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Title: Thermalization of Fluorescent Protein Exciton–Polaritons at Room Temperature

Journal Article · · Advanced Materials

Fluorescent proteins (FPs) have recently emerged as a serious contender for realizing ultralow threshold room temperature exciton–polariton condensation and lasing. Here, this contribution investigates the thermalization of FP microcavity exciton–polaritons upon optical pumping under ambient conditions. Polariton cooling is realized using a new FP molecule, called mScarlet, coupled strongly to the optical modes in a Fabry–Pérot cavity. Interestingly, at the threshold excitation energy (fluence) of ≈9 nJ per pulse (15.6 mJ cm–2), an effective temperature is observed, Teff ≈ 350 ± 35 K close to the lattice temperature indicative of strongly thermalized exciton–polaritons at equilibrium. This efficient thermalization results from the interplay of radiative pumping facilitated by the energetics of the lower polariton branch and the cavity Q-factor. Direct evidence for dramatic switching from an equilibrium state into a metastable state is observed for the organic cavity polariton device at room temperature via deviation from the Maxwell–Boltzmann statistics at k|| = 0 above the threshold. Thermalized polariton gases in organic systems at equilibrium hold substantial promise for designing room temperature polaritonic circuits, switches, and lattices for analog simulation.

Research Organization:
City College of New York, NY (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF); National Institutes of Health (NIH)
Grant/Contract Number:
OMA-1936351; MCB-2025200; 5G12MD007603-30
OSTI ID:
1981352
Journal Information:
Advanced Materials, Vol. 34, Issue 15; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

References (62)

A room-temperature organic polariton transistor journal March 2019
Bose-Einstein Condensation of Microcavity Polaritons in a Trap journal May 2007
Selective isomer emission via funneling of exciton polaritons journal October 2021
Enhanced Delayed Fluorescence in Tetracene Crystals by Strong Light‐Matter Coupling journal July 2019
All-Optical Exciton-Polariton Transistor at Room Temperature conference January 2019
The Role of Long-Lived Excitons in the Dynamics of Strongly Coupled Molecular Polaritons journal July 2020
A Yellow Polariton Condensate in a Dye Filled Microcavity journal July 2017
Inverting singlet and triplet excited states using strong light-matter coupling journal December 2019
Temperature dependence of the upper-branch polariton population in an organic semiconductor microcavity journal November 2011
Polariton chemistry: controlling molecular dynamics with optical cavities journal January 2018
Strong exciton–photon coupling in an organic semiconductor microcavity journal September 1998
Temperature-Dependence of an Amorphous Organic Thin Film Polariton Laser journal March 2020
Molding Photonic Boxes into Fluorescent Emitters by Direct Laser Writing journal February 2017
Bose–Einstein Condensation of Exciton-Polaritons in Organic Microcavities journal April 2020
mScarlet: a bright monomeric red fluorescent protein for cellular imaging journal November 2016
All-optical polariton transistor journal April 2013
Experimental study of light emission from strongly coupled organic semiconductor microcavities following nonresonant laser excitation journal May 2002
Polariton condensation in an organic microcavity utilising a hybrid metal-DBR mirror journal October 2021
Theory of Strong Coupling between Quantum Emitters and Propagating Surface Plasmons journal March 2013
Enhanced Light–Matter Interaction and Polariton Relaxation by the Control of Molecular Orientation journal September 2021
Thermalization and Cooling of Plasmon-Exciton Polaritons: Towards Quantum Condensation journal October 2013
Low Threshold Polariton Lasing from a Solution‐Processed Organic Semiconductor in a Planar Microcavity journal April 2019
Coherence and Interaction in Confined Room-Temperature Polariton Condensates with Frenkel Excitons journal December 2019
Bose–Einstein condensation in a plasmonic lattice journal April 2018
Polariton-mediated energy transfer between organic dyes in a strongly coupled optical microcavity journal May 2014
Nonlinear interactions in an organic polariton condensate journal February 2014
Vibrationally Assisted Polariton-Relaxation Processes in Strongly Coupled Organic-Semiconductor Microcavities journal July 2011
Effect of molecular Stokes shift on polariton dynamics journal April 2021
Nano-second exciton-polariton lasing in organic microcavities journal September 2020
Room Temperature Broadband Polariton Lasing from a Dye‐Filled Microcavity journal March 2019
Room-temperature polariton lasing in an organic single-crystal microcavity journal April 2010
Control over Energy Transfer between Fluorescent BODIPY Dyes in a Strongly Coupled Microcavity journal November 2017
Intermolecular Interaction Effects on the Ultrafast Depolarization of the Optical Emission from Conjugated Polymers journal January 2007
Formation of an Exciton Polariton Condensate: Thermodynamic versus Kinetic Regimes journal October 2008
Room-Temperature Topological Polariton Laser in an Organic Lattice journal July 2021
Tunable Third-Harmonic Generation from Polaritons in the Ultrastrong Coupling Regime journal August 2017
Strong coupling between surface plasmon polaritons and emitters: a review journal December 2014
Single-photon nonlinearity at room temperature journal September 2021
Room-temperature superfluidity in a polariton condensate journal June 2017
Intermolecular states in organic dye dispersions: excimers vs. aggregates journal January 2017
Hybrid Light–Matter States in a Molecular and Material Science Perspective journal October 2016
Bose–Einstein condensation of exciton polaritons journal September 2006
Room temperature organic exciton–polariton condensate in a lattice journal June 2020
Dispersion of Third‐Harmonic Generation in Organic Cavity Polaritons journal May 2019
Bose-Einstein Condensation of Long-Lifetime Polaritons in Thermal Equilibrium journal January 2017
Manipulating matter by strong coupling to vacuum fields journal July 2021
Bright Polariton Coumarin-Based OLEDs Operating in the Ultrastrong Coupling Regime journal June 2018
Strong exciton–photon coupling in organic materials journal April 2007
Temperature dependence of polariton lasing in a crystalline anthracene microcavity journal July 2012
Ultrafast thermal modification of strong coupling in an organic microcavity journal January 2021
Room-temperature Bose–Einstein condensation of cavity exciton–polaritons in a polymer journal December 2013
Mechanisms of blueshifts in organic polariton condensates journal January 2020
Sub-picosecond thermalization dynamics in condensation of strongly coupled lattice plasmons journal June 2020
Time-resolved stimulated emission depletion and energy transfer dynamics in two-photon excited EGFP journal April 2018
Propagating Hybrid Tamm Exciton Polaritons in Organic Microcavity journal October 2019
Characterizing the Electroluminescence Emission from a Strongly Coupled Organic Semiconductor Microcavity LED journal May 2013
Ultrastrongly Coupled Exciton-Polaritons in Metal-Clad Organic Semiconductor Microcavities journal August 2013
Strong Coupling in Fully Tunable Microcavities Filled with Biologically Produced Fluorescent Proteins journal November 2016
High-Efficiency Second-Harmonic Generation from Hybrid Light-Matter States journal November 2016
Coupling of exciton-polaritons in low Q coupled microcavities beyond the rotating wave approximation journal October 2015
An exciton-polariton laser based on biologically produced fluorescent protein journal August 2016
Strong Coupling between Surface Plasmons and Excitons in an Organic Semiconductor journal July 2004