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In-situ diagnostic of femtosecond laser probe pulses for high resolution ultrafast imaging

Light(Science & Applications) 2021年第7期10卷 1326-1338页

作者： Chen Xie Remi Meyer Luc Froehly remo giust Francois Courvoisier Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Technology of Ministry of EducationSchool of Precision Instruments and Opto-electronics EngineeringTianjin University300072 TianjinChina FEMTO-ST Institute Univ.Bourgogne Franche-ComtéCNRS15B avenue des Montboucons25030 Besançon CedexFrance

Ultrafast imaging is essential in physics and chemistry to investigate the femtosecond dynamics of nonuniform samples or of phenomena with strong spatial *** relies on observing the phenomena induced by an ultrashort laser pump pulse using an ultrashort probe pulse at a later *** years have seen the emergence of very successful ultrafast imaging techniques of single non-reproducible events with extremely high frame rate,based on wavelength or spatial frequency ***,further progress in ultrafast imaging towards high spatial resolution is hampered by the lack of characterization of weak probe *** pump–probe experiments realized within solids or liquids,because of the difference in group velocities between pump and probe,the determination of the absolute pump–probe delay depends on the sample *** addition,pulse-front tilt is a widespread issue,unacceptable for ultrafast imaging,but which is conventionally very difficult to evaluate for the low-intensity probe *** we show that a pump-induced micro-grating generated from the electronic Kerr effect provides a detailed in-situ characterization of a weak probe *** allows solving the two issues of absolute pump–probe delay determination and pulse-front tilt *** approach is valid whatever the transparent medium with nonnegligible Kerr index,whatever the probe pulse polarization and *** it is nondestructive and fast to perform,this in-situ probe diagnostic can be repeated to calibrate experimental conditions,particularly in the case where complex wavelength,spatial frequency or polarization encoding is *** anticipate that this technique will enable previously inaccessible spatiotemporal imaging in a number of fields of ultrafast science at the micro-and nanoscale.

关键词： pump polarization laser

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A DNA sensor based on upconversion nanoparticles and two-dimensional dichalcogenide materials

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Frontiers of Chemical Science and Engineering 2021年第4期15卷 935-943页

作者： Konstantina Alexaki Davide giust Maria-Eleni Kyriazi Afaf H.El-Sagheer Tom Brown Otto L.Muskens Antonios G.Kanaras School of Physics and Astronomy Faculty of Engineering and Physical SciencesUniversity of SouthamptonSouthampton SO171BJUK Department of Chemistry University of OxfordChemistry Research LaboratoryOxford OX13TAUK Chemistry Branch Department of Science and MathematicsFaculty of Petroleum and Mining EngineeringSuez UniversitySuez 43721Egypt Institute for Life Sciences University of SouthamptonSouthampton SO171BJUK

We demonstrate the fabrication of a new DNA sensor that is based on the optical interactions occurring between oligonucleotide-coated NaYF4:Yb^(3+);Er^(3+) upconversion nanoparticles and the two-dimensional dichalcogenide materials,MoS_(2) and WS_(2).Monodisperse upconversion nanoparticles were functionalized with single-stranded DNA endowing the nanoparticles with the ability to interact with the surface of the two-dimensional materials via van der Waals interactions leading to subsequent quenching of the upconversion *** contrast,in the presence of a complementary oligonucleotide target and the formation of double-stranded DNA,the upconversion nanoparticles could not interact with MoS_(2) and WS_(2),thus retaining their inherent fluorescence *** this sensor we were able to detect target oligonucleotides with high sensitivity and specificity whilst reaching a concentration detection limit as low as 5 mol·L^(-1),within minutes.

关键词： upconversion nanoparticles DA sensor two-dimensional materials MoS_(2) WS_(2)

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选择适合目标应用的正确时钟芯片

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电子产品世界 2005年第12A期12卷 108-110页

作者： Gary giust Cypress Semiconductor CCD

本文对时钟芯片划分为若干基本大类,供设计者做出更加明智的时钟选择.

关键词：时钟芯片应用设计者

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