12 February 2018 Bioinspired adaptive gradient refractive index distribution lens
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Inspired by the soft, deformable human eye lens, a synthetic polymer gradient refractive index distribution (GRIN) lens with an adaptive geometry and focal power has been demonstrated via multilayer coextrusion and thermoforming of nanolayered elastomeric polymer films. A set of 30 polymer nanolayered films comprised of two thermoplastic polyurethanes having a refractive index difference of 0.05 were coextruded via forced-assembly technique. The set of 30 nanolayered polymer films exhibited transmission near 90% with each film varying in refractive index by 0.0017. An adaptive GRIN lens was fabricated from a laminated stack of the variable refractive index films with a 0.05 spherical GRIN. This lens was subsequently deformed by mechanical ring compression of the lens. Variation in the optical properties of the deformable GRIN lens was determined, including 20% variation in focal length and reduced spherical aberration. These properties were measured and compared to simulated results by placido-cone topography and ANSYS methods. The demonstration of a solid-state, dynamic focal length, GRIN lens with improved aberration correction was discussed relative to the potential future use in implantable devices.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Kezhen Yin, Kezhen Yin, Chuan-Yar Lai, Chuan-Yar Lai, Jia Wang, Jia Wang, Shanzuo Ji, Shanzuo Ji, James Aldridge, James Aldridge, Jingxing Feng, Jingxing Feng, Andrew Olah, Andrew Olah, Eric Baer, Eric Baer, Michael Ponting, Michael Ponting, } "Bioinspired adaptive gradient refractive index distribution lens," Optical Engineering 57(2), 027101 (12 February 2018). https://doi.org/10.1117/1.OE.57.2.027101 . Submission: Received: 29 August 2017; Accepted: 16 January 2018
Received: 29 August 2017; Accepted: 16 January 2018; Published: 12 February 2018

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