Abstract
Colloidal quantum dot (CQD) assemblies exhibit interesting optoelectronic properties when coupled to optical resonators ranging from Purcell-enhanced emission to the emergence of hybrid electronic and photonic polariton states in the weak and strong coupling limits, respectively. Here, experiments exploring the weak-to-strong coupling transition in CQD-plasmonic lattice hybrid devices at room temperature are presented for varying CQD concentrations. To interpret these results, generalized retarded Fano-Anderson and effective medium models are developed. Individual CQDs are found to interact locally with the lattice yielding Purcell-enhanced emission. At high CQD densities, polariton states emerge as two-peak structures in the photoluminescence, with a third polariton peak, due to collective CQD emission, appearing at still higher CQD concentrations. Our results demonstrate that CQD-lattice plasmon devices represent a highly flexible platform for the manipulation of collective spontaneous emission using lattice plasmons, which could find applications in optoelectronics, ultrafast optical switches, and quantum information science.
Original language | English (US) |
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Pages (from-to) | 7347-7357 |
Number of pages | 11 |
Journal | ACS nano |
Volume | 14 |
Issue number | 6 |
DOIs | |
State | Published - Jun 23 2020 |
Funding
The authors acknowledge the Indo-U.S. Science Technology Forum (IUSSTF) for funding through a virtual centre on quantum plasmonics. The authors acknowledge DST Nanomission, India, for funding. G.C.S. and C.C. were supported by NSF Grant CHE-1760537 (theory development), and G.C.S., M.B., and T.O. were supported by NSF Grant DMR-1904385 (theory applications and laser research). This work utilized the Northwestern University Micro/Nano Fabrication Facility (NUFAB), which is partially supported by Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205), the Materials Research Science and Engineering Center (DMR-1720139), the State of Illinois, and Northwestern University. This research was supported in part by the Quest high performance computing facility at Northwestern University, which is jointly supported by the Office of the Provost, the Office for Research, and Northwestern University Information Technology.
Keywords
- Purcell factor
- lattice plasmons
- polariton
- quantum dot
- strong coupling
- surface lattice resonances
ASJC Scopus subject areas
- General Materials Science
- General Engineering
- General Physics and Astronomy