Purcell-enhanced quantum yield from carbon nanotube excitons coupled to plasmonic nanocavities

Yue Luo, Ehsaneh D. Ahmadi, Kamran Shayan, Yichen Ma, Kevin S. Mistry, Changjian Zhang, James Hone, Jeffrey L. Blackburn and Stefan Strauf ()
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Yue Luo: Stevens Institute of Technology
Ehsaneh D. Ahmadi: Stevens Institute of Technology
Kamran Shayan: Stevens Institute of Technology
Yichen Ma: Stevens Institute of Technology
Kevin S. Mistry: National Renewable Energy Laboratory
Changjian Zhang: Columbia University
James Hone: Columbia University
Jeffrey L. Blackburn: National Renewable Energy Laboratory
Stefan Strauf: Stevens Institute of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Single-walled carbon nanotubes (SWCNTs) are promising absorbers and emitters to enable novel photonic applications and devices but are also known to suffer from low optical quantum yields. Here we demonstrate SWCNT excitons coupled to plasmonic nanocavity arrays reaching deeply into the Purcell regime with Purcell factors (F P) up to F P = 180 (average F P = 57), Purcell-enhanced quantum yields of 62% (average 42%), and a photon emission rate of 15 MHz into the first lens. The cavity coupling is quasi-deterministic since the photophysical properties of every SWCNT are enhanced by at least one order of magnitude. Furthermore, the measured ultra-narrow exciton linewidth (18 μeV) reaches the radiative lifetime limit, which is promising towards generation of transform-limited single photons. To demonstrate utility beyond quantum light sources we show that nanocavity-coupled SWCNTs perform as single-molecule thermometers detecting plasmonically induced heat at cryogenic temperatures in a unique interplay of excitons, phonons, and plasmons at the nanoscale.

Date: 2017
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DOI: 10.1038/s41467-017-01777-w

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