Temporal cloak for secure communication based on optical injection semiconductor laser

Intelligent meta-materials can achieve spatial invisibility for objects. In the field of information, information is invisible, but the characteristics of the signal carrying information change with time. The temporal cloak technique conceals information by selectively opening and closing temporal windows in the time domain, effectively masking data from detection light. However, conventional temporal cloaks relying on dispersion or specialized materials lack optical carriers, making event information undetectable by collaborators—a critical limitation. Our solution employs semiconductor lasers with optical injection, achieving temporal cloak activation through precise control of photon numbers and phase synchronization within the cavity. Furthermore, by utilizing low-risk spontaneous emission light as optical carrier, collaborators can receive data while remaining invisible to non-participants. Moreover, we propose time-frequency coding modulation, which greatly enhances the concealment and anti-interference ability.