Achieving Tunable and High-Performance Four-THz-Frequency Photodetection by Near-Field Pillars
摘要
Through theoretical simulations, we exploit an array of metal-dielectric-metal pillars which can surprisingly tune the properties of photoresponsivity spectrum by changing periods. That is, the complexity of processing can be mitigated by controlling periods instead of patch sizes. In addition, one can envision a significant enhancement of the responsivity (peak value at 0.128 A/W) compared with the unoptimized GaAs-based device, resulting in a low noise equivalent power (minimum at 0.703 pWHz−1/2) and high specific detectivity (peak value at 6.10 × 1010 Jones), which indicates that a higher operating temperature is possible. Our discovery demonstrates an efficient strategy to simplify the workflow of patchwork design for our ratchet and up-version imaging systems.