Volume 10, Issue 2
January 18, 2022
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Plasmonics on a Neural Implant: Engineering Light–Matter Interactions on the Nonplanar Surface of Tapered Optical Fibers (Advanced Optical Materials 2/2022)
Filippo Pisano, Muhammad Fayyaz Kashif, Antonio Balena, Marco Pisanello, Francesco De Angelis, Liset M de la Prida, Manuel Valiente, Antonella D'Orazio, Massimo De Vittorio, Marco Grande, Ferruccio Pisanello
2270005 First Published: 18 January 2022

In article number 2101649, Filippo Pisano and co-workers demonstrate a first step towards implantable multimodal plasmonic neural interfaces. This was achieved by integrating highly-curved plasmonic nanostructures on a tapered optical fiber in order to engineer the spectral and angular patterns of optical emission and collection, with applications to fluorescence and Raman spectroscopy. [Cover image: artwork by Antonio Balena.]

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Inside Front Cover
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Doping Concentration Influenced Pyro-Phototronic Effect in Self-Powered Photodetector Based on Ga-Incorporated ZnO Microwire/p+-GaN Heterojunction (Advanced Optical Materials 2/2022)
Peng Wan, Mingming Jiang, Tong Xu, Yang Liu, Xiaosheng Fang, Caixia Kan
2270006 First Published: 18 January 2022

The influence of the pyro-phototronic effect on a self-powered photodetector, composed of Ga-incorporated ZnO microwire (ZnO:Ga MW) and p+-GaN layer, was studied systematically by Mingming Jiang, Xiaosheng Fang, Caixia Kan, and co-workers (see article number 2101851). Varying the Ga-doping concentration in ZnO:Ga MWs, the pyroelectric current and photovoltaic current of photodetectors can be tuned, and the variation is attributed to the increased rate of photogenerated temperature and narrowed depletion layer.

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Back Cover
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Dynamic Quarter-Wave Metasurface for Efficient Helicity Inversion of Polarization Beyond the Single-Layer Conversion Limit (Advanced Optical Materials 2/2022)
Mitsuki Kobachi, Fumiaki Miyamaru, Toshihiro Nakanishi, Kunio Okimura, Atsushi Sanada, Yosuke Nakata
2270008 First Published: 18 January 2022

The metasurface on the back cover (see article number 2101615 by Yosuke Nakata and co-workers) efficiently converts an incident wave with linear polarization (green) into a reflected one with circular polarization (red/blue). Depending on the connection state (represented by red/blue) of the metallic pattern, the rotation direction of circular polarization is switched. The dynamic control of the connection state is realized by leveraging vanadium dioxide. The device is applicable to highly sensitive terahertz detection of chiral molecules that respond differently depending on the handedness of the circular polarization.

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