Department of Physics, Korea University, Seoul 136-701, Republic of Korea.
Nano Lett. 2013 Feb 13;13(2):772-6. doi: 10.1021/nl3044822. Epub 2013 Jan 18.
We demonstrate the efficient integration of an electrically driven nanowire (NW) light source with a double-strip plasmonic waveguide. A top-down-fabricated GaAs NW light-emitting diode (LED) is placed between two straight gold strip waveguides with the gap distance decreasing to 30 nm at the end of the waveguide and operated by current injection through the p-contact electrode acting as a plasmonic waveguide. Measurements of polarization-resolved images and spectra show that the light emission from the NW LED was coupled to a plasmonic waveguide mode, propagated through the waveguide, and was focused onto a subwavelength-sized spot of surface plasmon polaritons at the tapered end of the waveguide. Numerical simulation agreed well with these experimental results, confirming that a symmetric plasmonic waveguide mode was excited on the top surface of the waveguide. Our demonstration of a plasmonic waveguide coupled to an electrically driven NW LED represents important progress toward further miniaturization and practical implementation of ultracompact photonic integrated circuits.
我们展示了一种高效的电驱动纳米线（NW）光源与双条等离子体波导的集成。通过自上而下的制造工艺，将一个 GaAs NW 发光二极管（LED）放置在两个直金带波导之间，在波导的末端，间隙距离减小到 30nm，通过作为等离子体波导的 p 接触电极进行电流注入来操作。偏振分辨图像和光谱的测量表明，来自 NW LED 的光发射被耦合到等离子体波导模式中，通过波导传播，并聚焦到波导锥形端的亚波长尺寸的表面等离激元极化激元点上。数值模拟与这些实验结果吻合良好，证实了在波导的上表面激发了对称的等离子体波导模式。我们展示的电驱动 NW LED 与等离子体波导的耦合代表了朝着进一步小型化和实用化超紧凑光子集成电路的重要进展。
