Deep subwavelength topological edge state in a hyperbolic medium.

Autor: Orsini L; ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Spain., Herzig Sheinfux H; ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Spain.; Physics Department, Bar Ilan University, Ramat Gan, Israel., Li Y; School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA., Lee S; School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA.; Department of Physics, Korea University, Seoul, Republic of Korea., Andolina GM; JEIP, USR 3573 CNRS, Collège de France, PSL Research University, Paris, France., Scarlatella O; Cavendish Laboratory, University of Cambridge, Cambridge, UK., Ceccanti M; ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Spain., Soundarapandian K; ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Spain., Janzen E; Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, KS, USA., Edgar JH; Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, KS, USA., Shvets G; School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA., Koppens FHL; ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Spain. frank.koppens@icfo.eu.; Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain. frank.koppens@icfo.eu.
Jazyk: angličtina
Zdroj: Nature nanotechnology [Nat Nanotechnol] 2024 Oct; Vol. 19 (10), pp. 1485-1490. Date of Electronic Publication: 2024 Aug 01.
DOI: 10.1038/s41565-024-01737-8
Abstrakt: Topological photonics offers the opportunity to control light propagation in a way that is robust from fabrication disorders and imperfections. However, experimental demonstrations have remained on the order of the vacuum wavelength. Theoretical proposals have shown topological edge states that can propagate robustly while embracing deep subwavelength confinement that defies diffraction limits. Here we show the experimental proof of these deep subwavelength topological edge states by implementing periodic modulation of hyperbolic phonon polaritons within a van der Waals heterostructure composed of isotopically pure hexagonal boron nitride flakes on patterned gold films. The topological edge state is confined in a subdiffraction volume of 0.021 µm 3 , which is four orders of magnitude smaller than the free-space excitation wavelength volume used to probe the system, while maintaining the resonance quality factor above 100. This finding can be directly extended to and hybridized with other van der Waals materials to broadened operational frequency ranges, streamline integration of diverse polaritonic materials, and compatibility with electronic and excitonic systems.
(© 2024. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
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