Complete Conversion and Fast Light From Double Quantum Dot‐Metal Nanoparticle System Under the Orbital Angular Momentum Light

This work studies four‐wave mixing (FWM) in a double quantum dot (DQD)‐metal nanoparticle (MNP) system. Two control optical waves and a weak probe are applied. The probe is characterized by its orbital angular momentum (OAM) light optical properties. An analytical form of the probe and the generated FWM signal is obtained using spatial‐temporal equations. A high second control field reduces efficiency, thereby increasing the FWM signal. At weak coupling DQD‐MNP, the first coupling field increases the efficiency, and a near‐complete conversion is attained. Such a result is unprecedented and arises from the DQD's properties, where the manipulation between DQD states is high and the DQD behaves as a whole system. Weak coupling gives high efficiency. Such a result refers to the direct effect of the controlling fields on the FWM conversion. The OAM number increases the probe and FWM fields. A fast light is obtained, and the group‐velocity peak is shifted under a strong control field. While both complete conversion and fast light are observed at the earliest, other results are within the range reported in the literature. The results obtained are essential for many critical applications.