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Capability for Fine Tuning of the Refractive Index Sensing Properties of Long-Period Gratings by Atomic Layer Deposited Al(2)O(3) Overlays
This work presents an application of thin aluminum oxide (Al(2)O(3)) films obtained using atomic layer deposition (ALD) for fine tuning the spectral response and refractive-index (RI) sensitivity of long-period gratings (LPGs) induced in optical fibers. The technique allows for an efficient and well...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Molecular Diversity Preservation International (MDPI)
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3892853/ http://dx.doi.org/10.3390/s131216372 |
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author | Śmietana, Mateusz Myśliwiec, Marcin Mikulic, Predrag Witkowski, Bartłomiej S. Bock, Wojtek J. |
author_facet | Śmietana, Mateusz Myśliwiec, Marcin Mikulic, Predrag Witkowski, Bartłomiej S. Bock, Wojtek J. |
author_sort | Śmietana, Mateusz |
collection | PubMed |
description | This work presents an application of thin aluminum oxide (Al(2)O(3)) films obtained using atomic layer deposition (ALD) for fine tuning the spectral response and refractive-index (RI) sensitivity of long-period gratings (LPGs) induced in optical fibers. The technique allows for an efficient and well controlled deposition at monolayer level (resolution ∼ 0.12 nm) of excellent quality nano-films as required for optical sensors. The effect of Al(2)O(3) deposition on the spectral properties of the LPGs is demonstrated experimentally and numerically. We correlated both the increase in Al(2)O(3) thickness and changes in optical properties of the film with the shift of the LPG resonance wavelength and proved that similar films are deposited on fibers and oxidized silicon reference samples in the same process run. Since the thin overlay effectively changes the distribution of the cladding modes and thus also tunes the device's RI sensitivity, the tuning can be simply realized by varying number of cycles, which is proportional to thickness of the high-refractive-index (n > 1.6 in infrared spectral range) Al(2)O(3) film. The advantage of this approach is the precision in determining the film properties resulting in RI sensitivity of the LPGs. To the best of our knowledge, this is the first time that an ultra-precise method for overlay deposition has been applied on LPGs for RI tuning purposes and the results have been compared with numerical simulations based on LP mode approximation. |
format | Online Article Text |
id | pubmed-3892853 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Molecular Diversity Preservation International (MDPI) |
record_format | MEDLINE/PubMed |
spelling | pubmed-38928532014-01-16 Capability for Fine Tuning of the Refractive Index Sensing Properties of Long-Period Gratings by Atomic Layer Deposited Al(2)O(3) Overlays Śmietana, Mateusz Myśliwiec, Marcin Mikulic, Predrag Witkowski, Bartłomiej S. Bock, Wojtek J. Sensors (Basel) Article This work presents an application of thin aluminum oxide (Al(2)O(3)) films obtained using atomic layer deposition (ALD) for fine tuning the spectral response and refractive-index (RI) sensitivity of long-period gratings (LPGs) induced in optical fibers. The technique allows for an efficient and well controlled deposition at monolayer level (resolution ∼ 0.12 nm) of excellent quality nano-films as required for optical sensors. The effect of Al(2)O(3) deposition on the spectral properties of the LPGs is demonstrated experimentally and numerically. We correlated both the increase in Al(2)O(3) thickness and changes in optical properties of the film with the shift of the LPG resonance wavelength and proved that similar films are deposited on fibers and oxidized silicon reference samples in the same process run. Since the thin overlay effectively changes the distribution of the cladding modes and thus also tunes the device's RI sensitivity, the tuning can be simply realized by varying number of cycles, which is proportional to thickness of the high-refractive-index (n > 1.6 in infrared spectral range) Al(2)O(3) film. The advantage of this approach is the precision in determining the film properties resulting in RI sensitivity of the LPGs. To the best of our knowledge, this is the first time that an ultra-precise method for overlay deposition has been applied on LPGs for RI tuning purposes and the results have been compared with numerical simulations based on LP mode approximation. Molecular Diversity Preservation International (MDPI) 2013-11-28 /pmc/articles/PMC3892853/ http://dx.doi.org/10.3390/s131216372 Text en © 2013 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/). |
spellingShingle | Article Śmietana, Mateusz Myśliwiec, Marcin Mikulic, Predrag Witkowski, Bartłomiej S. Bock, Wojtek J. Capability for Fine Tuning of the Refractive Index Sensing Properties of Long-Period Gratings by Atomic Layer Deposited Al(2)O(3) Overlays |
title | Capability for Fine Tuning of the Refractive Index Sensing Properties of Long-Period Gratings by Atomic Layer Deposited Al(2)O(3) Overlays |
title_full | Capability for Fine Tuning of the Refractive Index Sensing Properties of Long-Period Gratings by Atomic Layer Deposited Al(2)O(3) Overlays |
title_fullStr | Capability for Fine Tuning of the Refractive Index Sensing Properties of Long-Period Gratings by Atomic Layer Deposited Al(2)O(3) Overlays |
title_full_unstemmed | Capability for Fine Tuning of the Refractive Index Sensing Properties of Long-Period Gratings by Atomic Layer Deposited Al(2)O(3) Overlays |
title_short | Capability for Fine Tuning of the Refractive Index Sensing Properties of Long-Period Gratings by Atomic Layer Deposited Al(2)O(3) Overlays |
title_sort | capability for fine tuning of the refractive index sensing properties of long-period gratings by atomic layer deposited al(2)o(3) overlays |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3892853/ http://dx.doi.org/10.3390/s131216372 |
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