光子-表面等离激元复合纳米线激光器-Letter.PDF

Letter /NanoLett Hybrid Photon-Plasmon Nanowire Lasers Xiaoqin Wu,†,§ Yao Xiao,†,§ Chao Meng,† Xining Zhang,† Shaoliang Yu,† Yipei Wang,† Chuanxi Yang,† Xin Guo,† C. Z. Ning,‡ and Limin Tong*,† †State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China ‡School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287, United States S *Supporting Information ABSTRACT: Metallic and plasmonic nanolasers have attracted growing interest recently. Plasmonic lasers demonstrated so far operate in hybrid photon-plasmon modes in transverse dimensions, rendering it impossible to separate photonic from plasmonic components. Thus only the far-field photonic component can be measured and utilized directly. But spatially separated plasmon modes are highly desired for applications including high-efficiency coupling of single-photon emitters and ultrasensitivity optical sensing. Here, we report a nanowire (NW) laser that offers subdiffraction-limited beam size and spatially separated plasmon cavity modes. By near-field coupling a high-gain CdSe NW and a 100 nm diameter Ag NW, we demonstrate a hybrid photon-plasmon laser operating at 723 nm wavelength at room temperature, with a plasmon mode area of 0.008λ2. This device simultaneously provides spatially separated photonic far-field output and highly localized coherent plasmon modes, which may open up new avenues in the fields of integrated nanophotonic circuits, biosensing, and quantum information