Magnetic plasmon induced transparency in three-dimensional metamolecules

Nanophotonics

article

Pin Chieh Wu¹  Wei Ting Chen¹  Kuang-Yu Yang¹  Chih Ting Hsiao²  Greg Sun³  Ai Qun Liu⁴  Nikolay I. Zheludev⁵  Din Ping Tsai¹ 

[1] Graduate Institute of Applied Physics, National Taiwan University;Department of Physics, National Taiwan University;Department of Physics, University of Massachusetts Boston;School of Electrical and Electronic Engineering, Nanyang Technological University;Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton;2 Department of Physics, National Taiwan University;Research Center for Applied Sciences

关键词: metamaterials;    plasmon induced transparency;    magnetic resonance;   

DOI  :  10.1515/nanoph-2012-0019

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

In a laser-driven atomic quantum system, a continuous state couples to a discrete state resulting in quantum interference that provides a transmission peak within a broad absorption profile the so-called electromagnetically induced transparency (EIT). In the field of plasmonic metamaterials, the sub-wavelength metallic structures play a role similar to atoms in nature. The interference of their near-field coupling at plasmonic resonance leads to a plasmon induced transparency (PIT) that is analogous to the EIT of atomic systems. A sensitive control of the PIT is crucial to a range of potential applications such as slowing light and biosensor. So far, the PIT phenomena often arise from the electric resonance, such as an electric dipole state coupled to an electric quadrupole state. Here we report the first three-dimensional photonic metamaterial consisting of an array of erected U-shape plasmonic gold nanostructures that exhibits PIT phenomenon with magnetic dipolar interaction between magnetic metamolecules. We further demonstrate using a numerical simulation that the coupling between the different excited pathways at an intermediate resonant wavelength allows for a π phase shift resulting in a destructive interference. A classical RLC circuit was also proposed to explain the coupling effects between the bright and dark modes of EIT-like electromagnetic spectra. This work paves a promising approach to achieve magnetic plasmon devices.

【 授权许可】

CC BY