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Microfluidics generation of chitosan microgels containing glycerylphytate crosslinker for in situ human mesenchymal stem cells encapsulation

https://doi.org/10.1016/j.msec.2020.111716

Mora-Boza, Ana; Mancipe Castro, Lina M.; Schneider, Rebecca S.; Han, Woojin M.; García, Andrés J.; Vázquez-Lasa, Blanca; San Román, Julio (January 2021, Materials Science and Engineering: C)

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Generation of extreme-ultraviolet beams with time-varying orbital angular momentum

https://doi.org/10.1126/science.aaw9486

Rego, Laura; Dorney, Kevin M.; Brooks, Nathan J.; Nguyen, Quynh L.; Liao, Chen-Ting; San Román, Julio; Couch, David E.; Liu, Allison; Pisanty, Emilio; Lewenstein, Maciej; et al (June 2019, Science)

Light fields carrying orbital angular momentum (OAM) provide powerful capabilities for applications in optical communications, microscopy, quantum optics, and microparticle manipulation. We introduce a property of light beams, manifested as a temporal OAM variation along a pulse: the self-torque of light. Although self-torque is found in diverse physical systems (i.e., electrodynamics and general relativity), it was not realized that light could possess such a property. We demonstrate that extreme-ultraviolet self-torqued beams arise in high-harmonic generation driven by time-delayed pulses with different OAM. We monitor the self-torque of extreme-ultraviolet beams through their azimuthal frequency chirp. This class of dynamic-OAM beams provides the ability for controlling magnetic, topological, and quantum excitations and for manipulating molecules and nanostructures on their natural time and length scales.
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Controlling the polarization and vortex charge of attosecond high-harmonic beams via simultaneous spin–orbit momentum conservation

https://doi.org/10.1038/s41566-018-0304-3

Dorney, Kevin M.; Rego, Laura; Brooks, Nathan J.; San Román, Julio; Liao, Chen-Ting; Ellis, Jennifer L.; Zusin, Dmitriy; Gentry, Christian; Nguyen, Quynh L.; Shaw, Justin M.; et al (February 2019, Nature Photonics)

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