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  1. Fano Resonances in Ultracompact Silicon-on-Insulator Compatible Integrated Photonic–Plasmonic Hybrid Circuits

    Zhipeng Qi, Guohua Hu, Pengfei Zheng, Ruigong Su, Wenhua Shi, Binfeng Yun, Ruohu Zhang and Yiping Cui

    Version of Record online: 20 NOV 2017 | DOI: 10.1002/adom.201700304

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    An integrated Fano device based on an silicon-on-insulator compatible photonic–plasmonic hybrid circuit is presented, which mainly consists of an ultracompact plasmonic nanocavity and two Si nanowire waveguides. A controllable Fano resonance is realized in this circuit, which can be explained by three coupled oscillators model. This device may find utility in optical communications, buffering, and sensing.

  2. 2D Nonlayered Selenium Nanosheets: Facile Synthesis, Photoluminescence, and Ultrafast Photonics

    Chenyang Xing, Zhongjian Xie, Zhiming Liang, Weiyuan Liang, Taojian Fan, Joice Sophia Ponraj, Sathish Chander Dhanabalan, Dianyuan Fan and Han Zhang

    Version of Record online: 20 NOV 2017 | DOI: 10.1002/adom.201700884

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    In this work, 2D nonlayered selenium nanosheets are fabricated by virtue of the anisotropy of bulk Se itself and probe-sonication liquid-phase exfoliation. The morphology, band gap, optical absorption, crystalline phase, and chemical stability are investigated. Based on these characterizations, the 2D Se nanosheets are realized for ultrafast photonics, and their performance is evaluated.

  3. Through the Spherical Looking-Glass: Asymmetry Enables Multicolored Internal Reflection in Cholesteric Liquid Crystal Shells

    Yong Geng, Ju-Hyun Jang, Kyung-Gyu Noh, JungHyun Noh, Jan P. F. Lagerwall and Soo-Young Park

    Version of Record online: 20 NOV 2017 | DOI: 10.1002/adom.201700923

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    Shells of cholesteric liquid crystal can exhibit colorful rings from internal selective reflection. The shell must be thinner at the top than at the bottom, as promoted by buoyancy if the internal liquid has lower density than the liquid crystal. However, such asymmetry is counteracted by the elasticity of the helix, which favors uniform shell thickness.

  4. Strong Coupling in a Photonic Molecule Formed by Trapping a Microsphere in a Microtube Cavity

    Jiawei Wang, Yin Yin, Qi Hao, Yang Zhang, Libo Ma and Oliver G. Schmidt

    Version of Record online: 20 NOV 2017 | DOI: 10.1002/adom.201700842

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    A photonic molecule formed by trapping a microsphere into a hollow-core microtube cavity is demonstrated. Whispering gallery mode coupling between two size-mismatched cavities leads to a periodical spectral modulation. The coupling strength can be readily tuned by shifting the excitation position along the tube axial dimension. Mode splitting and anti­crossing feature are observed for inter­actions in the strong coupling regime.

  5. Amplitude Modulation of Anomalously Refracted Terahertz Waves with Gated-Graphene Metasurfaces

    Teun-Teun Kim, Hyunjun Kim, Mitchell Kenney, Hyun Sung Park, Hyeon-Don Kim, Bumki Min and Shuang Zhang

    Version of Record online: 20 NOV 2017 | DOI: 10.1002/adom.201700507

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    Electric control of anomalously-refracted waves is demonstrated in a hybrid graphene/metasurface system. Combining two-dimensional apertures based on a concept of Pancharatnam–Berry phase and single-layer graphene, it is shown that the amplitude of anomalously refracted circularly cross-polarized waves can be effectively modulated to a low gate-voltage (< 2.2 V).

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