Nanophotonics of mid-infrared plasmon-polaritons at interfaces between metals and two-dimensional crystals
Tipo
Artigo
Data de publicação
2025
Periódico
Nanoscale
Citações (Scopus)
0
Autores
Feres F.H.
Barcelos I.D.
Bahamon D.A.
Levandoski J.E.
Mancini A.
dos Santos T.M.
Mayer R.A.
Camargo D.H.S.
Bufon C.C.B.
Cernescu A.
Maier S.A.
Freitas R.D.O.
Maia F.C.B.
Barcelos I.D.
Bahamon D.A.
Levandoski J.E.
Mancini A.
dos Santos T.M.
Mayer R.A.
Camargo D.H.S.
Bufon C.C.B.
Cernescu A.
Maier S.A.
Freitas R.D.O.
Maia F.C.B.
Orientador
Título da Revista
ISSN da Revista
Título de Volume
Membros da banca
Programa
Resumo
© 2025 The Royal Society of Chemistry.The optical response of metal/dielectric interfaces is largely influenced by surface plasmon-polariton (SPP) modes. In the mid-infrared (IR) range, SPPs can probe the inner physicochemical properties of metal/dielectric systems, including interfaces with mid-IR polaritonic 2D crystals. Using advanced nanoscopy techniques, we characterize mid-IR SPP modes at air/gold and hexagonal boron nitride (hBN) 2D crystal/gold interfaces via synchrotron infrared nanospectroscopy (SINS) and scattering-scanning near-field optical microscopy (s-SNOM) imaging. SPPs in these systems show micrometer-sized wavelengths and propagation lengths over 20 micrometers at room temperature. In hBN/Au, both SPPs and hyperbolic phonon polaritons (HPhPs) coexist, creating SPP-HPhP wave superposition. The experimental momentum and damping of the SPP waves are determined from the s-SNOM imaging and the SINS spatio-spectral linescan. Thereby, we retrieve the experimental frequency-momentum dispersion relation, presenting excellent agreement with theory. Furthermore, we characterize an anti-crossing of the SPP dispersion near the in-plane transverse optical phonon frequency of hBN, indicating that SPP modes and phonon form a coupled system interacting in the strong coupling regime. Such an interaction of SPPs with phonons can be further explored to enhance the sensibility of mid-IR nanospectroscopy techniques.
Descrição
Palavras-chave
Assuntos Scopus
2-D crystals , Microscopy imaging , Midinfrared , Optical response , Phonon polaritons , Plasmon-polaritons , Scanning near-field optical microscopy , Surface plasmon polariton modes , Surface-plasmon , Two-dimensional crystals