@article{12cf4a439ce3415ab28515497c0b94ea,
title = "Strong Coupling between Plasmons and Molecular Excitons in Metal-Organic Frameworks",
abstract = "This Letter describes strong coupling of densely packed molecular emitters in metal-organic frameworks (MOFs) and plasmonic nanoparticle (NP) lattices. Porphyrin-derived ligands with small transition dipole moments in an ordered MOF film were grown on Ag NP arrays. Angle-resolved optical measurements of the MOF-NP lattice system showed the formation of a polariton that is lower in energy and does not cross the uncoupled MOF Q1 band. Modeling predicted the upper polariton energy and a calculated Rabi splitting of 110 meV. The coupling strength was systematically controlled by detuning the plasmon energy by changing the refractive index of the solvents infiltrating the MOF pores. Through transient absorption spectroscopy, we found that the lower polariton decays quickly at shorter time scales (<500 ps) and slowly at longer times because of energy transfer from the upper polariton. This hybrid system demonstrates how MOFs can function as an accessible excitonic material for polariton chemistry.",
keywords = "conformal coating, metal-organic framework, plasmonic nanoparticle array, surface lattice resonance, ultrafast spectroscopy",
author = "Sample, {Alexander D.} and Jun Guan and Jingtian Hu and Thaddeus Reese and Cherqui, {Charles R.} and Park, {Jeong Eun} and Francisco Freire-Fern{\'a}ndez and Schaller, {Richard D.} and Schatz, {George C.} and Odom, {Teri W.}",
note = "Funding Information: This work was supported by the Vannevar Bush Faculty Fellowship from the U.S. Department of Defense (DOD N00014-17-1-3023) and the Office of Naval Research (ONR N00014-21-1-2289). C.R.C. and G.C.S. (theory) were funded by the Department of Energy, Office of Basic Energy Sciences under grant DE-SC0004752. This work made use of the NUFAB, EPIC, and SPID facilities of Northwestern University{\textquoteright}s NUANCE Center and the Jerome B.Cohen X-ray Diffraction Facility, which have received support from the SHyNE Resource (NSF ECCS-2025633), the IIN, and Northwestern{\textquoteright}s MRSEC Program (NSF DMR-1720139). This work also made use of the Pritzker Nanofabrication Facility, which receives partial support from the SHyNE Resource, a node of the NSF National Nanotechnology Coordinated Infrastructure (NSF ECCS-2025633). Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The authors thank Dr. Stephen A. Miller and the Northwestern University Laser and Electronics Design Core Facility for assistance on instrumentation. Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",
year = "2021",
month = sep,
day = "22",
doi = "10.1021/acs.nanolett.1c02740",
language = "English (US)",
volume = "21",
pages = "7775--7780",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "18",
}