Engineering optical properties of metal/porous anodic alumina films for refractometric sensing

Lanfang Wang, Xiufang Qin, Dengxin Ji, James P. Parry, Jinqiong Zhang, Chenhua Deng, Guqiao Ding, Qiaoqiang Gan, Hao Zeng, Xiaohong Xu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We show that ultrathin metallic films deposited on porous anodic alumina (PAA) templates can enhance the reflection at certain wavelengths in the visible range, due to Fabry-Perot optical interference. The reflectance spectra can be tuned in a broad range by tuning the structural parameters of PAA including its pore depth, size and porosity. This results in tunable, iridescent colors of the films that can be spatially patterned. A refractometric chemical sensor is designed to convert the change in effective refractive index into the change in the reflectance spectra, which leads to color change discernible by naked eyes. This opens up the possibility for easy-to-operate chemical sensors with extremely low cost.
Original languageEnglish (US)
Pages (from-to)139-144
Number of pages6
JournalApplied Surface Science
Volume355
DOIs
StatePublished - Nov 15 2015
Externally publishedYes

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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