Mid Infrared Mapping of Four-Layer Graphene Polytypes using Near-Field Microscopy

Daniel Beitner, Shaked Amitay, Simon Salleh Atri, Andrew Mcellistrim, Tom Coen, Vladimir I. Fal'ko, Shachar Richter, Moshe Ben Shalom, Haim Suchowski

Research output: Contribution to journalArticlepeer-review


The mid-infrared (MIR) spectral region attracts attention for accurate chemical analysis using photonic devices. Few-layer Graphene (FLG) polytypes are promising platforms due to their broad absorption in this range and gate-tunable optical properties. Among these polytypes, the noncentrosymmetric ABCB/ACAB structure is particularly interesting due to its intrinsic bandgap (8.8 meV) and internal polarization. In this study, we utilize scattering-scanning near-field microscopy to measure the optical response of all three tetralayer Graphene polytypes in the 8.5-11.5 µm range. We employ a finite dipole model to compare these results to the calculated optical conductivity for each polytype obtained from a tight-binding model. Our findings reveal a significant discrepancy in the MIR optical conductivity response of Graphene between the different polytypes than what the tight-binding model suggests. This observation implies an increased potential for utilizing the distinct tetralayer polytypes in photonic devices operating within the mid-infrared range for chemical sensing and IR imaging.
Original languageEnglish
JournalNano Letters
Publication statusPublished - 26 Nov 2023


  • Few-Layer Graphene
  • Raman Spectroscopy
  • Mid-Ir Nano-Imaging
  • Stacking Order
  • Scanning Near-Field Optical Microscopy
  • Optical Conductivity
  • Rhombohedral
  • Bernal


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