Authors:

Evan E Tuckley

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About Paper:

Microscale 3D printing has many applications in biomedical, computer, aerospace, and other fields of engineering. It shows promise to produce a meta-lens, which is made of sub-diffraction sized pillars to manipulate light in a smaller volume than traditional curved lenses. We plan to use a method called two-step absorption which utilizes a nonlinear response in the printing materials to reach nanoscale accuracy. The current mainstream method is two-photon absorption that utilizes expensive femtosecond lasers. There is need for using a low-cost method in meta- lens construction. We seek to prove that two-step absorption is a feasible low-cost alternative to the two-photon method for the printing of a meta- lens. The quadratic nonlinearity utilized by two-step absorption allows for the necessary spatial accuracy to replace two photon absorption at multiple magnitudes smaller in space and price. To test this, we have created a resin using Benzil as a photo initiator and an acrylate monomer to create nano-pillar structures to prove potential use in a meta-lens constructure. Our system utilizes a continuous-wave 405-nm laser, with a working power of approximately 100 µW. Additionally, results of resolution size and pitch (spacing between pillars) were compared with the Nanoscribe system that utilizes two-photon absorption. We hope to find a similar feature size of about 100 nm laterally and 300 nm axially. Keywords: Nano Scale 3D Printing; Optics; Meta-Lens

Source:

Purdue University / 2025

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Co-authors:

Evan E Tuckley