Miniaturized spectrometer with intrinsic long-term image memory.

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Miniaturized spectrometers are crucial for portable optoelectronics and wearable sensors.
• Current von Neumann architectures face energy consumption and speed limitations due to spatial separation of modules.

Purpose of the Study:

• To develop a miniaturized spectrometer overcoming von Neumann architecture limitations.
• To integrate photodetection, spectrum reconstruction, and processing into a single device.

Main Methods:

• Utilized a single SnS₂/ReSe₂ van der Waals heterostructure.
• Investigated interface trap states for photogating and optoelectronic memory effects.

Main Results:

• Achieved a compact 19 μm footprint spectrometer.
• Demonstrated a broad bandwidth (400–800 nm) with 5 nm spectral resolution.
• Exhibited long-term image memory (>10⁴ s) and integrated signal processing.

Conclusions:

• The single-detector computational spectrometer offers a path beyond von Neumann architectures.
• This approach enables highly efficient and compact spectral sensing and processing.