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Issue 6, 2019
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Hyperspectral mapping of anisotropy

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Anisotropy of absorbance (dichroism) and birefringence limits spatial resolution, sensitivity during quantitative detection of trace analytes, as well as spectral imaging in the near-IR and mid-IR spectral ranges. Here we show hyperspectral imaging capable of determining retardance and absorbance due to small changes in the real and imaginary parts of the refractive index ∼Δn and ∼Δκ at each single point of a measurement at diffraction limited resolution. This single-beam technique allows the retrieval of the phase and amplitude information by virtue of a twice different angular dependence of Δn and Δκ on the sample orientation angle. It has potential applications in analytical science, multi-dimensional optical memory devices, and forensic/defense/sensor fields.

Graphical abstract: Hyperspectral mapping of anisotropy

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The article was received on 22 May 2019, accepted on 23 Jul 2019 and first published on 23 Jul 2019

Article type: Communication
DOI: 10.1039/C9NH00340A
Nanoscale Horiz., 2019,4, 1443-1449

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    Hyperspectral mapping of anisotropy

    M. Ryu, R. Honda, A. Balčytis, J. Vongsvivut, M. J. Tobin, S. Juodkazis and J. Morikawa, Nanoscale Horiz., 2019, 4, 1443
    DOI: 10.1039/C9NH00340A

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