Influence of Anodization Temperature on Geometrical and Optical Properties of Porous Anodic Alumina(PAA)-Based Photonic Structures

Materials

Ewelina Białek¹  Małgorzata Norek¹  Maksymilian Włodarski² 

[1] Institute of Materials Science and Engineering, Faculty of Advanced Technologies and Chemistry, Military University of Technology, Str. gen Sylwestra Kaliskiego 2, 00-908 Warsaw, Poland;Institute of Optoelectronics, Military University of Technology, Str. gen. Sylwestra Kaliskiego 2, 00-908 Warsaw, Poland;

关键词: porous anodic alumina (PAA);    pulse anodization;    distributed Bragg reflector (DBR);    PAA-based DBR;    transmission spectra;    photonic stop band (PSB);   

DOI  :  10.3390/ma13143185

来源: DOAJ

【 摘 要 】

In this work, the influence of a wide range anodizing temperature (5–30 °C) on the growth and optical properties of PAA-based distributed Bragg reflector (DBR) was studied. It was demonstrated that above 10 °C both structural and photonic properties of the DBRs strongly deteriorates: the photonic stop bands (PSBs) decay, broaden, and split, which is accompanied by the red shift of the PSBs. However, at 30 °C, new bands in transmission spectra appear including one strong and symmetric peak in the mid-infrared (MIR) spectral region. The PSB in the MIR region is further improved by a small modification of the pulse sequence which smoothen and sharpen the interfaces between consecutive low and high refractive index layers. This is a first report on PAA-based DBR with a good quality PSB in MIR. Moreover, it was shown that in designing good quality DBRs a steady current recovery after subsequent application of high potential (U_H) pulses is more important than large contrast between low and high potential pulses (U_H-U_L contrast). Smaller U_H-U_L contrast helps to better control the current evolution during pulse anodization. Furthermore, the lower PSB intensity owing to the smaller U_H-U_L contrast can be partially compensated by the higher anodizing temperature.

【 授权许可】

Unknown