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In-depth investigation and applications of novel silicon photonics microstructures supporting optical vorticity and waveguiding for ultranarrowband near-infrared perfect absorption

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Photonics Research 2020年第3期8卷 381-394页

作者： ROY AVRAHAMY moshe zohar MARK AUSLENDER BENNY MILGROM SHLOMO HAVA RAFI SHIKLER School of Electrical and Computer Engineering Ben-Gurion University of the NegevBeer-Sheva 84105Israel Electrical and Electronics Engineering Department Shamoon College of EngineeringBeer-Sheva 84100Israel School of Electrical Engineering The Jerusalem College of TechnologyJerusalem 91160Israel Ilse Katz Institute for Nanoscale Science&Technology Ben-Gurion University of the NegevBeer-Sheva 84105Israel

We propose a novel concept of designing silicon photonics metamaterials for perfect near-infrared light *** study's emphasis is an in-depth investigation of various physical mechanisms behind the^100%ultranarrowband record peak absorptance of the designed structures,comprising an ultrathin silicon *** electromagnetic power transport,described by the Poynting vector,is innovatively explored,which shows combined vortex and crossed-junction two-dimensional waveguide-like flows as outcomes of optical field *** flows,though peculiar for each of the designed structures,turn out to be key factors of the perfect resonant optical *** electromagnetic fields show tight two-dimensional confinement:a sharp vertical confinement of the resonant-cavity type combined with a lateral metasurface supported *** siliconabsorbing layer and its oxide environment are confined between two subwavelength metasurfaces such that the entire design is well compatible with silicon-on-insulator *** design concept and its outcomes meet the extensive challenges of ultrathin absorbers for minimum noise and an ultra-narrowband absorptance spectrum,while maintaining an overall very thin structure for planar *** these materials and such objectives,the proposed designs seem essential,as standard approaches fail,mainly due to a very low silicon absorption coefficient over the near-infrared *** tests for fabrication errors show fair tolerability while maintaining a high absorptance peak,along with a controllable deviation off the central-design *** applications are suggested and analyzed,which include but are not limited to:efficient photodetectors for focal plane array and on-chip integrated silicon photonics,high-precision spectroscopic chemical and angular-position sensing,and wavelength-division multiplexing.

关键词： optical waveguide perfect

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