Abstract
A synthetic polymeric lens was designed and fabricated based on a bio-inspired, "Age=5" human eye lens design by utilizing a nanolayered polymer film-based technique. The internal refractive index distribution of an anterior and posterior GRIN lens were characterized and confirmed against design by µATR-FTIR. 3D surface topography of the fabricated aspheric anterior and posterior lenses was measured by placido-cone topography and exhibited confirmation of the desired aspheric surface shape. Furthermore, the wavefronts of aspheric posterior GRIN and PMMA lenses were measured and simulated by interferometry and Zemax software, respectively. Their results show that the gradient index distribution reduces the overall wavefront error as compared a homogenous PMMA lens of an identical geometry. Finally, the anterior and posterior GRIN lenses were assembled into a bio-inspired GRIN human eye lens through which a clear imaging was possible.
Highlights
Many biological optical systems utilize a gradient refractive index (GRIN) lens, an optic that possess an internal refractive index, to enhance focusing power, increase field of view, and correct for optical aberrations [1]
The internal refractive index distribution of an anterior and posterior GRIN lens were characterized and confirmed against design by μATR-FTIR. 3D surface topography of the fabricated aspheric anterior and posterior lenses was measured by placido-cone topography and exhibited confirmation of the desired aspheric surface shape
Polymeric based GRIN material fabrication techniques, including interface-gel copolymerization [11] and plasmonics [12] approaches have the necessary magnitude in available refractive index gradient, a n up to 0.08 is possible; they are limited by the internal refractive index distribution control, or the overall lens size due to fabrication techniques, or material diffusion coefficients
Summary
A synthetic polymeric lens was designed and fabricated based on a bio-inspired, ?Age=5? human eye lens design by utilizing a nanolayered polymer film-based technique. A synthetic polymeric lens was designed and fabricated based on a bio-inspired, ?Age=5? The internal refractive index distribution of an anterior and posterior GRIN lens were characterized and confirmed against design by μATR-FTIR. The wavefronts of aspheric posterior GRIN and PMMA lenses were measured and simulated by interferometry and Zemax software, respectively. Their results show that the gradient index distribution reduces the overall wavefront error as compared a homogenous PMMA lens of an identical geometry. The anterior and posterior GRIN lenses were assembled into a bio-inspired GRIN human eye lens through which a clear imaging was possible.
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