Abstract
The development of gradient index free-form micro-optic components dedicated to the mid-infrared range is challenging due to the lack of appropriate technology. We propose a method for developing gradient index components for broadband infrared range beyond the transmission window of silicate glass based on nanostructurization using a stack-and-draw fiber drawing technique. A proof-of-concept microlens is developed and verified experimentally in the wavelength range 1.5–4.3 µm. The microlenses are composed of a set of nanorods with a diameter of 940 nm made of a pair of SiO2-PbO-Bi2O3-Ga2O3 based glasses ordered into the preliminary calculated binary pattern. The pattern forms effectively continuous parabolic refractive index distribution for infrared range according to Maxwell-Garnett effective medium model. The development of individual microlenses with a diameter of 118 µm and focal length of 278 µm at the wavelength of 3.75 µm are reported. A large array of 737 microlenses with an individual diameter of 125 µm and focal length of 375 µm is also presented and analyzed.
Original language | English |
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Pages (from-to) | 2338-2352 |
Journal | Optics Express |
Volume | 30 |
Issue number | 2 |
DOIs | |
Publication status | Published - 17 Jan 2022 |
MoE publication type | A1 Journal article-refereed |
Funding
Funding. Horizon 2020 Framework Programme (grant No. 722380 [SUPUVIR]); H2020 Industrial Leadership (644192, 644192 [MIREGAS], EU-H2020-ICT-2014); Fundacja na rzecz Nauki Polskiej (TEAM TECH/2016-1/1); European Regional Development Fund (POIR.04.04.00-00-1C74/16).