[18p-211B-1~13] 4.1 Plasmonics and Nanophotonics

▲ [18p-211B-7] Kerker effect Germanium metasurface optical absorber at 1.55 um

〇(M2)Zoung-Xing Zhou¹, Jhen-Hong Yang¹, Kuo-Ping Chen² (1.Institute of Photonic System, National Chiao Tung University,Taiwan, 2.Institute of Imaging and Biomedical Photonics, National Chiao Tung University,Taiwan)

Keywords:Mie resonance, Lattice resonance, Absorber

For silicon photonics, the infrared wavelengths around 850 nm, 1300 nm, 1550 nm are typically used. Germanium are the conventional materials of choice of NIR photodetectors due to their good absorption and transport properties.
In this work, we demonstrate a narrow-band absorber by applying the Kerker effect and amorphous germanium nanoantenna arrays (a-Ge NA arrays) with lattice resonances. The Ge metasurface can generate a high absorptance peak at 1550 nm. Comparing with Ge thin films, the Ge metasurface can get 11-fold increase in absorptance.