Fig. 2: Photopolymerization approaches for achieving hydrogel-based tunable photonic devices. | Microsystems & Nanoengineering

Fig. 2: Photopolymerization approaches for achieving hydrogel-based tunable photonic devices.

From: Hydrogels for active photonics

Fig. 2: Photopolymerization approaches for achieving hydrogel-based tunable photonic devices.

a Different structural colors obtained by spatially varying the degree of polymerization using a photomask93. b Macroporous hydrogel for tuning between the transparent state and iridescent state97. c Water- and pH-responsive hydrogel composite made of PS beads and PEGDA98. d Temperature-responsive hydrogel composite made of PS beads and PNIPAm99. e Magnetic structural color hydrogel composite made of superparamagnetic nanoparticles and PEGDA hydrogel100. Reproduced with permission from Wiley (2018), Wiley (2020), ACS Publishing Center (2021), ACS Publishing Center (2022), and ACS Publishing Center (2022)

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