Issue Cover of the Journal MDPI Sensors
Hot off the presses! A new study carried out by TU Dublin researchers was successfully chosen for the issue cover of the journal MDPI Sensors. The open-access paper is a collaborative effort between TU Dublin's School of Physics, Clinical and Optometric Sciences, the Centre for Industrial and Engineering Optics, and the School of Creative Arts.
Title: Improving the Angular Visibility of Photopolymer-Based Reflection Holograms for Sensing Applications
Dr. Tatsiana Mikulchyk, Dr. Kevin Murphy, John Walsh, Dr. Suzanne Martin, Dr. Dervil Cody, and Prof. Izabela Naydenova
Summary: 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. The authors 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. The authors show the successful use of speckle reflection gratings as colorimetric MPa range pressure sensors. Finally, they present a prototype reflection hologram viewer. While conceptually simple, the viewer is versatile and described as being easy-to-use by non-experts.
The full paper can be accessed here