One-Dimensional Surface Plasmon Photonic Crystal Slab (SPPCS) for a Nanophotodiode

For miniaturization of a photodiode, we present a new design concept to increase photogeneration rate in a small active domain by using subwavelength structures consisting of surface plasmon photonic crystal slab (SPPCS) acting like a near-field generator and an antireflection coating. The polarizability of rectangular metallic cylinder predicts surface plasmon (SP) resonance frequency in the SPPCS photodiode. Thus, the enhanced near-field intensity arising from SP resonant oscillation has a potential to solve the low photogeneration problem. In addition, photonic band structure dramatically changes TM photonic maps with extraordinary transmission and low reflection, thereby leading to an efficient nanophotodiode.