Effects of using lossy materials on the metal-insulator-metal nanostructure absorption spectrum

Ahmad Khayat Jafari; Ayrton Bernussi; Luis Grave de Peralta

doi:10.1117/12.2528013

5 September 2019 Effects of using lossy materials on the metal-insulator-metal nanostructure absorption spectrum

Ahmad Khayat Jafari, Ayrton Bernussi, Luis Grave de Peralta

Proceedings Volume 11080, Metamaterials, Metadevices, and Metasystems 2019; 1108024 (2019) https://doi.org/10.1117/12.2528013
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

Metal-insulator-metal metasurfaces (MIM-M) structures can achieve near-unity absorptance at sub-wavelength volumes. A conventional approach to tune the absorption wavelength and the bandwidth of MIM-Ms is to change the geometrical parameters of the structure. In this research, we investigate numerically a new approach to achieve enhanced absorption in MIM-Ms in the mid-infrared spectral region by using both lossy metals and a lossy dielectric. The absorption in the dielectric spacer layer is attributed to the Berreman and epsilon near-zero modes in combination with the dielectric intrinsic loss. The simulations have revealed the presence of additional absorption peaks compared with the case of lossless dielectrics. In particular, the effects of the dielectric thickness and the radiation incident angle on the absorption spectra of the proposed MIM-M structures have been investigated.

Conference Presentation

Citation Download Citation

Ahmad Khayat Jafari, Ayrton Bernussi, and Luis Grave de Peralta "Effects of using lossy materials on the metal-insulator-metal nanostructure absorption spectrum", Proc. SPIE 11080, Metamaterials, Metadevices, and Metasystems 2019, 1108024 (5 September 2019); https://doi.org/10.1117/12.2528013

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