Wavelength domain spatial frequency modulation imaging: enabling fiber optic delivery and detection.

Area of Science:

• Optics and Photonics
• Image Processing
• Computational Imaging

Background:

• Spatial frequency modulation imaging (SPIFI) is a technique for modulating illumination sources in single-pixel imaging systems.
• Existing spatial domain SPIFI (SD-SPIFI) offers enhanced resolution but is limited by free-space optical configurations.

Purpose of the Study:

• To demonstrate wavelength domain SPIFI (WD-SPIFI) for enhanced resolution imaging.
• To explore the advantages of WD-SPIFI, including remote delivery via single-mode fiber.
• To develop a cascaded system combining WD-SPIFI and SD-SPIFI for scanning-free 2D single-pixel imaging.

Main Methods:

• Encoding time-varying spatial frequencies in the spectral domain to create WD-SPIFI.
• Utilizing single-mode fiber for remote signal delivery in WD-SPIFI.
• Integrating WD-SPIFI and SD-SPIFI in a cascaded configuration for 2D imaging.

Main Results:

• WD-SPIFI successfully produced enhanced resolution images, analogous to SD-SPIFI.
• WD-SPIFI demonstrated compatibility with single-mode fiber for remote illumination delivery.
• A cascaded WD-SPIFI and SD-SPIFI system achieved scanning-free 2D single-pixel imaging.

Conclusions:

• WD-SPIFI is a viable extension of SPIFI, offering enhanced resolution and remote delivery capabilities.
• The developed cascaded system provides a novel approach for scanning-free 2D single-pixel imaging, expanding SPIFI applications.
• WD-SPIFI's fiber compatibility makes it suitable for imaging scenarios where free-space optics are impractical.