Dr. Huajun Xu Profile

Dr. Huajun Xu

at Univ of Washington

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Author

Publications (5)

Proceedings Article | 4 October 2022 Presentation

Towards scalable hybrid electro-optics (Conference Presentation)

Lewis Johnson, Scott Hammond, Delwin Elder, Kevin O'Malley, Huajun Xu, Larry Dalton, Bruce Robinson

Proceedings Volume PC12202, PC1220205 (2022) https://doi.org/10.1117/12.2633764

KEYWORDS: Electro optics, Silicon, Quantum communications, Photonic devices, Electronic components

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Proceedings Article | 7 March 2022 Presentation + Paper

Organic electro-optic materials combining extraordinary nonlinearity with exceptional stability to enable commercial applications

Scott Hammond, Kevin O'Malley, Huajun Xu, Delwin Elder, Lewis Johnson

Proceedings Volume 11998, 119980C (2022) https://doi.org/10.1117/12.2622099

KEYWORDS: Chromophores, Electro optics, Modulators, Thin films, Polymers, Absorption, Humidity

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Proceedings Article | 4 August 2021 Presentation + Paper

New paradigms in materials and devices for hybrid electro-optics and optical rectification

Lewis Johnson, Delwin Elder, Huajun Xu, Scott Hammond, Stephanie Benight, Kevin O'Malley, Bruce Robinson, Larry Dalton

Proceedings Volume 11812, 1181202 (2021) https://doi.org/10.1117/12.2595638

KEYWORDS: Chromophores, Electro optics, Frequency conversion, Nanophotonics, Silicon photonics, Photodetectors, Phase shifts, Thin films, Thin film devices, Modulators

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We review recent transformative advances in materials design, synthesis, and processing as well as device engineering for the utilization of organic materials in hybrid electro-optic (EO) and optical rectification (OR) technologies relevant to telecommunications, sensing, and computing. End-to-end (from molecules to systems) modeling methods utilizing multi-scale computation and theory permit prediction of the performance of novel materials in nanoscale device architectures including those involving plasmonic phenomena and architectures in which interfacial effects play a dominant role. Both EO and OR phenomenon require acentric organization of constituent active molecules. The incumbent methodology for achieving such organization is electric field poling, where chromophore shape, dipole moment, and conformational flexibility play dominant roles. Optimized chromophore design and control of the poling process has already led to record-setting advances in electro-optic performance, e.g., voltage-length performance of < 50 volt-micrometer, bandwidths < 500 GHz, and energy efficiency < 70 attojoule/bit. They have also led to increased thermal stability, low insertion loss and high signal quality (BER and SFDR). However, the limits of poling in the smallest nanophotonic devices—in which extraordinary optical field densities can be achieved—has stimulated development of alternatives based on covalent coupling of modern high-performance chromophores into ordered nanostructures. Covalent coupling enables higher performance, greater scalability, and greater stability and is especially suited for the latest nanoscale architectures. Recent developments in materials also facilitate a new technology—transparent photodetection based on optical rectification. OR does not involve electronic excitation, as is the case with conventional photodiodes, and as such represents a novel detection mechanism with a greatly reduced noise floor. OR already dominates at THz frequencies and recent advances will enable superior performance at GHz frequencies as well.

Proceedings Article | 20 August 2020 Presentation

Advances in high-performance hybrid electro-optics

Lewis Johnson, Huajun Xu, Scott Hammond, Delwin Elder, Stephanie Benight, Yovan de Coene, Joseph Hesse-Withbroe, Koen Clays, Larry Dalton, Bruce Robinson

Proceedings Volume 11471, 114710B (2020) https://doi.org/10.1117/12.2568921

KEYWORDS: Electro optics, Quantum computing, Organic materials, Silicon, Gold, Waveguides, Wafer-level optics, Optical components, Lithium niobate, Nanophotonics

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Proceedings Article | 10 September 2019 Presentation

Next-generation materials for hybrid electro-optic systems (Conference Presentation)

Lewis Johnson, Huajun Xu, Yovan de Coene, Delwin Elder, Koen Clays, Larry Dalton, Bruce Robinson

Proceedings Volume 11089, 110890K (2019) https://doi.org/10.1117/12.2530719

KEYWORDS: Electro optical systems, Electro optics, Refractive index, Organic materials, Silicon, Gold, Waveguides, Chromophores, Anisotropy, Mechanical engineering

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