Spontaneous emission dynamics of Eu3+ ions coupled to hyperbolic metamaterials

López-Morales, Gabriel I.; Li, Mingxing; Yadav, Ravindra K.; Kalluru, Harshavardhan R.; Basu, Jaydeep K.; Meriles, Carlos A.; Menon, Vinod M.

doi:10.1063/5.0032529

Spontaneous emission dynamics of Eu³⁺ ions coupled to hyperbolic metamaterials

Journal Article · Tue Jan 05 00:00:00 EST 2021 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0032529· OSTI ID:1853651

^[1]; Li, Mingxing ^[2]; Yadav, Ravindra K. ^[3]; ^[3]; Basu, Jaydeep K. ^[3]; ^[2]; ^[2]

City College of the City University of New York, New York, NY (United States); City Univ. of New York, NY (United States)
City College of the City University of New York, New York, NY (United States)
Indian Inst. of Science, Bangalore (India)

We show that sub-wavelength nanostructured systems with tunable electromagnetic properties, such as hyperbolic metamaterials (HMMs), provide a useful platform to tailor spontaneous emission processes. Here, we investigate a system comprising Eu³⁺(NO₃)₃·6H₂O nanocrystals on an HMM structure featuring a hexagonal array of Ag nanowires in a porous Al2O₃ matrix. The HMM-coupled Eu³⁺ ions exhibit up to a 2.4 fold increase in their decay rate, accompanied by an enhancement of the emission rate of the ⁵D₀ → ⁷F₂ transition. Using finite-difference time-domain modeling, we corroborate these observations with the increase in the photonic density of states seen by the Eu³⁺ ions in the proximity of the HMM. Our results indicate that HMMs can serve as a valuable tool to control the emission from weak transitions and, hence, hint at a route toward more practical applications of rare-earth ions in nanoscale optoelectronics and quantum devices.

View Accepted Manuscript (DOE)

Research Organization:: City Univ. of New York (CUNY), NY (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0020638

OSTI ID:: 1853651

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 1 Vol. 118; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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