Nonlocal Huygens' meta-lens for high-quality-factor spin-multiplexing imaging

Area of Science:

• Optics
• Materials Science
• Biomedical Imaging

Background:

• Combining bright-field and edge-enhanced imaging is crucial for detailed biological sample analysis.
• Existing multiplexing meta-lenses struggle with spectral modulation and wavelength crosstalk, limiting biological applications.

Purpose of the Study:

• To experimentally demonstrate a nonlocal Huygens' meta-lens for high-quality spin-multiplexing imaging.
• To overcome spectral crosstalk limitations in meta-lens imaging for biological applications.

Main Methods:

• Excitation of quasi-bound states in the continuum (q-BICs) to achieve a high quality factor (90).
• Utilizing the generalized Kerker condition and Fano-like interactions for polarization control.
• Demonstrating wavelength-selective focusing and spatial frequency filtering.

Main Results:

• Achieved high polarization conversion efficiency (65%) with minimal unconverted light.
• Demonstrated wavelength-selective focusing for polarization-converted light.
• Enabled spatial frequency filtering for edge detection using unconverted light.

Conclusions:

• The nonlocal Huygens' meta-lens enables simultaneous bright-field and edge-enhanced imaging with spin-multiplexing.
• This versatile framework enhances biomedical imaging and sensing by overcoming spectral crosstalk.