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Giant single-step upconversion via sub-35-fs phonon dynamics in the nonlinear optical regime
Jingjing Yao1,2, Yahui Li3, Xiaguang Zhang4
1School of Physics and Technology, Center for Nanoscience and Nanotechnology, and Key Laboratory of Artificial Micro- and Nanostructures of Ministry of Education, Wuhan University, Wuhan 430072, China.
Science Advances
|October 15, 2025
Summary
Scientists achieved giant single-step phonon-assisted upconversion in perovskites using ultrafast phonon dynamics. This breakthrough enables integration into nonlinear optics for advanced photonic applications.
Area of Science:
- Physics
- Materials Science
- Optics
Background:
- Phonon-assisted upconversion (UC) is crucial for ultrafast electron-phonon coupling and photonic applications.
- The ultrafast dynamics limit of UC has hindered its use in nonlinear optics.
Purpose of the Study:
- To investigate ultrafast phonon dynamics in single-step upconversion.
- To explore the integration of UC into the nonlinear optical regime.
Main Methods:
- Studied sub-35-femtosecond phonon dynamics in 2D hybrid organic-inorganic perovskites.
- Analyzed nonlinear optical properties and Raman anisotropy.
Main Results:
- Observed giant single-step UC (~200 meV) approaching the phonon dynamics limit (~23 fs).
- Demonstrated energy gain ~8x room-temperature thermal energy.
- Showcased strong nonlinearity and Raman anisotropy due to unique organic-inorganic coupling.
Conclusions:
- This work establishes a new frontier for phonon dynamics and nonlinear optical mechanisms.
- Potential applications include optical refrigeration, energy harvesting, and microscopy.
