Pae Jian Yi, Medwal Rohit, Nair Radhika V, Chaurasiya Avinash, Battiato Marco, Rawat Rajdeep Singh, Matham Murukeshan Vadakke
Centre for Optical and Laser Engineering (COLE), School of Mechanical and Aerospace Engineering, Nanyang Technological University (NTU), 639798, Singapore.
Singapore Centre for 3D Printing (SC3DP), School of Mechanical and Aerospace Engineering, Nanyang Technological University (NTU), 639798 Singapore.
Nano Lett. 2020 Nov 11;20(11):8305-8311. doi: 10.1021/acs.nanolett.0c03471. Epub 2020 Oct 20.
Precise control of light is indispensable to modern optical communication devices especially as the size of such devices approaches the subwavelength scale. Plasmonic devices are suitable for the development of these optical devices due to the extreme field confinement and its ability to be controlled by tuning the carrier density at the metal/dielectric interface. Here, an electro-ionic controlled plasmonic device consisting of Au/graphene/ion-gel is demonstrated as an optical switch, where an external electric field modulates the real part of the electrical conductivity. The graphene layer enhances charge penetration and charge separation at the Au/graphene interface resulting in an increased photoinduced voltage. The ion-gel immobilized on the Au/graphene further enables the electrical tunability of plasmons which modulates the intensity of the reflected laser light. This work paves the way for developing novel plasmonic electro-optic switches for potential applications such as integrated optical devices.
对于现代光通信设备而言，精确控制光至关重要，尤其是当此类设备的尺寸接近亚波长尺度时。由于等离子体设备具有极强的场限制能力以及通过调节金属/电介质界面处的载流子密度来进行控制的能力，因此适用于这些光学设备的开发。在此，展示了一种由金/石墨烯/离子凝胶组成的电离子控制等离子体设备作为光开关，其中外部电场调制电导率的实部。石墨烯层增强了金/石墨烯界面处的电荷穿透和电荷分离，从而导致光致电压增加。固定在金/石墨烯上的离子凝胶进一步实现了等离子体的电可调性，进而调制反射激光的强度。这项工作为开发用于集成光学设备等潜在应用的新型等离子体电光开关铺平了道路。
