Super-resolution imaging via spatiotemporal frequency shifting and coherent detection

Area of Science:

• Optics and Photonics
• Materials Science
• Acoustics

Background:

• The diffraction limit restricts conventional optics from imaging subwavelength features due to the decay of evanescent waves.
• Far-field optics cannot capture high spatial frequency information essential for resolving nanoscale details.

Purpose of the Study:

• To propose a novel approach for recovering evanescent waves in the far field.
• To enable subwavelength-resolved imaging and spatial spectroscopy by overcoming the diffraction limit.
• To adapt the technique for phase-sensitive digital holography.

Main Methods:

• Utilizing scattering on acoustic phonons to shift the frequency and wave vector of near-field components.
• Overcoming the spatial frequency cut-off inherent in far-field detection.
• Adapting the method for digital holography systems.

Main Results:

• Demonstrated a method to recover evanescent waves, effectively removing the spatial frequency cut-off.
• Enabled unambiguous far-field detection of subwavelength features.
• Paved the way for phase-sensitive subwavelength imaging.

Conclusions:

• The proposed technique offers a novel solution for subwavelength imaging and spectroscopy.
• The method is adaptable for digital holography, enhancing imaging capabilities.
• Potential for implementation in mid-IR and THz bands with broader spectral applicability.