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Compact lithium niobate plasmonic modulator
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- Issue Date
- 2024-02
- Citation
- Optics Letters, v.49, no.4, pp.939-942
- ISSN
- 0146-9592
- Publisher
- Optica Publishing Group
- Language
- English
- Type
- Journal Article
- Abstract
- Lithium niobate (LN)-based modulators offer superior modulation performances, including high-speed modulation, linearity, and temperature stability. However, these devices exhibit larger sizes due to the low light–matter interaction despite a significant electro-optic coefficient. In this work, we present a compact LN-based modulator using a plasmonic mode that confines the optical mode in a very narrow gap. By filling the gap with LN, the confinement factor in the LN is significantly enhanced. The proposed modulator provides an extremely small half-wave voltage–length product, VπL of 0.02 V/cm at an optical communication wavelength (λ = 1.55 µm). The proposed modulator scheme can be utilized in a wide range of optical communication devices that demand small footprints and a high-speed operation.
- KSP Keywords
- Confinement factor, Electro-optic coefficient, High-speed operation, Lithium niobate(LN), Low light, Narrow gap, Optical communication devices, Optical mode, Plasmonic mode, Plasmonic modulator, Temperature stability