Im Song-Jin, Ho Gum-Song, Yang Da-Jie, Hao Zhong-Hua, Zhou Li, Kim Nam-Chol, Kim Il-Gwang, Wang Qu-Quan
Department of Physics, Kim Il Sung University, Pyongyang, Democratic People's Republic of Korea.
School of Physics and Technology, Wuhan University, Wuhan 430072, People's Republic of China.
Sci Rep. 2016 Jan 6;6:18660. doi: 10.1038/srep18660.
We present that surface plasmon polariton, side-coupled to a gain-assisted nanoresonator where the absorption is overcompensated, exhibits a prominent phase shift up to π maintaining the flat unity transmission across the whole broad spectra. Bandwidth of this plasmonic phase shift can be controlled by adjusting the distance between the plasmonic waveguide and the nanoresonator. For a moderate distance, within bandwidth of 100 GHz, the phase shift and transmission are constantly maintained. The plasmonic phase can be shift-keying-modulated by a pumping signal in the gain-assisted nanoresonator. A needed length in our approach is of nanoscale while already suggested types of plasmonic phase modulator are of micrometer scale in length. The energy consumption per bit, which benefits from the nano size of this device, is ideally low on the order of 10 fJ/bit. The controllable plasmonic phase shift can find applications in nanoscale Mach-Zehnder interferometers and other phase-sensitive devices as well as directly in plasmonic phase shift keying modulators.
我们展示了与增益辅助纳米谐振器侧面耦合的表面等离激元极化激元，在该纳米谐振器中吸收被过度补偿，它表现出高达π的显著相移，并且在整个宽光谱范围内保持平坦的单位传输率。这种等离子体相移的带宽可以通过调整等离子体波导与纳米谐振器之间的距离来控制。对于中等距离，在100 GHz的带宽内，相移和传输率能持续保持。等离子体相可以通过增益辅助纳米谐振器中的泵浦信号进行移相键控调制。我们方法中所需的长度为纳米级，而已提出的等离子体相位调制器类型的长度为微米级。得益于该器件的纳米尺寸，每位的能耗理想情况下很低，约为10 fJ/bit。可控的等离子体相移可应用于纳米级马赫-曾德尔干涉仪和其他相敏器件，以及直接应用于等离子体相移键控调制器。
