Science Advances

Supplementary Materials

This PDF file includes:

  • Supplementary Method 1. Separation of s-SNOM contributions
  • Supplementary Method 2. Effective index, electric field profile, and anisotropy calculations
  • Fig. S1. Optical and Raman characterization.
  • Fig. S2. Microscope imaging using polarized light.
  • Fig. S3. AFM characterization.
  • Fig. S4. Raw s-SNOM scans.
  • Fig. S5. Component separation.
  • Fig. S6. s-SNOM images of the real part of the roundtrip contribution at different pseudo-heterodyne harmonics.
  • Fig. S7. Three-layer heterostructures.
  • Fig. S8. Calculated in-plane anisotropy values of the phonon polaritons for varying thickness of h-BN in the h-BN/BP heterostructure.
  • Fig. S9. Calculated effective indices for a range of refractive indices of BP.

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