Dr. Sudheendran Mavila Profile

Dr. Sudheendran Mavila

at Univ of Colorado Boulder

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Publications (4)

Proceedings Article | 9 April 2024 Presentation + Paper

Use of molecular design and synthesis to improve polymeric holographic photopolymer materials

Yunfeng Hu, Marvin Alim, Sudheendran Mavila, Maciej Podgórski, Jamie Kowalski, Amy Sullivan, Robert Mcleod, Christopher Bowman

Proceedings Volume 12957, 129570L (2024) https://doi.org/10.1117/12.3010876

KEYWORDS: Refractive index, Holography, Diffusion, Matrices, Modulation, Polymers, Photopolymers

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Breakthroughs in holographic optical devices frequently rely on advances in high-refractive-index photopolymer materials (HRIPs). While significant progress has been made in the pursuit of HRIPs, additional considerations have prevented broad application of photopolymerization-based materials for fabricating high-performance holographic gratings. To address the deficiency of suitable high-refractive-index monomers for holographic recording, our recent works were conducted from two main aspects, which are (1) monomer synthesis to improve the theoretical refractive index contrast between photopolymer and matrix (or binder), and (2) formulation manipulation for improving segregation degree between photopolymer and matrix (or binder). We have explored several synthetic approaches to obtain high-refractive-index acrylate monomers (nD=1.6) of high miscibility with matrix, multifunctional low-viscosity, high-refractive-index thiol-ene and thiol-yne monomers (nD=1.6). Combining with polyurethane matrix (binder) with a refractive index of 1.48, these monomers exhibit a high theoretical peak-to-valley index contrast of more than 0.12. To fully utilize the high theoretical index contrast, thiol-ene click chemistry in combination with a linear functionalized polymer binder was explored to achieve a high refractive index modulation(peak-to-mean) close to 0.04. Meanwhile, in the thiol-ene formulations, a variety of chemical modification methods, which can be readily translated into other material systems, were proposed, and studied to manipulate the rates of reaction and diffusion processes during holographic recording to optimize the refractive index modulation. The dramatic difference of achievable refractive index modulation in similar thiol-ene formulations with close theoretical index contrast was observed in such study. The difference underscores the importance of customized strategies and systematic formulation manipulation for achieving high-performance holographic photopolymers.

Proceedings Article | 7 March 2022 Presentation

Holographic photopolymers using thiol-ene chemistry

Yunfeng Hu, Sudheendran Mavila, Maciej Podgorski, Jamie Kowalski, Robert McLeod, Christopher Bowman

Proceedings Volume PC12026, PC1202601 (2022) https://doi.org/10.1117/12.2607658

KEYWORDS: Holography, Chemistry, Photopolymers, Polymers, Holograms, Diffusion, Refractive index, Oxygen, Multiplexing, Matrices

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Proceedings Article | 23 April 2019 Paper

Two-stage holographic photopolymers with high dynamic range

Marvin Alim, David Glugla, Sudheendran Mavila, Chen Wang, Philip Nystrom, Amy Sullivan, Robert McLeod, Christopher Bowman

Proceedings Volume 11030, 110300D (2019) https://doi.org/10.1117/12.2522148

KEYWORDS: Refractive index, Holography, Photopolymers, Holograms, Diffraction, Polymerization, Volume holography, Transparency

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Proceedings Article | 19 February 2018 Paper

High dynamic range two-stage photopolymer materials through enhanced solubility high refractive index writing monomers

Marvin Alim, Sudheendran Mavila, David Glugla, Chen Wang, Philip Nystrom, Amy Sullivan, Christopher Bowman, Robert McLeod

Proceedings Volume 10558, 105580D (2018) https://doi.org/10.1117/12.2290029

KEYWORDS: Refractive index, Holography, Holograms, Polymers, Holographic optical elements, Photopolymers, Volume holography, GRIN lenses

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