Diffraction efficiencies of three types of bioplastic gratings based on chitosan from seafood waste

Efren G. Gumayan; Ian Ken D. Dimzon; Raphael A. Guerrero

doi:10.1117/12.2688352

29 November 2023 Diffraction efficiencies of three types of bioplastic gratings based on chitosan from seafood waste

Efren G. Gumayan, Ian Ken D. Dimzon, Raphael A. Guerrero

Proceedings Volume 12778, Optifab 2023; 1277813 (2023) https://doi.org/10.1117/12.2688352
Event: SPIE Optifab, 2023, Rochester, New York, United States

Conference Poster

Abstract

We report an initiative on promoting sustainability in optical manufacturing by repurposing waste materials as bioplastic diffractive elements. Bioplastic diffraction gratings are fabricated from three chitosan solutions via soft lithography. Chitosan is prepared from seafood waste in the form of powdered crab shells through demineralization, deproteination, depigmentation, and deacetylation. For soft lithography of chitosan gratings, a mold is constructed from a polydimethylsiloxane (PDMS) grating replica of a commercial master grating with groove density of 600 lines/mm. The three chitosan solutions are each poured into the PDMS mold and allowed to harden. Once fully cured, the chitosan replicas are carefully extracted from the mold. We perform diffraction experiments at normal incidence with an Ar+ laser operating at 514.5 nm and 25 mW. Measured first-order power efficiency of the unmodified chitosan grating is 0.7%. The bioplastic gratings made from chitosan-starch and chitosan-glycerol both exhibit a first-order diffraction efficiency of 0.5%. These values are comparable with the 0.9% first-order efficiency of the PDMS replica used in the molding process.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Efren G. Gumayan, Ian Ken D. Dimzon, and Raphael A. Guerrero "Diffraction efficiencies of three types of bioplastic gratings based on chitosan from seafood waste", Proc. SPIE 12778, Optifab 2023, 1277813 (29 November 2023); https://doi.org/10.1117/12.2688352

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