Wavelength-Selective Near Unity Absorber Based on Fabry-Pérot Nanoresonators

Abstract

We proposed and analyzed a planar narrow-band absorber based on a bi-layer metal/dielectric structure. The planar absorber uses the Fabry-Pérot resonance and the inherent loss of the metals, for maximum light absorption in the range of the electromagnetic spectrum visible to the near infrared. The absorption resonance peak can be shifted to other regions of the spectrum by varying the dielectric film thicknesses. It is also possible to control the absorption with the angle of incidence for TE and TM polarization modes. The high absorption (near unity) and the high tolerance to fabrication errors of the proposed absorber can be explored in a large number of optoelectronic devices.

Design of hybrid narrow-band plasmonic absorber based on chalcogenide phase change material in the infrared spectrum

“…The proposed structure exhibits high absorption in both phases (amorphous and crystalline) at different wavelength peaks (1279 nm and 1664 nm, respectively), while the planar structure (without golden squares) presents a sharp drop in absorption when the length of wave shifts to the right and in the crystalline state, the absorption decreases in the intermediate range of the analyzed spectrum, and again reaches 90% absorption at the wavelength near 1900 nm. Structures based on planar absorbers are ideal for Fabry Perot resonators 19 , 43 , 44 , where the conditions of maintaining resonance within the cavity are present. For the proposed structure in this article, cavity resonances can be obtained by using periodic array geometry.…”

Biosensing on a Plasmonic Dual-Band Perfect Absorber Using Intersection Nanostructure

“…Narrowband PPAs can function as plasmonic sensors and other photonic devices. − Various PPA structures had been designed to achieve narrow bands, but most of the structures were utilized on multilayer combined systems, ,− which needs proper arrangement between layers in the practical fabrication process and encounters the challenge of manufacture. , The PPAs with excellent optical absorption and sensing performance usually work in the infrared and visible regime . Although the multilayer metal–insulator–metal PPA could attain multiple channels in terahertz frequency for RI sensing application, their low sensing performance and complex geometries are still limited …”