| Abstract Scope |
We present the early-stage design and fabrication of a nanoparticle optical rectenna designed for efficient mid-infrared (IR) energy conversion. Our device features plasmonic gold nanoparticles (NPs) on a silver electrode, separated by a self-assembled monolayer (SAM) acting as an asymmetric tunneling barrier. An insulating polymer and transparent electrode complete the structure. Under mid-IR illumination (5–10 µm), spin-coated gold NPs enhance local electric fields, establishing a tunneling junction where electrons can tunnel through the SAM and form a rectified DC current. The SAM preparation and deposition processes are described, as well as preliminary testing of the SAM material on substrates sputtered with gold-palladium alloy, a substitute for silver. Two batches of test samples were characterized using atomic force microscopy (AFM), with imaging indicating high orderliness in the analyzed surfaces. Our group looks to perform SAM testing on the intended silver electrode going forward, as well as testing of different SAM materials. |