Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Integrated Polarisation Control in Microlens Arrays: Performance at Visible-Ir Spectral Ranges

Version 1 : Received: 6 March 2023 / Approved: 6 March 2023 / Online: 6 March 2023 (14:05:35 CET)

A peer-reviewed article of this Preprint also exists.

Mu, H.; Smith, D.; Katkus, T.; Gailevičius, D.; Malinauskas, M.; Nishijima, Y.; Stoddart, P.R.; Ruan, D.; Ryu, M.; Morikawa, J.; Vasiliev, T.; Lozovski, V.; Moraru, D.; Ng, S.H.; Juodkazis, S. Polarisation Control in Arrays of Microlenses and Gratings: Performance in Visible–IR Spectral Ranges. Micromachines 2023, 14, 798. Mu, H.; Smith, D.; Katkus, T.; Gailevičius, D.; Malinauskas, M.; Nishijima, Y.; Stoddart, P.R.; Ruan, D.; Ryu, M.; Morikawa, J.; Vasiliev, T.; Lozovski, V.; Moraru, D.; Ng, S.H.; Juodkazis, S. Polarisation Control in Arrays of Microlenses and Gratings: Performance in Visible–IR Spectral Ranges. Micromachines 2023, 14, 798.

Abstract

Microlens arrays (MLAs) which are increasingly popular micro-optical elements in compact integrated optical systems were fabricated by femtosecond direct laser write (fs-DLW) technique in the low-shrinkage SZ2080TM photoresist. High fidelity definition of 3D surfaces on IR transparent CaF2 substrates allowed to achieve ∼ 50% transmittance at chemical fingerprinting spectral region 2-5 μm wavelengths since MLAs were only ∼ 10 μm high corresponding to the numerical aperture of 0.3 (the lens height is comparable with the IR wavelength). To combine diffractive and refractive capabilities in miniaturised optical setup, a graphene oxide (GO) grating acting as a linear polariser was also fabricated by fs-DLW by ablation of a 1 μm-thick GO thin film. Such an ultra-thin GO polariser can be integrated with the fabricated MLA to add dispersion control at the focal plane. Pairs of MLAs and GO polarisers were characterised throughout visible-IR spectral window and numerical modeling was used to simulate their performance. Good match between experimental results of MLA focusing and simulations was achieved.

Keywords

laser polymerisation pgaphene oxide polariser, microlens array

Subject

Physical Sciences, Optics and Photonics

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