首页|Developing Plasmonic Perfect thin-film absorber by studying self-similar formation to have Fano response for optical spectroscopy
Developing Plasmonic Perfect thin-film absorber by studying self-similar formation to have Fano response for optical spectroscopy
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NSTL
Elsevier
An optical absorber with Fano response is interesting for refractive index sensing based on the Plasmonic thin-film Metal-insulator-metal (MIM) structure. In this paper, a symmetrical structure with a self-similar formation to obtain a Fano response is designed. The symmetrical form of the absorber makes independent of incident wave polarization. The coupling between the central and parasitic elements provides the Fano response, and the simulations support this characteristic. This coupling converts two bright modes for each basic structure to bright and dark modes in the final structure. This structure is modified for 927 and 1127 nm, and the parametric studies are used to improve absorption up to 99% in both peaks by reducing the reflection to improve the figure of merit (FOM) of the sensor. The maximum sensitivity and FOM are obtained 285 RIU/nm and 1046 RIU-1, respectively. In addition, the circuit model analysis is used to describe the elements effect in the proposed absorber.
NSTL
Elsevier
