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Bird's eye inspired hyperuniform disordered TiO2 meta-atom based high-efficiency metalens
Ohidul Islam1, Dip Sarker2,3, K B M Sharif Mahmood4
1Department of Electrical and Computer Engineering, Auburn University Auburn USA.
Nanoscale Advances
|January 6, 2025
Summary
We developed a novel disordered metalens using titanium dioxide meta-atoms with hyperuniform distribution. This innovative structure achieves high focusing efficiency and mimics ordered metalens performance for advanced imaging applications.
Area of Science:
- Photonics and optical engineering
- Metamaterials science
- Nanotechnology
Background:
- Metalenses offer miniaturized optical components.
- Disordered structures present challenges in predictable optical performance.
- Hyperuniform distributions provide unique scattering properties.
Purpose of the Study:
- To design and analyze a highly efficient near-infrared disordered metalens.
- To investigate the optical and imaging properties of TiO2 meta-atom based structures.
- To explore the potential of hyperuniform disordered distributions in metalens design.
Main Methods:
- Finite-difference time-domain (FDTD) method for optical simulation.
- Engineering phase shift of transmittance using TiO2 meta-atoms.
- Utilizing bird's eye-inspired hyperuniform distribution for meta-atom arrangement.
Main Results:
- Achieved a high focusing efficiency of 84.39% at 820 nm.
- Disordered metalenses demonstrated optical properties comparable to ordered structures.
- Maintained similar focusing efficiencies in the 850-890 nm range due to hyperuniformity.
- Comparable focal length shifts and numerical apertures (NAs) across 770-970 nm.
Conclusions:
- Proposed disordered metalens design offers high efficiency and performance.
- Hyperuniform disordered structures can effectively mimic ordered metalenses.
- This work enables advancements in imaging, sensing, and spectroscopic technologies.
