Split Bull’s Eye Antenna for High-Speed Photodetector in the Range of Visible to Mid-Infrared

Split bull's eye (SBE) antenna was developed to efficiently concentrate electromagnetic energy into an ultra-small area, and thereby enhanced the responsivity of high-speed near-infrared photodetectors. Here, we extend the investigation over a wider spectral range, and analyze the enhancement mechanisms based on finite-difference time-domain simulations. The SBE antenna exhibits far greater transm...