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Summary

This summary is machine-generated.

This study introduces a novel metasurface integrated with a gradient refractive index (GRIN) lens for scanning fiber endoscopy. This hybrid design significantly improves imaging resolution and corrects optical aberrations for better disease diagnosis.

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Area of Science:

Optical Engineering
Biomedical Imaging
Nanophotonics

Background:

Scanning fiber endoscopy offers high-resolution imaging for disease diagnosis.
Current probes use refractive lenses, but off-axis aberrations limit resolution.
Gradient refractive index (GRIN) lenses are common micro-objectives in these systems.

Purpose of the Study:

To propose and validate a novel hybrid refractive-metasurface design for scanning fiber endoscopy.
To address and correct off-axis optical aberrations in fiber-scanning endoscopes.
To enhance imaging resolution uniformity across the entire field of view.

Main Methods:

Integration of a metasurface corrector with a GRIN micro-objective.
Utilizing a fiber-scanning endoscope for both excitation and collection.
Employing Ansys simulation platform for coupled macroscale and nanoscale optical modeling.
Experimental validation of the hybrid design at a 644 nm wavelength.

Main Results:

The hybrid refractive-metasurface design effectively corrects optical aberrations.
A uniform resolution of 3 µm was achieved at the center of the imaging field.
Resolution degradation at the field edge was minimal (0.13 factor compared to the center).

Conclusions:

The proposed metasurface-GRIN hybrid design significantly enhances optical performance in scanning fiber endoscopy.
This compact, aberration-corrected system improves resolution uniformity, crucial for early disease detection.
The technology shows great potential for minimally invasive diagnostic applications.