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Greatly enhanced electric field by the improved metal-insulator-metal structure in the visible region
Shiwei Shu1,2, Chengping Huang3, Meng Zhang1
1College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, People's Republic of China.
Abstract:
We report a study on the introduction of the coupling effect of nanostructures into the metal-insulator-metal (MIM) based absorber to enhance the intensity of incident optical signal. A system including square-shaped holes with an embedded gold nanorods structure is elaborately designed and integrated into the MIM based absorber. Through the fine-tuning of size, shape and material inside the system, a strong coupling effect is formed among the void plasmons resonance mode of nanoholes, the localized surface plasmons resonance mode of nanorods and the Fabry-Perot resonance of the middle layer cavity. And the maximum strength of electric field intensity is enhanced to 4000 times at 'hotspots' in the visible region. The proposed absorber here can realize an enhanced coupling effect as well as keep the high absorption efficiency, showing a great application potential in the field of effective optical signal amplification.
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