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Micro-3D sculptured metastructures with deep trenches for sub-10 μm resolution.
Anıl Çağrı Atak1, Emre Ünal1, Hilmi Volkan Demir2,3
1Department of Electrical and Electronics Engineering, Department of Physics, UNAM - National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey.
Microsystems & Nanoengineering
|March 12, 2025
Summary
Researchers developed a novel micro-3D printing method to create high-aspect-ratio structures for radio frequency (RF) metastructures. This technique enables sub-10 micrometer resolution, enhancing device performance and miniaturization.
Area of Science:
- Materials Science
- Electrical Engineering
- Nanotechnology
Background:
- Three-dimensional (3D) printing facilitates complex structure fabrication.
- Achieving high aspect ratio vertical structures with high lateral resolution via 3D printing remains a significant challenge.
Purpose of the Study:
- To propose and demonstrate micro-3D sculptured metastructures with deep trenches (1:4 width:height aspect ratio) for sub-10 µm resolution.
- To fabricate and analyze three-dimensional radio frequency (RF) metastructures using a novel 3D printing approach.
Main Methods:
- Utilized two-photon polymerization to create a 3D pattern with trenches.
- Employed electroplating of a thick metal film followed by dry etching to remove the seed layer.
- Fabricated 3D RF metastructures and performed numerical simulations for analysis.
Main Results:
- Successfully created micro-3D sculptured metastructures with deep trenches and sub-10 µm resolution.
- Demonstrated the depth effect in 3D RF metastructures, tailoring resonators to a 4-6 GHz frequency range.
- Achieved miniaturized metal footprint, tunable resonance frequency, and increased quality factor for the fabricated metastructures.
Conclusions:
- The proposed 3D printing process effectively addresses the challenge of fabricating high-aspect-ratio structures.
- This method offers a pathway for implementing complex, high-aspect-ratio structures with enhanced RF performance.
- The technique provides rich opportunities for developing miniaturized and high-performance RF devices.
