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Type: Conference paper
Title: Fine tuning of transmission features in nanoporous anodic alumina distributed Bragg reflectors
Author: Lim, S.
Law, C.
Santos, A.
Citation: Proceedings of SPIE Nanophotonics Austalasia 2017, 2018 / vol.10456, pp.1045659-1-1045659-15
Publisher: SPIE Press
Publisher Place: United States
Issue Date: 2018
Series/Report no.: Proceedings of SPIE; 10456
ISBN: 9781510613935
ISSN: 0277-786X
Conference Name: SPIE Nanophotonics Australasia 2017 (10 Dec 2017 - 13 Dec 2017 : Melbourne, VIC)
Statement of
Cheryl Suwen Law, Siew Yee Lim and Abel Santos
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.
Keywords: Nanoporous Anodic Alumina; Distributed Bragg Reflectors; Apodisation; Filtering Features; Stepwise Pulse Anodisation
Rights: © 2018 SPIE
RMID: 0030081369
DOI: 10.1117/12.2282250
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Appears in Collections:IPAS publications
Chemical Engineering publications

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