Responsive spiral photonic structures for visible vapor sensing, pattern transformation and encryption
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2023Access:
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J. Qian, S. Kolagatla, A. Pacalovas, X. Zhang, L. Florea, A. L. Bradley, and C. Delaney, Responsive spiral photonic structures for visible vapor sensing, pattern transformation and encryption, Advanced Functional Materials, 2023Download Item:
Abstract:
Two photon polymerisation using direct laser writing is a burgeoning field of research, with recent focus being placed on bringing added value to microstructures, by incorporating soft, responsive polymers. Moving to the micron-scale can have a profound impact on such stimuli-responsive materials, whose speed of actuation can be increased many-fold compared to their mm-scale counterparts. Here, the fabrication of submicron 2D photonic structures, based on a vapor-responsive photoresist with a refractive index <1.55, in the visible wavelength range. The fabricated concentric spiral arrays are evaluated for their feasibility as vapor sensors by testing spectral and structural color reproducibility and reversibility under water, ethanol, isopropanol, and acetone vapors. This approach allows for the realization of predictable uniform color displays that can be modulated upon stimuli response. The transmitted colour in the dry and hydrated states can be accurately modelled. This knowledge is used to design and demonstrate structures for cloaking and image transformation. Such capability can be used for encryption and anti-counterfeiting applications.
Sponsor
Grant Number
Irish Research Council (IRC)
GOIPD/2020/484
European Union (EU)
899349
European Research Council (ERC)
802929
Science Foundation Ireland (SFI)
17/RC-PhD/348
Science Foundation Ireland (SFI)
16/IA/4550
Science Foundation Ireland (SFI)
12/RC/2278_P2
Author's Homepage:
http://people.tcd.ie/florealhttp://people.tcd.ie/cdelane5
http://people.tcd.ie/bradlel
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Advanced Functional Materials;Availability:
Full text availableKeywords:
4D printing, Responsive structures, Vapor sensing, Encryption, Structural colorSubject (TCD):
Nanoscience & Materials , Materials, Structure and Phase , Nanotechnology , Optical materials , PolymersDOI:
10.1002/adfm.202211735Source URI:
https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.202211735Metadata
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