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Ultrafast thermal modification of strong coupling in an organic microcavity

Journal Article · · APL Photonics
DOI:https://doi.org/10.1063/5.0031560· OSTI ID:1852416
 [1];  [2];  [3]
  1. City College of New York, NY (United States); City College of New York, NY (United States)
  2. City College of New York, NY (United States); City Univ. of New York (CUNY), NY (United States)
  3. City Univ. of New York (CUNY), NY (United States)
There is growing interest in using strongly coupled organic microcavities to tune molecular dynamics, including the electronic and vibrational properties of molecules. However, very little attention has been paid to the utility of cavity polaritons as sensors for out-of-equilibrium phenomena, including thermal excitations. Here, we demonstrate that non-resonant infrared excitation of an organic microcavity system induces a transient response in the visible spectral range near the cavity polariton resonances. We show how these optical responses can be understood in terms of ultrafast heating of electrons in the metal cavity mirror, which modifies the effective refractive index and subsequently the strong coupling conditions. The temporal dynamics of the microcavity are strictly determined by carriers in the metal, including the cooling of electrons via electron–phonon coupling and excitation of propagating coherent acoustic modes in the lattice. We rule out multiphoton excitation processes and verify that no real polariton population exists despite their strong transient features. These results suggest the cavity polaritons to be promising as sensitive probes of non-equilibrium phenomena.
Research Organization:
City Univ. of New York (CUNY), NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0017760; SC0012704
OSTI ID:
1852416
Alternate ID(s):
OSTI ID: 1756487
Journal Information:
APL Photonics, Journal Name: APL Photonics Journal Issue: 1 Vol. 6; ISSN 2378-0967
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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