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

Ewelina Białek, Grzegorz Szwachta, Miron Kaliszewski and Małgorzata Norek
Additional contact information
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

Energies, 2021, vol. 14, issue 16, 1-14

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.

Keywords: distributed bragg reflector (DBR); porous photonic crystals; porous anodic alumina (PAA); mid-infrared (MIR); structural engineering; transmission spectra (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/14/16/5149/pdf (application/pdf)
https://www.mdpi.com/1996-1073/14/16/5149/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:14:y:2021:i:16:p:5149-:d:618470

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().