Fig. 2: Sample orientation dependent near-field spectra on bare sapphire. | Nature Communications

Fig. 2: Sample orientation dependent near-field spectra on bare sapphire.

From: Probing subwavelength in-plane anisotropy with antenna-assisted infrared nano-spectroscopy

Fig. 2

a and b θ-dependent spectra of Ssap/Sref and ϕsap−ϕref. Spectral feature (out-of-plane modes) changes at different angles are subtle. The spectra in a and b are vertically shifted for better display. c The ratio of Ssap between θ = 0° and 90° (black curve) plotted along with the ratio of FFF (far-field factor) at θ  = 0° and 90° (red dashed curve).

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