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).
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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