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Lookup NU author(s): Dr Reza Ramezani, Peimin Yuan, Dimitrios Firfilionis, Professor Patrick DegenaarORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Photonics and Optoelectronics are becoming increasingly important for use in implantable devices. In animal trials, although not desirable, failure can lead to the direct replacement of either the component or the test subject. In human implementations, however, the longevity of implantable devices typically needs to exceed 5 years and, in some cases, decades. Traditional hermetic metal packages, per definition, are impervious to water vapour. However, such packaging is unsuitable for structures which are millimetre sized or less. Brain probes encompassing optical micro-emitters must, therefore, use protective passivation/encapsulation layers such as silicon oxynitrides/silicone. However, such protection is prone to electrolytic failure driven by the LED-driving voltages. In this paper, we describe an electrical driving methodology which can improve device lifetime of encapsulated devices by balancing time-averaged electric fields to zero. We have tested the method on commercial optrodes to demonstrate platform independence. We show that, with this method, the time to failure can be increased by over two orders of magnitude.
Author(s): Ramezani R, Soltan A, Yuan P, Firfilionis D, Donaldson N, Degenaar P
Publication type: Article
Publication status: Published
Journal: IEEE Transactions on Biomedical Engineering
Year: 2025
Pages: epub ahead of print
Online publication date: 03/11/2025
Acceptance date: 30/10/2025
Date deposited: 11/11/2025
ISSN (print): 0018-9294
ISSN (electronic): 1558-2531
Publisher: IEEE
URL: https://doi.org/10.1109/TBME.2025.3628446
DOI: 10.1109/TBME.2025.3628446
ePrints DOI: 10.57711/ztzr-kr71
PubMed id: 41182931
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