Performance evaluation of GRIN lenses by ray tracing method |
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Authors: | Shuma Horiuchi Shuhei Yoshida Zenta Ushiyama and Manabu Yamamoto |
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Institution: | (1) Department of Electrical Engineering, National Chiao Tung University, Hsinchu, 300, Taiwan;(2) Institute of Imaging and Biophotonics, National Chiao Tung University, Tainan, Taiwan; |
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Abstract: | Plastic gradient-index lenses produce clear images with negligible aberration and distortion. One of the methods for fabricating
these lenses involves pulling up the core fiber vertically from a polymer solution whose refractive index has been adjusted
to the desired value. Since the molecules from the solution diffuse into the inner layer, the monomer components are distributed
in the radial direction. The monomer distribution is fixed in the photopolymerization process, and this forming process is
repeated several times with adjusting the composition of the solution; hence, a specific refractive index distribution is
obtained. We considered a numerical model of the interdiffusion process and analyzed refractive index distribution that could
well reproduce the experimental results. Moreover, we employed the ray tracing method to calculate the modulation transfer
function and used the transfer function to evaluate the GRIN lens performance. Simulation results showed that our evaluation
method well duplicates the experimental results. We thus developed an integrated simulation method for the fabrication and
performance evaluation of GRIN lenses. |
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