Authors | Soheila Abbasi mofrad ,Mohammad Almasi Kashi ,Mohammad Noormohammadi, Abdolali Ramazani |
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Journal | Elsevier Journal of Physics and Chemistry of Solids |
Page number | 221-231 |
Volume number | 118 |
IF | 2.2 |
Paper Type | Full Paper |
Published At | 2018-1-1 |
Journal Grade | ISI |
Journal Type | Typographic |
Journal Country | Iran, Islamic Republic Of |
Abstract
This study investigates the tunable fabrication of photonic crystals (PCs) based on nanoporous anodic alumina (NAA) templates through modification of nanopore diameter, affecting the PCs optical response. This was realized by controlling phosphoric acid concentration (CPh) and anodization current density. This approach along with chemical etching offers the opportunity to adjust optical band gap in a wide range of wavelengths (from about 400 to 1100 nm). To this end, the effect of CPh on current density and threshold voltage was investigated. To analyze formation mechanism of resulting multilayers and optimize their optical characteristics, the potential ratio, span, cycles and charge density were examined, thereby providing a band gap as narrow as 6 nm. The sensing analysis revealed that the modified multilayer shows enhanced sensitivity to the changes of effective media inside the nanopores. These findings provide insights into the development of both optical sensors and optoelectronic nanodevices based on the NAA-based PCs.
tags: Photonic crystals Phosphoric acid Tunable pore diameter Photonic band gap Optical sensing