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Two-wavelength achromatic diffractive microlens designed by height optimization method fabricated by two-photon
Optics Express
|September 23, 2025
Summary
We developed a faster method to design multiwavelength achromatic diffractive microlenses using an integrated optical path difference and diffraction equation. This 3D nanolithography technique enables efficient fabrication of advanced optical elements.
Area of Science:
- Micro-optics and nanophotonics
- Diffractive optical elements (DOEs)
Background:
- Three-dimensional two-photon nanolithography (3D TPN) fabricates complex microstructures.
- Multiwavelength achromatic diffractive microlenses are challenging to design.
- Conventional methods use computationally intensive simulations or complex fabrication.
Purpose of the Study:
- To propose a computationally efficient optimization framework for multiwavelength diffractive microlenses.
- To enable direct height distribution optimization, reducing computational demands.
Main Methods:
- Integrated optical path difference and Rayleigh-Sommerfeld diffraction equations.
- Direct optimization of height distribution for diffractive microlenses.
- Fabrication using 3D two-photon nanolithography (3D TPN).
Main Results:
- Designed and fabricated a dual-wavelength (green and near-infrared) achromatic microlens.
- Achieved excellent agreement between experimental characterization and theoretical calculations.
- Demonstrated significantly reduced computational demands compared to FDTD methods.
Conclusions:
- The proposed framework offers a computationally efficient strategy for multiwavelength DOE design.
- 3D TPN is a viable technique for fabricating optimized achromatic microlenses.
- Potential applications in integrated photonics and bioimaging.
