TPL-fabricated responsive hydrogel-based micro photonic structures for visible vapor sensing

Jing Qian; Srikanth Kolagatla; Aleksejus Pacalova; Xia Zhang; Larisa Florea; Colm Delaney; A. Louise Bradley

doi:10.1117/12.2676845

5 October 2023 TPL-fabricated responsive hydrogel-based micro photonic structures for visible vapor sensing

Jing Qian, Srikanth Kolagatla, Aleksejus Pacalova, Xia Zhang, Larisa Florea, Colm Delaney, A. Louise Bradley

Proceedings Volume 12663, Molecular and Nanophotonic Machines VI; 1266304 (2023) https://doi.org/10.1117/12.2676845
Event: SPIE Organic Photonics + Electronics, 2023, San Diego, California, United States

Abstract

Two photon lithography (TPL) is a versatile method for the fabrication of photonic structures based on photoresist materials. Structures producing vivid colors in transmission or reflection can be achieved. Combining TPL with smart hydrogels opens the route to reversible sensors for a wide range of external stimuli. The printing resolution for TPL can reach 300 nm. As the scale of the smart hydrogel is decreased from the millimeter to the micron level, its actuation speed can be increased many-fold. Herein, we report on a square spiral shaped vapor responsive hydrogel photonic structure. The structural color is shown to be reproducible and reversible under exposure to water, ethanol, IPA and acetone vapor. The influence of the fabrication laser power on the structure dimension and vapor responsivity are also demonstrated, with structures fabricated using a higher laser power producing a larger vapor sensitive spectral response. Finite difference time domain simulations accurately predict the structural color and confirm expansion of the structure when exposed to the vapors is the dominant contribution for the color transformation. Structures for pattern transformation and encryption are also demonstrated.

Citation Download Citation

Jing Qian, Srikanth Kolagatla, Aleksejus Pacalova, Xia Zhang, Larisa Florea, Colm Delaney, and A. Louise Bradley "TPL-fabricated responsive hydrogel-based micro photonic structures for visible vapor sensing", Proc. SPIE 12663, Molecular and Nanophotonic Machines VI, 1266304 (5 October 2023); https://doi.org/10.1117/12.2676845

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KEYWORDS

Color

Transmittance

Design and modelling

Finite-difference time-domain method

Hydrogels

Simulations

Photonic microstructures

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