Purcell-Enhanced Quantum Yield from Carbon Nanotube Excitons Coupled to Plasmonic Nanocavities

Jeffrey Blackburn, Yue Luo, Ehsaneh Ahmadi, Kamran Shayan, Yichen Ma, Kevin Mistry, Changjian Zhang, James Hone, Stefan Strauf

Research output: Contribution to journalArticlepeer-review

97 Scopus Citations

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.

Original languageAmerican English
Article numberArticle No. 1413
Number of pages9
JournalNature Communications
Volume8
Issue number1
DOIs
StatePublished - 1 Dec 2017

Bibliographical note

Publisher Copyright:
© 2017 The Author(s).

NREL Publication Number

  • NREL/JA-5900-68251

Keywords

  • carbon nanotube
  • plasmonic
  • quantum computing
  • quantum yield
  • solar-photochemistry

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