three-dimensional (3D) imaging and profiling applications. |
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