Papers by Nicolas Vandamme
ACS Photonics, 2014
Most plasmonic super absorbers use the excitation of surface plasmons to achieve perfect absorpti... more Most plasmonic super absorbers use the excitation of surface plasmons to achieve perfect absorption in metal nanostructures. We present a design for an ultrathin metal−semiconductor−metal super absorber where light is mainly absorbed within a flat 25 nm thick GaAs semiconductor layer. The top metal layer is patterned as a two-dimensional grid with a subwavelength period and is covered with a thin embedding dielectric layer. We show numerically multiresonant absorption with low polarization and angular dependence. We experimentally demonstrate optical absorption above 80% over the 450−830 nm spectral range using a gold nanogrid. This work opens perspectives toward ultrathin active plasmonic optoelectronic devices and, in particular, highly efficient ultrathin solar cells.
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Papers by Nicolas Vandamme