Cross-waveband optical computing imaging.

Area of Science:

• Optics
• Computational Imaging
• Spectroscopy

Background:

• Single-pixel imaging (SPI) and ghost imaging (GI) are computational imaging techniques.
• Traditional GI/SPI often relies on electronic demodulation and may require detectors in specific spectra.
• Limitations exist in detector availability or cost for certain electromagnetic spectra.

Purpose of the Study:

• To demonstrate a novel cross-spectral optical computing imaging experiment.
• To integrate SPI and GI using a unique experimental setup.
• To achieve image reconstruction in a different spectral band than the initial illumination.

Main Methods:

• Integration of SPI and GI via a photoelectric conversion circuit and synchronous modulation.
• Modulation of light in one wavelength band (SPI) and demodulation in another using GI algorithms.
• Implementation of optical computing for demodulation, replacing conventional electronic methods.

Main Results:

• Successful proof-of-concept cross-band imaging from near-infrared (NIR) to visible light.
• Image acquisition at 20 frames per second using NIR illumination.
• Reconstruction of images in the visible light spectrum.

Conclusions:

• The developed method validates the feasibility of cross-spectral imaging with optical computing.
• This approach expands potential applications for SPI and GI.
• It offers a viable solution for imaging in spectra where 2D detector arrays are unavailable or costly, such as X-ray and terahertz.