Hyperspectral mapping of anisotropy. Issue 6 (13th August 2019)

• Record Type: Journal Article
• Authors: Ryu, Meguya; Honda, Reo; Balčytis, Armandas; Vongsvivut, Jitraporn; Tobin, Mark J.; Juodkazis, Saulius; Morikawa, Junko
• Is Part Of: Nanoscale horizons. Volume 4:Issue 6(2019)
• Page Start: 1443
• Page End: 1449
• Publication Date: 2019-08-13
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nh00340a
• Languages: English
• ISSNs: 2055-6756

Abstract

Abstract : Hyperspectral imaging is now augmented by separation of the birefringence, dichroism and orientation function at the same wavelength and pixel by combining Malus and Beer–Lambert laws. 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 ∼Δ n and ∼Δ κ 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 Δ n and Δ κ on the sample orientation angle. It has potential applications in analytical science, multi-dimensional optical memory devices, and forensic/defense/sensor fields.