Issue 6, 2019

Hyperspectral mapping of anisotropy

Abstract

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

Supplementary files

Article information

Article type
Communication
Submitted
22 May 2019
Accepted
23 Jul 2019
First published
23 Jul 2019

Nanoscale Horiz., 2019,4, 1443-1449

Author version available

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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