研究目的
To realize multimode exciton-polaritons in single-crystalline microplates of a layered metal-organic framework using a cost-effective solvothermal synthesis method, eliminating the need for complex cavity fabrication.
研究成果
Multimode exciton-polaritons were successfully demonstrated in MOF microplates at room temperature through strong coupling between inherent Fabry-Perot cavity modes and Frenkel excitons from dye linkers. The solvothermal synthesis offers a cost-effective, scalable approach for polaritonic devices in visible and NIR ranges, with good thermal and chemical stability. This introduces MOFs as a new material class for exploring quantum phenomena like Bose-Einstein condensation and polariton lasers.
研究不足
Theoretical modelling errors (5-9% discrepancy with experimental values) due to disregarding interactions with H4L ligand and Zn atoms. Slight imperfections in microplates reduced cavity quality, affecting Rabi splitting consistency. No observation of exciton-polaritons with lower-dimer exciton due to weak transition dipole moment. Thermally-induced damage above 3.8 kW/cm2 excitation power limits high-power applications.
1：Experimental Design and Method Selection:
The study combined experimental techniques (photoluminescence spectroscopy, angle-resolved reflectivity measurements, time-resolved PL spectroscopy) with theoretical modelling (coupled oscillator Hamiltonian, Davydov splitting theory) to investigate exciton-polariton formation in MOF microplates.
2：Sample Selection and Data Sources:
MOF microplates of various thicknesses (
3：1 μm, 5 μm, 1 μm) were synthesized via solvothermal method using Zn(NO3)2·6H2O, Rhodamine B, and H4L in DMF and H2O. Rh B solutions at different concentrations were used for comparison. List of Experimental Equipment and Materials:
Equipment included a Nikon Eclipse Ti2 microscope, Melles Griot Solid State Laser (403 nm), Oceanoptics QEPro spectrometer, Mettler Toledo Star System for TGA, PicoHarp 300 for time-correlated single photon counting, and a home-made Fourier imaging setup. Materials included Zn(NO3)2·6H2O, Rh B, H4L, DMF, H2O, methanol, and commercial chemicals from Sigma-Aldrich, Alfa Aesar, TCI, S. D. Fine Chemicals.
4：Experimental Procedures and Operational Workflow:
Synthesis involved heating the mixture at 90°C for 3 days. PL measurements used a 403 nm laser focused through a 20x objective. Angle-resolved reflectivity used a white light source with a linear polarizer and translational slit to vary incidence angles. Time-resolved PL used a femtosecond laser (515 nm). Data were analyzed using coupled oscillator models.
5：Data Analysis Methods:
Data were analyzed using theoretical models for energy levels (Davydov splitting), Hamiltonian simulations for polariton branches, and statistical comparisons of PL and reflectivity spectra.
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