Sensors, Volume 23, Issue 9
2023 May-1 - 396 articles
Cover Story: Reflection-mode holographic sensors visibly change color in response to target physical stressors or chemical analytes, making them widely applicable, e.g., in medical diagnostics, environmental monitoring, and smart packaging. Reflection holograms produced in thick photopolymer films, however, are highly angularly selective, making them challenging to view and interpret. We have developed a speckle reflection holography recording technique in order to counteract this. The full width at half maximum of the speckle grating angular selectivity curve is double that of standard reflection gratings. We show the successful use of speckle reflection gratings as colorimetric MPa range pressure sensors. Finally, we present a prototype reflection hologram viewer. While conceptually simple, the viewer is versatile and described as being easy-to-use by non-experts. View this paper - Issues are regarded as officially published after their release is announced to the table of contents alert mailing list .
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