Metal Electrodes for Filtering the Localized Fundamental Mode of a Ridge Optical Waveguide on a Thin Lithium Niobate Nanofilm

An approach for filtering the fundamental mode in an integrated optical modulator with multimode waveguides based on etched thin lithium niobate nanofilms is presented. It is shown that metal electrodes can be used as a modal filter to suppress high-order modes in wide multimode ridge waveguides and...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2023-10, Vol.13 (20), p.2755
Main Authors: Parfenov, Mikhail, Agruzov, Petr, Tronev, Aleksandr, Ilichev, Igor, Usikova, Anna, Zadiranov, Yurii, Shamrai, Aleksandr
Format: Article
Language:English
Subjects:
Analysis
Dielectric films
Electrodes
Etching
Fabrication
Filtration
Identification and classification
integrated photonics
Light
Light modulation
Lithium
Lithium niobate
Lithium niobates
Localization
mode filtering
Modulators
Nanoparticles
optical waveguide
Optical waveguides
Photolithography
Photonics
Propagation
Propagation modes
Properties
Silica
Thin films
thin-film lithium niobate
Topology
Waveguides
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Summary:An approach for filtering the fundamental mode in an integrated optical modulator with multimode waveguides based on etched thin lithium niobate nanofilms is presented. It is shown that metal electrodes can be used as a modal filter to suppress high-order modes in wide multimode ridge waveguides and, consequently, to provide their quasi-single-mode regime of operation. The influence of the gap between the electrodes and its displacement relative to the waveguide symmetry axis is analyzed for various configurations of waveguides. The conditions for quasi-single-mode light propagation with suppression of high-order modes of more than 90 dB/cm are found. The influence of fabrication errors on the efficiency of modal filtering is discussed. Efficient electro-optical modulation with an equivalent voltage-length product of 4 V∙cm has been experimentally demonstrated on integrated optical phase modulator samples fabricated using conventional contact photolithography. The proposed topological solution can be further used for the fast and cheap fabrication of TFLN modulators by conventional contact photolithography. The proposed modal filtering can also be used in other waveguide topologies and in more complex waveguide devices.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano13202755