由于硅对太赫兹的调制效果较差,所以从理论上和实验上研究了基于硅基等离子诱导透明(PIT)超表面的太赫兹调制器。研究结果发现在透射光谱中可以观察到明显的透明窗口,该透明窗口是由2个谐振器之间的近场耦合引起的。实验结果表明,随着...由于硅对太赫兹的调制效果较差,所以从理论上和实验上研究了基于硅基等离子诱导透明(PIT)超表面的太赫兹调制器。研究结果发现在透射光谱中可以观察到明显的透明窗口,该透明窗口是由2个谐振器之间的近场耦合引起的。实验结果表明,随着泵浦光功率的增加,透明窗口出现了蓝移。当光泵功率从0 m W增加到700 m W时,0.70 THz处的振幅调制深度可以达到80.75%,同时研究了它的慢光效应。设计的这种新型的超表面结构增强了硅的调制效果,提供了一种实际应用的可能。展开更多
本文提出了两种新型的基于石墨烯的表面等离子体光波导（GSPW）,结构由单层石墨烯直波导与侧耦合的石墨烯环形谐振腔和条形谐振腔构成,利用有限元法（finite element method,FEM）对GSPW中呈现出的等离子体诱导透明（plasmon induced tr...本文提出了两种新型的基于石墨烯的表面等离子体光波导（GSPW）,结构由单层石墨烯直波导与侧耦合的石墨烯环形谐振腔和条形谐振腔构成,利用有限元法（finite element method,FEM）对GSPW中呈现出的等离子体诱导透明（plasmon induced transparency,PIT）现象及其慢光效应进行了研究,结果表明,传输谱中出现的PIT透明窗口峰值传输率可达到80%以上,而其两侧的传输谷值接近于0,并且PIT峰值附近的最大群折射率在112左右,具有很好的滤波特性与慢光特性。透明窗口在不改变几何结构的情况下还可通过石墨烯化学势的改变而动态调制,因此,该结构在今后基于石墨烯的高密度集成表面等离子体光波导器件的设计中具有重要的借鉴作用。展开更多
Plasmonic waveguides that allow deeply subwavelength confinement of light provide an effective platform for the design of ultracompact photonic devices.As an important plasmonic waveguide,metal-insulator-metal(MIM)str...Plasmonic waveguides that allow deeply subwavelength confinement of light provide an effective platform for the design of ultracompact photonic devices.As an important plasmonic waveguide,metal-insulator-metal(MIM)structure supports the propagation of light in the nanoscale regime at the visible and near-infrared ranges.Here,we focus on our work in MIM plasmonic waveguide devices for manipulating light,and review some of the recent development of this topic.We introduce MIM plasmonic wavelength filtering and demultiplexing devices,and present the electromagnetic induced transparency(EIT)-like and Fano resonance effects in MIM waveguide systems.The slow-light and rainbow trapping effects are demonstrated theoretically.These results pave a way toward dynamic control of the special and useful optical responses,which actualize some new plasmonic waveguide-integrated devices such as nanoscale filters,demultiplexers,sensors,slow light waveguides,and buffers.展开更多
文摘由于硅对太赫兹的调制效果较差,所以从理论上和实验上研究了基于硅基等离子诱导透明(PIT)超表面的太赫兹调制器。研究结果发现在透射光谱中可以观察到明显的透明窗口,该透明窗口是由2个谐振器之间的近场耦合引起的。实验结果表明,随着泵浦光功率的增加,透明窗口出现了蓝移。当光泵功率从0 m W增加到700 m W时,0.70 THz处的振幅调制深度可以达到80.75%,同时研究了它的慢光效应。设计的这种新型的超表面结构增强了硅的调制效果,提供了一种实际应用的可能。
文摘本文提出了两种新型的基于石墨烯的表面等离子体光波导（GSPW）,结构由单层石墨烯直波导与侧耦合的石墨烯环形谐振腔和条形谐振腔构成,利用有限元法（finite element method,FEM）对GSPW中呈现出的等离子体诱导透明（plasmon induced transparency,PIT）现象及其慢光效应进行了研究,结果表明,传输谱中出现的PIT透明窗口峰值传输率可达到80%以上,而其两侧的传输谷值接近于0,并且PIT峰值附近的最大群折射率在112左右,具有很好的滤波特性与慢光特性。透明窗口在不改变几何结构的情况下还可通过石墨烯化学势的改变而动态调制,因此,该结构在今后基于石墨烯的高密度集成表面等离子体光波导器件的设计中具有重要的借鉴作用。
基金supported by the National Natural Science Foundation of China(10874239,10604066 and 11204368)
文摘Plasmonic waveguides that allow deeply subwavelength confinement of light provide an effective platform for the design of ultracompact photonic devices.As an important plasmonic waveguide,metal-insulator-metal(MIM)structure supports the propagation of light in the nanoscale regime at the visible and near-infrared ranges.Here,we focus on our work in MIM plasmonic waveguide devices for manipulating light,and review some of the recent development of this topic.We introduce MIM plasmonic wavelength filtering and demultiplexing devices,and present the electromagnetic induced transparency(EIT)-like and Fano resonance effects in MIM waveguide systems.The slow-light and rainbow trapping effects are demonstrated theoretically.These results pave a way toward dynamic control of the special and useful optical responses,which actualize some new plasmonic waveguide-integrated devices such as nanoscale filters,demultiplexers,sensors,slow light waveguides,and buffers.
