Chinese Optics Letters, 2014, 12 (9): 092401, Published Online: Aug. 21, 2014
Highly enhanced broadband infrared absorption of germanium by multi-layer plasmonic nano-antenna Download: 535次
240.6680 Surface plasmons 230.5750 Resonators 220.2740 Geometric optical design 290.5850 Scattering, particles
Abstract
High-sensitivity and broad bandwidth photo-detector devices are important for both fundamental studies and high-technology applications. Here, by using three-dimensional (3D) finite-difference time-domain simulation, we design an optimized 3D multilayer gold nano-antenna to enhance the nearinfrared (NIR) absorption of germanium nanoparticles. The key ingredient is the simultaneous presence of multiple plasmonic resonance modes with strong light-harvesting effect that encompass a broad bandwidth of germanium absorption band. The simulation results show more than two orders of magnitude enhanced absorption efficiency of germanium around 1550 nm. The design opens up a promising way to build high-sensitivity and broad bandwidth NIR photo-detectors.
Xiaolan Zhong, Ju Liu, Zhiyuan Li. Highly enhanced broadband infrared absorption of germanium by multi-layer plasmonic nano-antenna[J]. Chinese Optics Letters, 2014, 12(9): 092401.