Doping-driven topological polaritons in graphene/α-MoO3 heterostructures
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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2022-09
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en
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Nature Nanotechnology
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Control over charge carrier density provides an efficient way to trigger phase transitions and modulate the optoelectronic properties of materials. This approach can also be used to induce topological transitions in the optical response of photonic systems. Here we report a topological transition in the isofrequency dispersion contours of hybrid polaritons supported by a two-dimensional heterostructure consisting of graphene and α-phase molybdenum trioxide. By chemically changing the doping level of graphene, we observed that the topology of polariton isofrequency surfaces transforms from open to closed shapes as a result of doping-dependent polariton hybridization. Moreover, when the substrate was changed, the dispersion contour became dominated by flat profiles at the topological transition, thus supporting tunable diffractionless polariton propagation and providing local control over the optical contour topology. We achieved subwavelength focusing of polaritons down to 4.8% of the free-space light wavelength by using a 1.5-μm-wide silica substrate as an in-plane lens. Our findings could lead to on-chip applications in nanoimaging, optical sensing and manipulation of energy transfer at the nanoscale.Description
Funding Information: We acknowledge P. Alonso-González and J. Duan (Departamento de Física, Universidad de Oviedo) for valuable discussions and constructive comments. This work was supported by the National Key Research and Development Program of China (grant no. 2021YFA1201500, to Q.D.; 2020YFB2205701, to H.H.), the National Natural Science Foundation of China (grant nos. 51902065, 52172139 to H.H.; 51925203, U2032206, 52072083 and 51972072, to Q.D.), Beijing Municipal Natural Science Foundation (grant no. 2202062, to H.H.) and the Strategic Priority Research Program of Chinese Academy of Sciences (grant nos. XDB30020100 and XDB30000000, to Q.D.). F.J.G.d.A. acknowledges the ERC (Advanced grant no. 789104-eNANO), the Spanish MICINN (PID2020-112625GB-I00 and SEV2015-0522) and the CAS President’s International Fellowship Initiative for 2021. S.F. acknowledges the support of the US Department of Energy (grant no. DE-FG02-07ER46426). Z.S. acknowledges the Academy of Finland (grant nos. 314810, 333982, 336144 and 336818), The Business Finland (ALDEL), the Academy of Finland Flagship Programme (320167, PREIN), the European Union’s Horizon 2020 research and innovation program (820423, S2QUIP and 965124, FEMTOCHIP), the EU H2020-MSCA-RISE-872049 (IPN-Bio) and the ERC (834742). P.L. acknowledges the National Natural Science Foundation of China (grant no. 62075070). | openaire: EC/H2020/820423/EU//S2QUIP | openaire: EC/H2020/834742/EU//ATOP | openaire: EC/H2020/965124/EU//FEMTOCHIP
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Hu, H, Chen, N, Teng, H, Yu, R, Qu, Y, Sun, J, Xue, M, Hu, D, Wu, B, Li, C, Chen, J, Liu, M, Sun, Z, Liu, Y, Li, P, Fan, S, García de Abajo, F J & Dai, Q 2022, ' Doping-driven topological polaritons in graphene/α-MoO 3 heterostructures ', Nature Nanotechnology, vol. 17, no. 9, ARTN s41565-022-01185-2, pp. 940-946 . https://doi.org/10.1038/s41565-022-01185-2