TY - JOUR
T1 - Light–matter coupling in large-area van der Waals superlattices
AU - Kumar, Pawan
AU - Lynch, Jason
AU - Song, Baokun
AU - Ling, Haonan
AU - Barrera, Francisco
AU - Kisslinger, Kim
AU - Zhang, Huiqin
AU - Anantharaman, Surendra B.
AU - Digani, Jagrit
AU - Zhu, Haoyue
AU - Choudhury, Tanushree H.
AU - McAleese, Clifford
AU - Wang, Xiaochen
AU - Conran, Ben R.
AU - Whear, Oliver
AU - Motala, Michael J.
AU - Snure, Michael
AU - Muratore, Christopher
AU - Redwing, Joan M.
AU - Glavin, Nicholas R.
AU - Stach, Eric A.
AU - Davoyan, Artur R.
AU - Jariwala, Deep
N1 - Funding Information:
D.J. acknowledges primary support for this work by the US Army Research Office under contract number W911NF-19-1-0109 and Air Force Office of Scientific Research (AFOSR) grant no. FA9550-21-1-0035. D.J. and J.L. also acknowledge partial support from grant nos. FA2386-20-1-4074 and FA2386-21-1-4063 and the University Research Foundation at Penn. D.J., E.A.S. and P.K. acknowledge support from the National Science Foundation (NSF) (grant no. DMR-1905853) and support from University of Pennsylvania Materials Research Science and Engineering Center (MRSEC) (grant no. DMR-1720530) in addition to usage of MRSEC supported facilities. The sample fabrication, assembly and characterization were carried out at the Singh Center for Nanotechnology at the University of Pennsylvania, which is supported by the NSF National Nanotechnology Coordinated Infrastructure Program grant no. NNCI-1542153. F.B. is supported by the Vagelos Integrated Program in Energy Research. H.Z. was supported by Vagelos Institute of Energy Science and Technology graduate fellowship. S.B.A acknowledges support from Swiss National Science Foundation Early Postdoc Mobility Program (P2ELP2_187977). A.R.D. acknowledges support of NG Next, UCLA Council on Research Faculty Research grant and the Hellman Foundation. The TMDC monolayer samples were provided by the 2D Crystal Consortium-Materials Innovation Platform (2DCC-MIP) facility at the Pennsylvania State University, which is funded by the NSF under cooperative agreement no. DMR-1539916. M.S. and N.R.G. acknowledge support from the Air Force Office of Scientific Research under award no. FA9550-19RYCOR050. This research used resources of the Center for Functional Nanomaterials, which is a US Department of Energy Office of Science User Facility, at Brookhaven National Laboratory under contract no. DE-SC0012704. We acknowledge helpful discussions on light coupling with M. W. Knight.
Publisher Copyright:
© 2021, The Author(s), under exclusive licence to Springer Nature Limited.
PY - 2022/2
Y1 - 2022/2
N2 - Two-dimensional (2D) crystals have renewed opportunities in design and assembly of artificial lattices without the constraints of epitaxy. However, the lack of thickness control in exfoliated van der Waals (vdW) layers prevents realization of repeat units with high fidelity. Recent availability of uniform, wafer-scale samples permits engineering of both electronic and optical dispersions in stacks of disparate 2D layers with multiple repeating units. Here we present optical dispersion engineering in a superlattice structure comprising alternating layers of 2D excitonic chalcogenides and dielectric insulators. By carefully designing the unit cell parameters, we demonstrate greater than 90% narrow band absorption in less than 4 nm of active layer excitonic absorber medium at room temperature, concurrently with enhanced photoluminescence in square-centimetre samples. These superlattices show evidence of strong light–matter coupling and exciton–polariton formation with geometry-tuneable coupling constants. Our results demonstrate proof of concept structures with engineered optical properties and pave the way for a broad class of scalable, designer optical metamaterials from atomically thin layers.
AB - Two-dimensional (2D) crystals have renewed opportunities in design and assembly of artificial lattices without the constraints of epitaxy. However, the lack of thickness control in exfoliated van der Waals (vdW) layers prevents realization of repeat units with high fidelity. Recent availability of uniform, wafer-scale samples permits engineering of both electronic and optical dispersions in stacks of disparate 2D layers with multiple repeating units. Here we present optical dispersion engineering in a superlattice structure comprising alternating layers of 2D excitonic chalcogenides and dielectric insulators. By carefully designing the unit cell parameters, we demonstrate greater than 90% narrow band absorption in less than 4 nm of active layer excitonic absorber medium at room temperature, concurrently with enhanced photoluminescence in square-centimetre samples. These superlattices show evidence of strong light–matter coupling and exciton–polariton formation with geometry-tuneable coupling constants. Our results demonstrate proof of concept structures with engineered optical properties and pave the way for a broad class of scalable, designer optical metamaterials from atomically thin layers.
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U2 - 10.1038/s41565-021-01023-x
DO - 10.1038/s41565-021-01023-x
M3 - Article
C2 - 34857931
AN - SCOPUS:85120627572
VL - 17
SP - 182
EP - 189
JO - Nature Nanotechnology
JF - Nature Nanotechnology
SN - 1748-3387
IS - 2
ER -