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  1. Extraordinary THz Transmission with a Small Beam Spot: The Leaky Wave Mechanism

    Miguel Navarro-Cía, Víctor Pacheco-Peña, Sergei A. Kuznetsov and Miguel Beruete

    Version of Record online: 23 FEB 2018 | DOI: 10.1002/adom.201701312

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    Efficient extraordinary optical transmission through subwavelength apertures is the preserve of large arrays under expanded beam illumination. Recognizing the key role played by leaky waves, high transmission is obtained here with a reduced illumination spot when there is a sufficient number of lateral holes out of the illumination spot for the leaky waves to mediate. This has strong implications for applications.

  2. Tunable Antireflection Coating to Remove Index-Matching Requirement for Interference Lithography

    Daniel A. Bacon-Brown and Paul V. Braun

    Version of Record online: 23 FEB 2018 | DOI: 10.1002/adom.201701049

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    Interference fringes from backside reflections from nonindex matched substrates are eliminated in interference lithography with a tunable polymer blend antireflection coating. Periodic lattices that previously required index-matching between photoresist and substrate, such as simple cubic, can be directly fabricated on a broad range of substrates.

  3. 2.7 µm Mid-Infrared Emission in Highly Erbium-Doped Lanthanum Gallate Glasses Prepared Via an Aerodynamic Levitation Technique

    Kohei Yoshimoto, Yoshinobu Ezura, Motoi Ueda, Atsunobu Masuno and Hiroyuki Inoue

    Version of Record online: 22 FEB 2018 | DOI: 10.1002/adom.201701283

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    Intense and efficient 2.7 µm emissions are realized in Er2O3–La2O3–Ga2O3 glasses synthesized via an aerodynamic levitation technique. The emission intensity drastically increases with Er2O3 content, without serious quenching even at high concentration (up to 10 mol%). This prominent mid-infrared emission property is ascribed to low-phonon energy, low OH absorption, high branching ratio, and energy transfer upconversion at 4I13/2 level.

  4. The Crucial Role of Charge in Thermoresponsive-Polymer-Assisted Reversible Dis/Assembly of Gold Nanoparticles

    Vladimir A. Turek, Sean Cormier, Benjamin Sierra-Martin, Ulrich F. Keyser, Tao Ding and Jeremy J. Baumberg

    Version of Record online: 22 FEB 2018 | DOI: 10.1002/adom.201701270

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    The AuNPs@PNIPAM undergo assembly pathways of aggregation/migration in their hot state above 32 °C, and disassembly pathways of inflation/diffusion in their cold state. These result in large and reversible plasmon peak shifts (>50 nm). Such prominent thermoresponsive modulations happen only when there is a strong charge screening effect, and for PNIPAM chains of low molecular weight.

  5. Photomultiplication Type Organic Photodetectors with Broadband and Narrowband Response Ability

    Jianli Miao, Fujun Zhang, Mingde Du, Wenbin Wang and Ying Fang

    Version of Record online: 21 FEB 2018 | DOI: 10.1002/adom.201800001

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    Organic photodetectors (OPDs) with extraordinary structure of ITO/PFN-OX/P3HT:PTB7-Th:PC61BM (40:60:1, wt/wt/wt)/Al are successfully fabricated, demonstrating first examples of photomultiplication (PM) type OPDs with broadband and narrowband detection ability. The PM type OPDs exhibit broadband spectral response from 350 to 800 nm under forward bias and narrowband spectral response with full width half maximum of ≈40 nm under reverse bias.