Polarimetry with Disordered Photonic Structures

• Published in: ACS Photonics
• Main Authors: Juhl, Michael, Leosson, Kristjan
• Other Authors: Raunvísindastofnun (HÍ), Science Institute (UI), Verkfræði- og náttúruvísindasvið (HÍ), School of Engineering and Natural Sciences (UI), Háskóli Íslands, University of Iceland
• Format: Article in Journal/Newspaper
• Language: English
• Published: American Chemical Society (ACS) 2019
• Subjects: Skautun (rafsegulfræði); Vélrænt nám; Polarimetry; Polarization selective devices; Nanophotonics; Nanótækni; Deep neural networks; Machine learning; Mueller; Rubin; Iceland
• Online Access: https://hdl.handle.net/20.500.11815/3297; https://doi.org/10.1021/acsphotonics.9b01420

Post-print (lokagerð höfundar) In conventional Stokes polarimetry, where the polarimetric information is obtained from a series of intensity measurements, stable and accurate measurements typically require the optical elements to be carefully designed. Here, we propose a paradigm shift where deep neural network assisted polarimeters based on disordered photonic structures perform high quality polarimetric measurements while completely removing the need for specially designed polarization analyzers, demonstrating how disordered photonic structures fabricated without the use of any nanolithography techniques can enable accurate analysis of optical signals. We implement this concept with disorder- engineered nano-scatterers that allow for analyzing varying degrees of disorder and cellophane film that demonstrate the cost-saving potential of the concept. We demonstrate polarimetric performances, calibrated using deep neural networks, that are comparable to commercial polarimeters, does not require prior knowledge of the input wavelength and show a high degree of mechanical stability. This work was supported in part by the Icelandic Research Fund under Grant 187043-0611 and in part by the Air Force O ce for Scienti c Research under MURI Grant FA9550-14-1-0389. The authors thank J.P. Balthasar Mueller, Einar B. Magnusson and Noah Rubin for valuable help and advice. The processing of gold metasurfaces was performed at the nanofabrication facility at the University of Iceland. Peer Reviewed