Electromagnetic enhancement by a single nano-groove in metallic substrate.
We propose systematic investigations of the electromagnetic enhancement by a single nano-groove in gold substrate. The impacts of the groove parameters and of the illumination conditions on the enhanced intensity are explored using a fully vectorial numerical method. The obtained data can be well predicted and explained by a simple Fabry-Perot model. By virtue of the semi-analytical model, we identify two main factors that enable giant electric-field enhancement in very narrow grooves: the Fabry-Perot resonance and the large wave impedance of the fundamental mode in the groove.
Zhang
Siwen
S
Key Laboratory of Opto-electronic Information Science and Technology, Ministry of Education,Institute of Modern Optics, Nankai University, Tianjin 300071, China.
Liu
Haitao
H
Mu
Guoguang
G