Hyperchromatic structural color for perceptually enhanced sensing by the naked eye

Proceedings of the National Academy of Sciences of the United States of America
Tahmid H TalukdarJudson D Ryckman

Abstract

Colorimetric sensors offer the prospect for on-demand sensing diagnostics in simple and low-cost form factors, enabling rapid spatiotemporal inspection by digital cameras or the naked eye. However, realizing strong dynamic color variations in response to small changes in sample properties has remained a considerable challenge, which is often pursued through the use of highly responsive materials under broadband illumination. In this work, we demonstrate a general colorimetric sensing technique that overcomes the performance limitations of existing chromatic and luminance-based sensing techniques. Our approach combines structural color optical filters as sensing elements alongside a multichromatic laser illuminant. We experimentally demonstrate our approach in the context of label-free biosensing and achieve ultrasensitive and perceptually enhanced chromatic color changes in response to refractive index changes and small molecule surface attachment. Using structurally enabled chromaticity variations, the human eye is able to resolve ∼0.1-nm spectral shifts with low-quality factor (e.g., Q ∼ 15) structural filters. This enables spatially resolved biosensing in large area (approximately centimeters squared) lithography-free sensin...Continue Reading

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Citations

Sep 9, 2021·Angewandte Chemie·Zeying ZhangYanlin Song

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Methods Mentioned

BETA
biosensing
surface plasmon resonance
biosensors
chip
scanning electron micrscopy

Software Mentioned

Versalume
pspectro
MATLAB

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