Plasmonic uni-traveling-carrier photodiode

The high-speed photodetector represented by uni-traveling-carrier photodiode is developing towards a higher bandwidth design. The high-bandwidth design will be constrained by the reduced responsivity of the device. Plasmonic photodetectors, due to their ability to confine light at the surface of the metal, can perform light-matter interaction with absorbing materials on a deep subwavelength scale, which providing a new design direction for higher speed photodetectors. We report a high-speed photodetector design that combines uni-traveling-carrier photodiode and plasmonic resonance to achieve a two-fold improvement in device responsivity. The results reveal that plasmonic uni-traveling-carrier photodiode is a potential choice for high-speed photodetector design.