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. 2016 Nov 22;7:13590. doi: 10.1038/ncomms13590

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Copyright © 2016, The Author(s)

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(a) Measured (upper panel) and modelled (lower panel) reflection spectra close to the transverse optical (TO) phonon energy in hBN. The broader measured resonance width stems from the Fourier transform infrared (FTIR) reflecting objective that provides a range of incidence/measurement angles simultaneously (θ=12–24°) compared with the modelled θ=15°. (b) The air gap is significantly smaller than the mid-IR wavelengths; however, close to the TO phonon energy, light is highly compressed within the hBN because of its large index of refraction.