Ultra-fast silicon electro-optic modulator based on ITO-integrated directional coupler
Author's Department
Physics Department
Second Author's Department
Physics Department
Third Author's Department
Physics Department
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https://iopscience.iop.org/article/10.1088/1402-4896/ab0ce1
Document Type
Research Article
Publication Title
Physica Scripta
Publication Date
1-1-2019
doi
10.1088/1402-4896/ab0ce1
Abstract
An optical modulator is a very essential component in optoelectronic communication system as it generates an optical data stream out of an applied electric signal. Designing devices with subwavelength dimensions turned out to be a challenge constrained by the 'diffraction limit'. Plasmonic-based devices had overcome this issue, reaching miniature footprint but introducing high propagation losses. Alternative materials such as conducting transparent oxides (TCOs) act as an optical dielectric material with an excess of free carriers. By adjusting the gating potential on such materials, an epsilon-near-zero state can be reached and the material exhibits a metal-like behavior, in terms of the optical losses. A very popular TCO material is indium tin oxide (ITO). In this work, ITO is utilized in electro-optic modulator design based on a directional coupler device with a slot waveguide platform. The design introduces an ITO/HfO2 combination in the coupler section waveguide. An extinction ratio more than 9 dB and an insertion loss less than 0.9 dB are achieved at a telecommunication standard wavelength of 1.55 μm. Additionally, an average energy per bit (E) of 4.355 fJ/bit as well as an operating bandwidth up to 1 THz, under optimal conditions, are attained.
Recommended Citation
APA Citation
Badr, M. M.
Abdelatty, M. Y.
&
Swillam, M.
(2019). Ultra-fast silicon electro-optic modulator based on ITO-integrated directional coupler. Physica Scripta, 94(6),
10.1088/1402-4896/ab0ce1
https://fount.aucegypt.edu/faculty_journal_articles/470
MLA Citation
Badr, Mohamed, et al.
"Ultra-fast silicon electro-optic modulator based on ITO-integrated directional coupler." Physica Scripta, vol. 94,no. 6, 2019,
https://fount.aucegypt.edu/faculty_journal_articles/470