Ultranarrow Second-Harmonic Resonances in Hybrid Plasmon-Fiber Cavities Ai, Qi ; Gui, Lili ; Paone, Domenico ; Metzger, Bernd ; Mayer, Martin ; Weber, Ksenia ; Fery, Andreas ; Giessen, Harald Abstract Publication: Nano Letters Pub Date: September 2018 DOI: 10.1021/acs.nanolett.8b02005 Bibcode: 2018NanoL..18.5576A