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Control of Q-factor in nanobeam cavities on substrate

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160330ICTON_2016_fin_MarcoDanilo_mod.pdf (357.1Kb)
Date
23/08/2016
Author
Panettieri, Danilo
O'Faolain, Liam
Grande, Marco
Funder
European Research Council
Grant ID
337508 337508
Keywords
Asymmetric structures
Cavities
Low contrast waveguides
Nanobeams
Sensing
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
Computer Networks and Communications
Electrical and Electronic Engineering
Electronic, Optical and Magnetic Materials
NDAS
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Abstract
In this paper, we demonstrate how to efficiently control the quality factor of silicon nitride nanobeam cavities, grown on a silica substrate and embedded in an upper cladding, by engineering the nanobeam cross-section and the shape of the periodic holes. We propose optimized configurations that are able to overcome the decreasing of the Q-factor when the nanobeam is embedded in an asymmetric medium. More precisely, we show that the maximum achievable quality factor can be designed and tuned in asymmetric configurations where the upper cladding is particularly different from the substrate one. These optimized configurations exhibit high-Q factor and small mode volume over a wide range of the upper cladding refractive index paving the way for the realization of innovative optical sensors and for the compensation of fabrication tolerances in embedded optical nanobeam cavities.
Citation
Panettieri , D , O'Faolain , L & Grande , M 2016 , Control of Q-factor in nanobeam cavities on substrate . in 2016 18th International Conference on Transparent Optical Networks, ICTON 2016 . , 7550638 , IEEE , 18th International Conference on Transparent Optical Networks, ICTON 2016 , Trento , Italy , 10/07/16 . https://doi.org/10.1109/ICTON.2016.7550638
 
conference
 
Publication
2016 18th International Conference on Transparent Optical Networks, ICTON 2016
DOI
https://doi.org/10.1109/ICTON.2016.7550638
Type
Conference item
Rights
© 2016, IEEE. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at ieeexplore.ieee.org / https://dx.doi.org/0.1109/ICTON.2016.7550638
Collections
  • Physics & Astronomy Research
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/9567

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