Formation of micro protrusive lens arrays atop poly(methyl methacrylate)

Zhao, Yong; Wang, Chang Chun; Huang, Wei Min; Purnawali, Hendra; An, Lin

doi:10.1364/oe.19.026000

Cited by 23 publications

(21 citation statements)

References 25 publications

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“…Instead of following tradition lens fabrication methods, we immerse a piece of 2-dimensional or 3-dimensional PMMA with an array of pre-indented micro indents atop into room temperature ethanol. After nine hours, an array of microlens is produced [103].…”

Section: Swellingmentioning

confidence: 99%

“…PMMA microlens array presented in Figure 9 is achievable also due to the influence of pre-compression at room temperature so that the material right underneath the indents has a much higher ethanol penetration speed than the rest of the un-indented part. Consequently, the indented part swells significantly well before the rest and, hence, the microlens array is produced [103]. Figure 11 presents a piece of PMMA which is pre-stretched at high temperatures before immersing into room temperature ethanol.…”

Section: Dissolvingmentioning

confidence: 99%

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Mechanisms of the Shape Memory Effect in Polymeric Materials

et al. 2013

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Abstract:This review paper summarizes the recent research progress in the underlying mechanisms behind the shape memory effect (SME) and some newly discovered shape memory phenomena in polymeric materials. It is revealed that most polymeric materials, if not all, intrinsically have the thermo/chemo-responsive SME. It is demonstrated that a good understanding of the fundamentals behind various types of shape memory phenomena in polymeric materials is not only useful in design/synthesis of new polymeric shape memory materials (SMMs) with tailored performance, but also helpful in optimization of the existing ones, and thus remarkably widens the application field of polymeric SMMs.

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Section: Swellingmentioning

confidence: 99%

Section: Dissolvingmentioning

confidence: 99%

Mechanisms of the Shape Memory Effect in Polymeric Materials

et al. 2013

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“…Such attractive features enable its applications in solar, sensor, battery electrolytes, optical, and conductive devices [34][35][36][37]. The SME of PMMA triggered by heating or solvent absorption in small strain condition has been previously reported [38][39][40].…”

Section: Introductionmentioning

confidence: 91%

Controlled evolution of surface patterns for ZnO coated on stretched PMMA upon thermal and solvent treatments

Liu

Huang

et al. 2018

Composites Part B: Engineering

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Poly (methyl methacrylate) (PMMA) possesses the excellent optical properties and thermal stabilities, its shape memory effect can be triggered by heating or solvent absorption. Zinc oxide (ZnO) films, the most common semiconductor materials, were usually deposited on polymer substrates as a transparent conductive element for applications to electro-optical devices. In this paper, ZnO films with different thicknesses were deposited on PMMA substrates with different pre-strains. The influences of the shape memory effect (SME), thermal expansion mismatch, and ethanol soaking on the evolutions of surface topographies were systematically investigated.Results revealed that the isotropic wrinkles without any preferential orientation were induced by the thermal expansion coefficient mismatch between ZnO film and PMMA substrate during annealing. The well-aligned wrinkles perpendicular to the direction of pre-strain resulted from the SME of PMMA triggered by heating. In addition, cracks appeared instead of wrinkles since the isotropic swelling of PMMA upon soaking in ethanol.

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“…Zhao et. al [20] proposed a simple two-step process for protrusive lens arrays. The lenslet diameter and height are highly sensitive to applied load to the indents/protrusions and hence, the process is not suitable for the larger sized lenses (i.e., in millimeter and above scale).…”

Section: Introductionmentioning

confidence: 99%