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https://doi.org/10.1002/adom.202202228
Title: | Mid-Infrared Silicon-on-Lithium-Niobate Electro-Optic Modulators Toward Integrated Spectroscopic Sensing Systems | Authors: | Xu, Siyu Ren, Zhihao Dong, Bowei Zhou, Jingkai Liu, Weixin Lee, Chengkuo |
Keywords: | Science & Technology Technology Physical Sciences Materials Science, Multidisciplinary Optics Materials Science electro-optic modulators lithium niobate mid-infrared waveguide platform pure phase modulation silicon photonics transfer printing NITRIDE PHOTONIC CIRCUITS MACH-ZEHNDER MODULATORS THIN-FILM PHASE-SHIFTER WAVE-GUIDES METAMATERIAL MEMS PROGRESS PLATFORM CHIP |
Issue Date: | 9-Dec-2022 | Publisher: | WILEY-V C H VERLAG GMBH | Citation: | Xu, Siyu, Ren, Zhihao, Dong, Bowei, Zhou, Jingkai, Liu, Weixin, Lee, Chengkuo (2022-12-09). Mid-Infrared Silicon-on-Lithium-Niobate Electro-Optic Modulators Toward Integrated Spectroscopic Sensing Systems. ADVANCED OPTICAL MATERIALS 11 (4). ScholarBank@NUS Repository. https://doi.org/10.1002/adom.202202228 | Abstract: | Mid-infrared spectroscopy is an emerging technique in various applications such as molecule identification and label-free chemical sensing. Integrated photonic platforms have a promising potential to perform miniaturized spectroscopic sensing with the advantage of compact footprint, low cost, and low power consumption. As an essential building block for integrated photonics, on-chip phase shifter plays an important role in mid-infrared spectroscopic systems, enabling signal processing and spectrum analysis. However, the implementation of effective pure phase modulation in mid-infrared photonics remains challenging due to the unavoidable electroabsorption in the plasma dispersion effect at a long wavelength. Here, silicon photonic devices are built on lithium niobate substrates to simultaneously leverage the prominent electro-optic effect and circumvent the absorption originating from the oxide layer. In particular, a reliable transfer printing method is presented for flexibly integrating the monocrystalline silicon waveguides with foreign substrates. In the fabricated silicon-on-lithium-niobate platform, the electro-optic performance is exploited via Mach–Zehnder interferometer for operation in the mid-infrared regime. The modulator achieves half-wave voltage length product of 12.3 V∙cm at the wavelength of 3.78 µm, with a maximum extinction ratio of 25.2 dB. These results indicate the potential of the proposed technology for the implementation of integrated mid-infrared spectroscopic sensing systems. | Source Title: | ADVANCED OPTICAL MATERIALS | URI: | https://scholarbank.nus.edu.sg/handle/10635/239127 | ISSN: | 2195-1071 | DOI: | 10.1002/adom.202202228 |
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