Tuning the optical properties of nanoporous anodic alumina photonic crystals by control of allowed voltage range via mixed acid concentration

AuthorsSoheila Abbasi mofrad ,Mohammad Almasi Kashi ,Mohammad Noormohammadi, Abdolali Ramazani
JournalElsevier Journal of Physics and Chemistry of Solids
Page number 221-231
Volume number118
IF2.2
Paper TypeFull Paper
Published At2018-1-1
Journal GradeISI
Journal TypeTypographic
Journal CountryIran, 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.

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tags: Photonic crystals Phosphoric acid Tunable pore diameter Photonic band gap Optical sensing