To address the critical challenge of aircraft icing in complex atmospheric environments, this study aims to develop infrared-responsive photothermal materials for efficient de-icing applications. A Cu3BiS3/Bi2S3 heterojunction nanorod structure with localized surface plasmon resonance (LSPR) characteristics was constructed via an ion exchange strategy, forming a stable p-n interface. The structural, optical, and photothermal properties of the material were systematically characterized. Results reveal a distinct LSPR absorption peak near 980 nm and a strong absorption tail extending into the near-infrared region, with considerable absorption retained at 808 nm. Under infrared laser irradiation, the heterostructure exhibits rapid surface temperature elevation up to 70℃ within 10 minutes, significantly outperforming pure Bi2S3. Furthermore, femtosecond transient absorption spectroscopy reveals that LSPR-excited hot carriers undergo efficient interfacial separation and extended lifetimes at the heterojunction, enhancing nonradiative energy dissipation and overall photothermal conversion. This work provides a promising strategy and mechanistic insight for the development of high-efficiency, low-power infrared photothermal de-icing materials for next-generation aerospace applications.