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Double-layer polarization-independent achromatic metasurface array for optical fiber bundle coupling in
Yan Sun1,2, Chang Wang3,4, Shuhang Zheng1
1State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Scientific Reports
|November 28, 2022
Summary
We developed a compact, double-layer metasurface inspired by insect eyes for microendoscopes. This technology enables miniaturized probes with high-resolution imaging for clinical and industrial applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Biomimetics
Background:
- Microendoscopes are crucial for clinical diagnosis and industrial detection.
- Current microendoscope designs require miniaturization and high-resolution imaging capabilities.
Purpose of the Study:
- To propose a novel double-layer metasurface array for miniaturized microendoscope probes.
- To achieve high-resolution observation with reduced probe size, replacing traditional optical components.
Main Methods:
- Designed a double-layer metasurface array using titanium dioxide (TiO2) nanopillars on a silica substrate.
- Mimicked insect compound eye structures for light deflection and focusing.
- Investigated resonance modes and angular dispersion characteristics of the nanopillars.
- Performed numerical validation for a single unit with a 20° incident angle.
Main Results:
- Each metasurface unit focuses light without chromatic aberration at 470 nm, 530 nm, and 630 nm.
- Achieved a numerical aperture (NA) of 0.287 and theoretically zero telecentricity.
- Demonstrated a focused spot close to the diffraction limit for a 20° incident angle.
- The design offers a compact and ultrathin alternative to traditional optics.
Conclusions:
- The proposed double-layer metasurface array effectively meets the miniaturization and high-resolution requirements for microendoscopes.
- This biomimetic approach significantly reduces probe size while maintaining imaging quality.
- The technology holds promise for advancing optical fiber bundle-based microendoscopy.
