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Charge Density-Versus Time-Controlled Pulse Anodization in the Production of PAA-Based DBRs for MIR Spectral Region
- Source :
- Energies, Volume 14, Issue 16, Energies, Vol 14, Iss 5149, p 5149 (2021)
- Publication Year :
- 2021
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2021.
-
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 (UH) and low (UL) voltage pulse sequence repeated in cycles. PAA-based DBR consists of alternating high-(dH) and low-porosity (dL) layers translated directly into periodically varied refractive index. Two anodization modes were used: time- and charge density-controlled mode. The former generated dH + dL pairs with non-uniform thickness (∆d) and effective refractive index (∆neff). It is supposed, that owing to a compensation effect between the ∆d and ∆neff, the photonic stopbands (PSBs) were symmetrical and intensive (transmittance close to zero). Under the charge density-controlled mode dH + dL pairs of uniform thickness were formed. However, the remaining ∆neff 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 UH and UL 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.
- Subjects :
- Technology
Control and Optimization
Materials science
porous photonic crystals
Energy Engineering and Power Technology
mid-infrared (MIR)
Transmittance
Electrical and Electronic Engineering
porous anodic alumina (PAA)
Engineering (miscellaneous)
Photonic crystal
Range (particle radiation)
Renewable Energy, Sustainability and the Environment
business.industry
Charge density
Anode
distributed bragg reflector (DBR)
structural engineering
transmission spectra
Optoelectronics
Photonics
business
Refractive index
Energy (miscellaneous)
Voltage
Subjects
Details
- Language :
- English
- ISSN :
- 19961073
- Database :
- OpenAIRE
- Journal :
- Energies
- Accession number :
- edsair.doi.dedup.....5cea5dbba37cfd40084baca28f41dd1e
- Full Text :
- https://doi.org/10.3390/en14165149