Purcell effect's elevated excitation rate, magnified light collection, and quantum efficiency yields 2,440X 2-photon upconversion from 2D excitons

https://www.eurekalert.org/news-releases/1098974

"doubly-resonant plasmonic nanocavity... 2D semiconductor dichalcogenides monolayers exhibit reduced dielectric screening/ enhanced Coulomb interactions... plasmonic nanocavity patch antenna collects 59.1% of emitted light, 1.6X better... strong field enhancement in both in-plane/ out-of-plane components... cost-effective single-resonance-enhanced 2nd harmonic generation thermally tuned dual-resonance upconversion... high-performance nonlinear photonic devices"