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Resonant Degenerate Four-Wave Mixing at the Defect Energy Levels of 2D Organic–Inorganic Hybrid Perovskite Crystals

https://doi.org/10.1021/acsami.1c14092

Ko, Brian A.; Berry, Keith; Qin, Zhaojun; Sokolov, Alexei V.; Hu, Jonathan; Scully, Marlan O.; Bao, Jiming; Zhang, Zhenrong (December 2021, ACS Applied Materials & Interfaces)

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Lanthanum induced lattice strain improves hydrogen sulfide capacities of copper oxide adsorbents

https://doi.org/10.1002/aic.17484

Canning, Griffin A.; Azzam, Sara A.; Hoffman, Adam S.; Boubnov, Alexey; Alshafei, Faisal H.; Ghosh, Richa; Ko, Brian; Datye, Abhaya; Bare, Simon R.; Simonetti, Dante A. (December 2021, AIChE Journal)

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Interfacing photonic crystal fiber with a metallic nanoantenna for enhanced light nanofocusing

https://doi.org/10.1364/PRJ.411583

Minn, Khant; Birmingham, Blake; Ko, Brian; Lee, Ho Wai Howard; Zhang, Zhenrong (February 2021, Photonics Research)

The direct interfacing of photonic crystal fiber to a metallic nanoantenna has widespread application in nanoscale imaging, optical lithography, nanoscale lasers, quantum communication,in vivosensing, and medical surgery. We report on the fabrication of a needle-shaped plasmonic nanoantenna on the end facet of a photonic crystal fiber using electron-beam-induced evaporation of platinum. We demonstrate the coupling of light from the fiber waveguide mode to the subwavelength nanoantenna plasmonic mode focusing down to the apex of the plasmonic needle using a polarization-resolved far-field side-scatter imaging technique. Our work provides an important step toward widespread application of optical fibers in nearfield spectroscopic techniques such as tip-enhanced Raman and fluorescence microscopy, single-photon excitation and quantum sensors, nanoscale optical lithography, and lab-on-fiber devices.
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Synergistic Effect of Laser, Water Vapor, and Electron-Beam on the Degradation of Quasi-Two-Dimensional Ruddlesden–Popper Perovskite Flakes

https://doi.org/10.1021/acsomega.4c04188

Jiang, Zhenfei; Ko, Brian; Berry, Jr., Keith_R; Xing, Xinxin; Yi, Zhenhuan; Sokolov, Alexei_V; Hu, Jonathan; Bao, Jiming; Zhang, Zhenrong (August 2024, ACS Omega)
Multi-pulse laser-induced bubble formation and nanoparticle aggregation using MoS2 nanoparticles

https://doi.org/10.1038/s41598-020-72689-x

Ko, Brian; Lu, Weigang; Sokolov, Alexei V.; Lee, Ho Wai Howard; Scully, Marlan O.; Zhang, Zhenrong (September 2020, Scientific Reports)

Abstract Understanding of how particles and light interact in a liquid environment is vital for optical and biological applications. MoS₂has been shown to enhance nonlinear optical phenomena due to the presence of a direct excitonic resonance. Its use in biological applications is predicated on knowledge of how MoS₂interacts with ultrafast (< 1 ps) pulses. In this experiment, the interaction between two femtosecond pulses and MoS₂nanoparticles suspended in liquid is studied. We found that the laser pulses induce bubble formation on the surface of a nanoparticle and a nanoparticle aggregate then forms on the surface of the trapped bubble. The processes of formation of the bubble and the nanoparticle aggregation are intertwined.
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