Mr. Matthew Van Soelen Profile

Matthew Van Soelen

at College of New Jersey

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Proceedings Article | 15 March 2023 Presentation + Paper

Direct laser writing of micrograting arrays using a spatial light modulator

Jonas Strobelt, Matthew Van Soelen, David McGee

Proceedings Volume 12433, 1243304 (2023) https://doi.org/10.1117/12.2647393

KEYWORDS: Spatial light modulators, Diffractive optical elements, Optical gratings, Optical surfaces, Polarized light, Matrices, Reflection, Fabrication, Polarization, Optical components

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Surface micrograting arrays have applications ranging from diffractive optics to bioengineered surfaces. We report a versatile fabrication platform for the maskless photofabrication of these arrays based on structured polarized light and photoresponsive azopolymer films. The films are patterned using a spatial light modulator (SLM) configured as a polarization modulator. The light source is a 488 nm laser with exposure times of order 5 sec or less. Structured polarized light from the SLM is imaged onto the film, writing a 120 µm x 80 µm surface relief pattern with amplitudes and periods controllable from 25 nm to 1 µm and 700 nm- 10 µm respectively. These are stitched into larger area patterns via XY translation. The versatility is demonstrated through a variety of micrograting patterns, including diffractive optical elements, multiplexed surface grating arrays, and diffractive optically variable image devices for optical security applications. In a different application, the biocompatibility of the polymeric film can be leveraged since cellular interaction with synthetic microscale structures influences a wide array of cell responses. We demonstrate this by showing directed cell growth mediated by the micrograting array. In all examples, the surface gratings required no post-exposure processing, are stable in ambient conditions, and can be replicated using nanoimprint lithography.

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