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Modaresialam M, Granchi N, Stehlik M, Petite C, Delegeanu S, Gourdin A, Bouabdellaoui M, Intonti F, Kerzabi B, Grosso D, Gallais L, Abbarchi M. Nano-imprint lithography of broad-band and wide-angle antireflective structures for high-power lasers. OPTICS EXPRESS 2024; 32:12967-12981. [PMID: 38571103 DOI: 10.1364/oe.518828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 03/08/2024] [Indexed: 04/05/2024]
Abstract
We demonstrate efficient anti reflection coatings based on adiabatic index matching obtained via nano-imprint lithography. They exhibit high total transmission, achromaticity (99.5% < T < 99.8% from 390 to 900 nm and 99% < T < 99.5% from 800 to 1600 nm) and wide angular acceptance (T > 99% up to 50 degrees). Our devices show high laser-induced damage thresholds in the sub-picosecond (>5 J/cm2 at 1030 nm, 500 fs), nanosecond (>150 J/cm2 at 1064 nm, 12 ns and >100 J/cm2 at 532 nm, 12 ns) regimes, and low absorption in the CW regime (<1.3 ppm at 1080 nm), close to those of the fused silica substrate.
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Schott M, Repetto L, Savio RL, Firpo G, Angeli E, Valbusa U. Identification of the seeding mechanism in the spinodal instability of dewetting liquids. J Colloid Interface Sci 2022; 632:65-73. [DOI: 10.1016/j.jcis.2022.11.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 11/03/2022] [Accepted: 11/06/2022] [Indexed: 11/13/2022]
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Modaresialam M, Bordelet G, Chehadi Z, O'Byrne M, Favre L, Putero M, Abbarchi M, Grosso D. Enhanced Refractive Index Sensitivity through Combining a Sol-Gel Adsorbate with a TiO 2 Nanoimprinted Metasurface for Gas Sensing. ACS APPLIED MATERIALS & INTERFACES 2021; 13:53021-53029. [PMID: 34708655 DOI: 10.1021/acsami.1c13248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We combine a gas-adsorbent microporous hybrid silica layer and a dense TiO2 Mie resonator array (metasurface), both obtained by sol-gel deposition and nanoimprint lithography, to form nanocomposite systems with high sensitivity for refractive index (RI) variations induced by gas adsorption. Using optical transduction based on direct specular reflection, we show spectral shifts of 4470 nm/RIU corresponding to 0.2 nm/ppm gas (air concentration) and reflection intensity changes of R* = 17 (R/RIU) and 0.55 × 10-3 R/ppm (air concentration). The metasurface is composed of hexagonally arranged TiO2 nanopillar arrays, whereas the surrounding sensitive material is a class II microporous hybrid silica, containing methyl and phenyl covalently bonded organic functions. This hybrid layer shows efficient adsorption capability of volatile organic molecules such as isopropanol, which is used to induce slight variations of RI around the TiO2 antennas. Specular reflectance variations at 45° incidence and refractive index measurements are performed using a spectroscopic ellipsometer. The presence of the titania metasurface enhances the signal by almost an order of magnitude with respect to the 2D counterpart (simulated as an effective medium approximation) and is attributed to the antenna effect, enhancing the interaction of the confined electromagnetic wave with the sensitive microporous medium. This sol-gel nanocomposite system presents many advantages such as high throughput and low-cost elaboration of elements and a high chemical, mechanical, and thermal resistance, ensuring high stability as a potential gas-sensitive nanocomposite layer for long periods. This work is a case study of improving the sensitivity of sol-gel gas-sensitive materials in optical transduction, which will be exploited in further works to develop artificial noses.
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Affiliation(s)
- Mehrnaz Modaresialam
- Aix Marseille Université, Université de Toulon, CNRS, IM2NP, UMR 7334, Campus de St. Jérôme, 13397 Marseille, France
| | - Gabrielle Bordelet
- Aix Marseille Université, Université de Toulon, CNRS, IM2NP, UMR 7334, Campus de St. Jérôme, 13397 Marseille, France
| | - Zeinab Chehadi
- Aix Marseille Université, Université de Toulon, CNRS, IM2NP, UMR 7334, Campus de St. Jérôme, 13397 Marseille, France
| | - Martin O'Byrne
- Aix Marseille Université, Université de Toulon, CNRS, IM2NP, UMR 7334, Campus de St. Jérôme, 13397 Marseille, France
| | - Luc Favre
- Aix Marseille Université, Université de Toulon, CNRS, IM2NP, UMR 7334, Campus de St. Jérôme, 13397 Marseille, France
| | - Magali Putero
- Aix Marseille Université, Université de Toulon, CNRS, IM2NP, UMR 7334, Campus de St. Jérôme, 13397 Marseille, France
| | - Marco Abbarchi
- Aix Marseille Université, Université de Toulon, CNRS, IM2NP, UMR 7334, Campus de St. Jérôme, 13397 Marseille, France
| | - David Grosso
- Aix Marseille Université, Université de Toulon, CNRS, IM2NP, UMR 7334, Campus de St. Jérôme, 13397 Marseille, France
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