Dual-mode visible/UV-blind Sb₂Se₃ photodetector for secure single-pixel imaging

Area of Science:

• Optoelectronics
• Materials Science
• Imaging Technology

Background:

• Single-pixel imaging offers inherent security through algorithmic coding.
• Enhancing the security of imaging systems is crucial for sensitive applications.
• Antimony selenide (Sb₂Se₃) based photodetectors (PDs) show promise for specialized optical sensing.

Purpose of the Study:

• To develop a dual-mode photodetector for single-pixel imaging with improved security.
• To engineer a Sb₂Se₃ PD exhibiting both UV-blind and visible-blind characteristics.
• To demonstrate the feasibility of secure single-pixel imaging using the proposed dual-mode PD.

Main Methods:

• Fabrication of a Cu/Ag/TiO₂/Sb₂Se₃/ITO/IGO structured photodetector.
• Characterization of the photodetector's response in UV and visible light spectra.
• Implementation of the dual-mode PD in a single-pixel imaging setup.

Main Results:

• The PD demonstrated UV-blind operation (e.g., low responsivity at 254 nm) and visible-blind operation (e.g., low responsivity to white light) at 0 V bias.
• Specific responsivity values were recorded for different wavelengths (254 nm, 365 nm, 395 nm) and white light under both modes.
• Successful demonstration of secure single-pixel imaging using the dual-mode Sb₂Se₃ PD.

Conclusions:

• The proposed dual-mode Sb₂Se₃ PD effectively enhances security in single-pixel imaging.
• This dual-mode functionality opens new avenues for secure camera systems.
• The study highlights the potential of Sb₂Se₃ PDs for advanced imaging applications.