Science Advances

Supplementary Materials

The PDF file includes:

  • Note S1. Theoretical model for calculating the isofrequency surface of the PhPs
  • Note S2. Simulation of the dipole-launched PhP waves on the α-MoO3 surface
  • Note S3. Simulation of the nanoantenna launched PhPs on the α-MoO3
  • Note S4. Determination of the crystalline direction of a typical α-MoO3 flake
  • Note S5. Simulation of the s-SNOM image using the phenomenological cavity model
  • Note S6. Calculations on the complex reflectivity of the multilayer structure α-MoO3/SiO2
  • Fig. S1. Schematic showing the isofrequency curves of the PhPs in the biaxial α-MoO3 flake.
  • Fig. S2. Simulations of the dipole-launched hyperbolic PhPs on the α-MoO3 surface.
  • Fig. S3. Propagation directions of the in-plane hyperbolic PhPs.
  • Fig. S4. Silver nanoantenna-launched PhPs at various incidence frequencies.
  • Fig. S5. Determination of the crystalline directions of the α-MoO3 by Raman spectroscopy.
  • Fig. S6. Near-field optical images showing in-plane anisotropic PhPs characteristics of the α-MoO3.
  • Fig. S7. Comparison of the experiment and simulation near-field images of the PhPs distributions illuminated by 986 cm−1 (Band 3).
  • Fig. S8. Scheme of the multi-layered structure consisted of air/α-MoO3/SiO2.
  • Fig. S9. Optical image of the α-MoO3 flake used for conducting the hyperspectral PiFM movies.
  • Legends for movies S1 and S2.
  • Table S1. Parameters used in calculating the relative permittivities (Eq. S1).

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Other Supplementary Material for this manuscript includes the following:

  • Movie S1 (.mp4 format). Hyperspectral PiFM movie of the edge perpendicular to the 100 direction, which is adjacent to the corner 1 shown in fig. S9.
  • Movie S2 (.mp4 format). Hyperspectral PiFM movie of the edge perpendicular to the 001 direction, which is in proximity of the corner 1 shown in fig. S9.

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