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1. Validating scattering-induced (sub)millimetre disc polarization through the spectral index, wavelength-dependent polarization pattern, and polarization spectrum: the case of HD 163296

   https://doi.org/10.1093/mnras/staa1499  

   Lin, Zhe-Yu Daniel ; Li, Zhi-Yun ; Yang, Haifeng ; Looney, Leslie ; Stephens, Ian ; Hull, Charles L ( July 2020 , Monthly Notices of the Royal Astronomical Society)

   ABSTRACT A number of young circumstellar discs show strikingly ordered (sub)millimetre polarization orientations along the minor axis, which is strong evidence for polarization due to scattering by ∼0.1 mm-sized grains. To test this mechanism further, we model the ALMA dust continuum and polarization data of HD 163296 using radmc-3d. We find that scattering by grains with a maximum size of 90  μm simultaneously reproduces the polarization observed at Band 7 and the unusually low spectral index (α ∼ 1.5) between Bands 7 and 6 in the optically thick inner disc as a result of more efficient scattering at the shorter wavelength.more »The low spectral index of ∼2.5 inferred for the optically thin gaps is reproduced by the same grains, as a result of telescope beam averaging of the gaps (with an intrinsic α ∼ 4) and their adjacent optically thick rings (where α ≲ 2). The tension between the grain sizes inferred from polarization and spectral index disappears because the low α values do not require large mm-sized grains. In addition, the polarization fraction has a unique azimuthal variation: higher along the major axis than the minor axis in the gaps, but vice versa in the rings. We find a rapidly declining polarization spectrum (with p ∝ λ−3 approximately) in the gaps, which becomes flattened or even inverted towards short wavelengths in the optically thick rings. These contrasting behaviours in the rings and gaps provide further tests for scattering-induced polarization via resolved multiwavelength observations.« less
2. Implications of Pro- and Counterattitudinal Information Exposure for Affective Polarization: Partisan Media Exposure and Affective Polarization

   https://doi.org/10.1111/hcre.12028  

   Kelly Garrett, R. ; Gvirsman, Shira Dvir ; Johnson, Benjamin K. ; Tsfati, Yariv ; Neo, Rachel ; Dal, Aysenur ( July 2014 , Human Communication Research)
3. Silicon nitride polarization beam splitter based on polarization-independent MMIs and apodized Bragg gratings

   https://doi.org/10.1364/OE.420499  

   Zhan, Jiahao ; Brock, Joseph ; Veilleux, Sylvain ; Dagenais, Mario ( January 2021 , Optics Express)
4. Analysis of signal-to-noise ratio of angle of polarization and degree of polarization

   https://doi.org/10.1364/OSAC.422541  

   Chen, Yingkai ; Zhu, Zhongmin ; Liang, Zuodong ; Iannucci, Leanne E. ; Lake, Spencer P. ; Gruev, Viktor ( April 2021 , OSA Continuum)
5. Polarization grating exposure method with easily tunable period via dual rotating polarization grating masks

   https://doi.org/10.1364/JOSAB.36.000D42  

   Kim, Jihwan ; Escuti, Michael J. ( February 2019 , Journal of the Optical Society of America B)