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Author Spotlight: Advances in Nanoscale Infrared Spectroscopy to Explore Multiphase Polymeric Systems

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

Daniel Beitner^1,2,3, Shaked Amitay³, Simon Salleh Atri³

¹Department of Materials Science and Engineering Faculty of Engineering, Tel Aviv University Ramat Aviv, Tel Aviv 69998, Israel.

|November 26, 2023

Summary

This summary is machine-generated.

Few-layer graphene polytypes show unique mid-infrared optical responses. Their distinct properties, not predicted by theory, enhance potential for chemical sensing and infrared imaging photonic devices.

Keywords:

Bernal Few-layer graphene Mid-IR nano-imaging Optical conductivity Raman spectroscopy Rhombohedral Scanning near-field optical microscopy Stacking order

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Area of Science:

Condensed matter physics
Materials science
Photonics

Background:

Mid-infrared (MIR) spectral region is crucial for chemical analysis.
Few-layer graphene (FLG) offers broad absorption and tunable optical properties in the MIR range.
Noncentrosymmetric ABCB/ACAB tetralayer graphene structures possess intrinsic bandgaps and polarization.

Purpose of the Study:

To investigate the MIR optical response of three tetralayer graphene polytypes.
To compare experimental results with theoretical predictions from a tight-binding model.
To assess the potential of these polytypes in MIR photonic devices.

Main Methods:

Scattering-scanning near-field microscopy (s-SNOM) was used to measure optical responses.
Measurements were conducted in the 8.5-11.5 μm MIR range.
A finite dipole model was employed to analyze optical conductivity, comparing it to tight-binding calculations.

Main Results:

Significant discrepancies were observed between the experimental MIR optical conductivity and theoretical predictions for different tetralayer graphene polytypes.
The experimental results indicate unique optical behaviors for each polytype not fully captured by the tight-binding model.
The study highlights differences in MIR optical conductivity among the polytypes.

Conclusions:

Tetralayer graphene polytypes exhibit distinct MIR optical properties.
The observed discrepancies suggest limitations of current theoretical models for predicting their behavior.
These unique polytypes hold significant promise for advanced photonic devices in MIR chemical sensing and infrared imaging.