Chalcogenide-based, all-dielectric, ultrathin metamaterials with perfect, incidence-angle sensitive, mid-infrared absorption: inverse design, analysis, and applications

Abstract

The demand for miniature, low-cost, utmost efficient optical absorbers triggered ongoing research efforts to minimize the overall design thickness, particularly the photo-active layer, while still maintaining a high optical absorptance....

Enhanced Optical Confinement Enriching the Power Conversion Efficiency of Integrated 3D Grating Organic Solar Cell

“…The optimal design aims to maximize an array of samples, for which the sampling is taken from a predefined wavelength vector within the desired wavelength range. Since the objective here is to achieve a broad absorptance spectrum , the optimization algorithm continues to “wisely” choose values until it succeeds in attaining higher than a predefined value or reaches the predefined maximum number of iterations [ 45 , 46 ].…”

Mid-infrared photodetector spectrometer concept based on ultra-thin all-dielectric metamaterial with azimuth-incidence-angle tuned perfect optical absorption: Design and analysis

“…The PD layout element, pixel hereinafter, which we use further in the spectrometer design, belongs to a class of perfect light-absorbing MMs that possess a spectral-azimuth-angle absorption tuning to very high, sometimes upmost, values. We reported the absorption sensitivity of other designs in 14 . The design proposed here is specifically optimized for spectroscopy in terms of absorptance tunning, efficiency, linewidth, and noise suppression, as followingly discussed.…”

“…But nowadays, it apparently becomes partially or completely achievable, with the advent of the concept, design, and fabrication routes of optical microcavities 8 , photonic crystals (PhC) 9 , metasurfaces (MSs) 10 , and metamaterials (MMs) 11 . In particular, one can concurrently bypass the limitations of low photo-absorption and lower bound on the thickness of the photo-absorbing layer, inherent to the monolithic PD designs, with planar-layers resonant-cavity-enhanced (RCE) MMs, and the large overall thicknesses of the IR RCE PDs, with MS embedded MMs 12,13 , for an overview see 14 and citations therein. It has been shown 14 that with very few thin dielectric layers, which enclose an ultra-thin photo-absorbing film and MS atop, one can design diverse MM PDs for the mid-wave infrared (MWIR) range that have ∼ 100% peaky normal-incidence absorption spectra.…”

“…In particular, one can concurrently bypass the limitations of low photo-absorption and lower bound on the thickness of the photo-absorbing layer, inherent to the monolithic PD designs, with planar-layers resonant-cavity-enhanced (RCE) MMs, and the large overall thicknesses of the IR RCE PDs, with MS embedded MMs 12,13 , for an overview see 14 and citations therein. It has been shown 14 that with very few thin dielectric layers, which enclose an ultra-thin photo-absorbing film and MS atop, one can design diverse MM PDs for the mid-wave infrared (MWIR) range that have ∼ 100% peaky normal-incidence absorption spectra. Remarkably, in addition to well explored in recent years geometrical tuning the performance, for transparent, reflecting, and plasmonic MMs, some of perfect photo-absorption MMs, we designed 14 , show a high sensitivity of the absorption peak to the azimuth angle of the impinging linearly-polarized radiation and its unique spectral-azimuth tuning to the uppermost values.…”

“…It has been shown 14 that with very few thin dielectric layers, which enclose an ultra-thin photo-absorbing film and MS atop, one can design diverse MM PDs for the mid-wave infrared (MWIR) range that have ∼ 100% peaky normal-incidence absorption spectra. Remarkably, in addition to well explored in recent years geometrical tuning the performance, for transparent, reflecting, and plasmonic MMs, some of perfect photo-absorption MMs, we designed 14 , show a high sensitivity of the absorption peak to the azimuth angle of the impinging linearly-polarized radiation and its unique spectral-azimuth tuning to the uppermost values.…”