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Proceedings Paper

Fine tuning of transmission features in nanoporous anodic alumina distributed Bragg reflectors
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Paper Abstract

This study introduces an innovative apodisation strategy to tune the filtering features of distributed Bragg reflectors based on nanoporous anodic alumina (NAA-DBRs). The effective medium of NAA-DBRs, which is modulated in a stepwise fashion by a pulse-like anodisation approach, is apodised following a logarithmic negative function to engineer the transmission features of NAA-DBRs. We investigate the effect of various apodisation parameters such as apodisation amplitude difference, anodisation period, current density offset and pore widening time, to tune and optimise the optical properties of NAA-DBRs in terms of central wavelength position, full width at half maximum and quality of photonic stop band. The transmission features of NAA-DBRs are shown to be fully controllable with precision across the spectral regions by means of the apodisation parameters. Our study demonstrates that an apodisation strategy can significantly narrow the width and enhance the quality of the characteristic photonic stop band of NAA-DBRs. This rationally designed anodisation approach based on the combination of apodisation and stepwise pulse anodisation enables the development of optical filters with tuneable filtering features to be integrated into optical technologies acting as essential photonic elements in devices such as optical sensors and biosensors.

Paper Details

Date Published: 2 January 2018
PDF: 15 pages
Proc. SPIE 10456, Nanophotonics Australasia 2017, 1045659 (2 January 2018); doi: 10.1117/12.2282250
Show Author Affiliations
Siew Yee Lim, The Univ. of Adelaide (Australia)
Cheryl Suwen Law, The Univ. of Adelaide (Australia)
Abel Santos, The Univ. of Adelaide (Australia)

Published in SPIE Proceedings Vol. 10456:
Nanophotonics Australasia 2017
James W. M. Chon; Baohua Jia, Editor(s)

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