期刊
ACS NANO
卷 14, 期 6, 页码 7347-7357出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c02785
关键词
quantum dot; surface lattice resonances; lattice plasmons; strong coupling; Purcell factor; polariton
类别
资金
- Indo-U.S. Science Technology Forum (IUSSTF) through a virtual centre on quantum plasmonics
- DST Nanomission, India
- NSF [CHE-1760537, DMR-1904385]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF ECCS-1542205]
- Materials Research Science and Engineering Center [DMR-1720139]
- State of Illinois
- Northwestern University
- Office of the Provost
- Office for Research
- Northwestern University Information Technology
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.
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