Ultrafast Optical Nonlinearity in a Plasmonic Multi-layered Metamaterial with Antisymmetric Ring Resonator Structures
Huijun, Wu1*, MingLun, Tseng1, Jie, Chen1, Din Ping, Tsai1,2
1Department of Physics, National Taiwan University, Taipei, Taiwan
2Research Center for Applied Science, Academia Sinica, Taipei, Taiwan
* presenting author:HuiJun Wu, email:wuhuijun@ntu.edu.tw
In this presentation, we will discuss the nonlocal optical behavior of plasmonic multi-layered metamaterial with specially designed and nano-patterned antisymmetric ring resonator structures, which will enable an enhanced, ultrafast, and nonlinear optical response. We performed the transient absorption measurement to study the optical nonlinear response of the metamaetrial. The high change of transmission of this structured meta-material is due to the nonlocal nature of the plasmonic mode of the metamaterial, so that small changes in permittivity under excitation will modify the nonlocal response. The mechanism that the nonlocality enhances the nonlinear optical response of metamaterials is also discussed.

Keywords: Multi-layered Metamaterial, Transient Absorption Spectroscopy, Antisymmetric Ring Resonator