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Charge Density-Versus Time-Controlled Pulse Anodization in the Production of PAA-Based DBRs for MIR Spectral Region

Author

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  • Ewelina Białek

    (Institute of Materials Science and Engineering, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Str. Gen Sylwestra Kaliskiego 2, 00908 Warsaw, Poland)

  • Grzegorz Szwachta

    (Institute of Materials Science and Engineering, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Str. Gen Sylwestra Kaliskiego 2, 00908 Warsaw, Poland)

  • Miron Kaliszewski

    (Institute of Optoelectronics, Military University of Technology, Str. Gen. Sylwestra Kaliskiego 2, 00908 Warsaw, Poland)

  • Małgorzata Norek

    (Institute of Materials Science and Engineering, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Str. Gen Sylwestra Kaliskiego 2, 00908 Warsaw, Poland)

Abstract

A robust and reliable method for fabricating porous anodic alumina (PAA)-based distributed Bragg reflectors (DBRs), operating in mid-infrared (MIR) spectral region, is presented. The method relies on application of high (U H ) and low (U L ) voltage pulse sequence repeated in cycles. PAA-based DBR consists of alternating high-(d H ) and low-porosity (d L ) layers translated directly into periodically varied refractive index. Two anodization modes were used: time- and charge density-controlled mode. The former generated d H + d L pairs with non-uniform thickness (∆ d ) and effective refractive index (∆ n eff ). It is supposed, that owing to a compensation effect between the ∆ d and ∆n eff , the photonic stopbands (PSBs) were symmetrical and intensive (transmittance close to zero). Under the charge density-controlled mode d H + d L pairs of uniform thickness were formed. However, the remaining ∆ n eff provided an asymmetrical broadening of PSBs. Furthermore, it is demonstrated that the spectral position of the PSBs can be precisely tuned in the 3500–5500 nm range by changing duration of voltage pulses, the amount of charge passing under subsequent U H and U L pulses, and by pore broadening after the electrochemical synthesis. The material can be considered to be used as one-dimensional transparent photonic crystal heat mirrors for solar thermal applications.

Suggested Citation

  • Ewelina Białek & Grzegorz Szwachta & Miron Kaliszewski & Małgorzata Norek, 2021. "Charge Density-Versus Time-Controlled Pulse Anodization in the Production of PAA-Based DBRs for MIR Spectral Region," Energies, MDPI, vol. 14(16), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:16:p:5149-:d:618470
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    References listed on IDEAS

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    1. Mohsen Rostami & Nima Talebzadeh & Paul G. O’Brien, 2020. "Transparent Photonic Crystal Heat Mirrors for Solar Thermal Applications," Energies, MDPI, vol. 13(6), pages 1-13, March.
    2. Rostami, Mohsen & Pirvaram, Atousa & Talebzadeh, Nima & O’Brien, Paul G., 2021. "Numerical evaluation of one-dimensional transparent photonic crystal heat mirror coatings for parabolic dish concentrator receivers," Renewable Energy, Elsevier, vol. 171(C), pages 1202-1212.
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