Responsive Spiral Photonic Structures for Visible Vapor Sensing, Pattern Transformation and Encryption

Author:

Qian Jing1,Kolagatla Srikanth2,Pacalovas Aleksejus2,Zhang Xia1,Florea Larisa2ORCID,Bradley A. Louise1ORCID,Delaney Colm2ORCID

Affiliation:

1. School of Physics and AMBER, The SFI Research Centre for Advanced Materials and Bio‐Engineering Research Trinity College Dublin Dublin 2 D02 Ireland

2. School of Chemistry & AMBER, The SFI Research Centre for Advanced Materials and Bio‐Engineering Research Trinity College Dublin Dublin 2 D02 Ireland

Abstract

AbstractTwo 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.

Funder

H2020 European Research Council

Science Foundation Ireland

European Regional Development Fund

Irish Research Council

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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