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.
© 2014 Chinese Optics Letters
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