Researchers unlock quantum infrared sensing with a new screen

Researchers have achieved over three orders of magnitude enhancement in upconversion emission by integrating lanthanide nanoparticles with a metasurface, potentially reshaping infrared imaging sensitivity. The work demonstrates a new approach to infrared-to-visible light conversion, where infrared information is transformed into visible photons using upconverting nanoparticles. The metasurface design maintains uniform enhancement across all relevant viewing angles, preserving image clarity. This hybrid screen offers a path toward “compact, detector-free, and scalable infrared imaging technologies” based on optical upconversion, according to the study published in Light: Science & Applications. The titanium dioxide metasurface employed in this work supports optical resonances at excitation and emission bands critical for upconversion, a strategy designed to amplify infrared signal strength. Researchers integrated this metasurface with alloyed NaYb₀. ₈Er₀. ₂F₄@NaYF₄ upconverting nanoparticles (UCNPs) to create a hybrid screen capable of significantly boosting infrared-to-visible light conversion efficiency. These UCNPs, unlike those with lower lanthanide concentrations, are fully composed of ytterbium and erbium ions, functioning as both sensitizers and emitters to maximize brightness, particularly under weak infrared illumination,…