Abstract
A high Q-value reflective type metasurface consisting of 1D Au nanorods, a SiO2 spacer and a Au back reflector is demonstrated. It is shown that the sideband of the resonant mode can be suppressed as the resonant wavelength close to the phonon absorption of SiO2. By combining both designed structured resonance and inherent property of the based materials, a low angle-dependent metasurface with a Q-value of 40 has been demonstrated. The proposed structure will be useful for high sensitivity sensing and narrow band thermal emitter.
Highlights
Metamaterials, with functional electromagnetic behaviors on demand, are typically engineered by arranging a set of arbitrary designed structures in a regular array throughout a region of space[1,2,3]
We demonstrate a magnetically resonant metasurface with a high Q-value combining both designed structured resonance and inherent property of the based materials
The structure consists of a SiO2 spacer layer sandwiched by Au nanorod array and Au thin film
Summary
Metamaterials, with functional electromagnetic behaviors on demand, are typically engineered by arranging a set of arbitrary designed structures in a regular array throughout a region of space[1,2,3]. The widely investigated split ring resonator (SRR) based designs show a strong angular dependence[28], as the transmission properties of these structures rely in part on a coupling with a surface electromagnetic wave. This kind of structure is usually with low quality factors due to the symmetry and inherent loss of utilized material[29,30]. We demonstrate a magnetically resonant metasurface with a high Q-value combining both designed structured resonance and inherent property of the based materials. The proposed structure will be useful for high sensitivity sensing and narrow band thermal emitter
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