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Thin film lithium niobate electro-optic modulator with terahertz operating bandwidth

Optics express, 2018-05, Vol.26 (11), p.14810-14816 [Peer Reviewed Journal]

ISSN: 1094-4087 ;EISSN: 1094-4087 ;DOI: 10.1364/OE.26.014810 ;PMID: 29877417

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  • Title:
    Thin film lithium niobate electro-optic modulator with terahertz operating bandwidth
  • Author: Mercante, Andrew J ; Shi, Shouyuan ; Yao, Peng ; Xie, Linli ; Weikle, Robert M ; Prather, Dennis W
  • Is Part Of: Optics express, 2018-05, Vol.26 (11), p.14810-14816
  • Description: We present a thin film crystal ion sliced (CIS) LiNbO phase modulator that demonstrates an unprecedented measured electro-optic (EO) response up to 500 GHz. Shallow rib waveguides are utilized for guiding a single transverse electric (TE) optical mode, and Au coplanar waveguides (CPWs) support the modulating radio frequency (RF) mode. Precise index matching between the co-propagating RF and optical modes is responsible for the device's broadband response, which is estimated to extend even beyond 500 GHz. Matching the velocities of these co-propagating RF and optical modes is realized by cladding the modulator's interaction region in a thin UV15 polymer layer, which increases the RF modal index. The fabricated modulator possesses a tightly confined optical mode, which lends itself to a strong interaction between the modulating RF field and the guided optical carrier; resulting in a measured DC half-wave voltage of 3.8 V·cm . The design, fabrication, and characterization of our broadband modulator is presented in this work.
  • Publisher: United States
  • Language: English
  • Identifier: ISSN: 1094-4087
    EISSN: 1094-4087
    DOI: 10.1364/OE.26.014810
    PMID: 29877417
  • Source: Geneva Foundation Free Medical Journals at publisher websites
    Alma/SFX Local Collection
    ROAD: Directory of Open Access Scholarly Resources
    DOAJ Directory of Open Access Journals
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