Giant two-photon upconversion from 2D exciton in doubly-resonant plasmonic nanocavity.

ABSTRACT: Photon upconversion through high harmonic generation, multiphoton absorption, Auger recombination and phonon scattering performs a vital role in energy conversion and renormalization. Considering the reduced dielectric screening and enhanced Coulomb interactions, semiconductor monolayers provide a promising platform to explore photon upconversion at room temperature. Additionally, two-photon upconversion was recently demonstrated as an emerging technique to probe the excitonic dark states due to the extraordinary selection rule compared with conventional excitation. However, highly efficient two-photon upconversion still remains challenging due to the limited multiphoton absorption efficiency and long radiative lifetimes. Here, a 2440-fold enhancement of two-photon luminescence (TPL) is ac

SUBMITTER: Liu F 

PROVIDER: S-EPMC12423298 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature