Tuning and Switching a Plasmonic Quantum Dot 'Sandwich' in a Nematic Line Defect

Jao Van De Lagemaat, Haridas Mundoor, Ghadah Sheetah, Paul Ackerman, Ivan Smalyukh, Sungoh Park

Research output: Contribution to journalArticlepeer-review

21 Scopus Citations


We study the quantum-mechanical effects arising in a single semiconductor core/shell quantum dot (QD) controllably sandwiched between two plasmonic nanorods. Control over the position and the "sandwich" confinement structure is achieved by the use of a linear-trap liquid crystal (LC) line defect and laser tweezers that "push" the sandwich together. This arrangement allows for the study of exciton-plasmon interactions in a single structure, unaltered by ensemble effects or the complexity of dielectric interfaces. We demonstrate the effect of plasmonic confinement on the photon antibunching behavior of the QD and its luminescence lifetime. The QD behaves as a single emitter when nanorods are far away from the QD but shows possible multiexciton emission and a significantly decreased lifetime when tightly confined in a plasmonic "sandwich". These findings demonstrate that LC defects, combined with laser tweezers, enable a versatile platform to study plasmonic coupling phenomena in a nanoscale laboratory, where all elements can be arranged almost at will.

Original languageAmerican English
Pages (from-to)2580-2590
Number of pages11
JournalACS Nano
Issue number3
StatePublished - 27 Mar 2018

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-68952


  • antibunching
  • disclination
  • liquid crystals
  • metal nanoparticles
  • Plasmonics
  • semiconductor nanocrystals


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