In this paper, we extensively study the higher-order harmonic generation of the general limited diffraction m-th- order Bessel beam. The analysis is based on successive approximations of the Khokhlov-Zabolotskaya-Kuzn...In this paper, we extensively study the higher-order harmonic generation of the general limited diffraction m-th- order Bessel beam. The analysis is based on successive approximations of the Khokhlov-Zabolotskaya-Kuznetsov （KZK） equation. Asymptotic expansions are presented for higher-order harmonic Bessel beams in near and far fields. The validity of asymptotic approximation is also analyzed. The higher-order harmonic of the Bessel beam with the lowest zero-order is taken as a special example.展开更多
In an electron storage ring, the bunch length can be increased or decreased by using harmonic cavities. Taking the High Energy Photon Source as an example, we test the bunch length manipulation with harmonic cavities ...In an electron storage ring, the bunch length can be increased or decreased by using harmonic cavities. Taking the High Energy Photon Source as an example, we test the bunch length manipulation with harmonic cavities in a diffraction-limited storage ring （DLSR）. The most important collective effects in a DLSR, intra-beam scattering and Touschek effects, are evaluated for different bunch-length patterns. Our study shows that it is feasible to produce long and short bunches simultaneously in a DLSR, without causing severe emittance growth and reduction in lifetime.展开更多
Investigations of ultrafast processes occurring on the nanoscale require a combination of femtosecond pulses and nanometer spatial resolution.However,controlling femtosecond pulses with nanometer accuracy is very chal...Investigations of ultrafast processes occurring on the nanoscale require a combination of femtosecond pulses and nanometer spatial resolution.However,controlling femtosecond pulses with nanometer accuracy is very challenging,as the limitations imposed both by dispersive optics on the time duration of a pulse and by the spatial diffraction limit on the focusing of light must be overcome simultaneously.In this paper,we provide a universal method that allows full femtosecond pulse control in subdiffraction-limited areas.We achieve this aim by exploiting the intrinsic coherence of the second harmonic emission from a single nonlinear nanoparticle of deep subwavelength dimensions.The method is proven to be highly sensitive,easy to use,quick,robust and versatile.This approach allows measurements of minimal phase distortions and the delivery of tunable higher harmonic light in a nanometric volume.Moreover,the method is shown to be compatible with a wide range of particle sizes,shapes and materials,allowing easy optimization for any given sample.This method will facilitate the investigation of light–matter interactions on the femtosecond–nanometer level in various areas of scientific study.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11074038 and 11374051)
文摘In this paper, we extensively study the higher-order harmonic generation of the general limited diffraction m-th- order Bessel beam. The analysis is based on successive approximations of the Khokhlov-Zabolotskaya-Kuznetsov （KZK） equation. Asymptotic expansions are presented for higher-order harmonic Bessel beams in near and far fields. The validity of asymptotic approximation is also analyzed. The higher-order harmonic of the Bessel beam with the lowest zero-order is taken as a special example.
基金Supported by National Natural Science Foundation of China(11475202,11405187)Youth Innovation Promotion Association of Chinese Academy of Sciences(2015009)
文摘In an electron storage ring, the bunch length can be increased or decreased by using harmonic cavities. Taking the High Energy Photon Source as an example, we test the bunch length manipulation with harmonic cavities in a diffraction-limited storage ring （DLSR）. The most important collective effects in a DLSR, intra-beam scattering and Touschek effects, are evaluated for different bunch-length patterns. Our study shows that it is feasible to produce long and short bunches simultaneously in a DLSR, without causing severe emittance growth and reduction in lifetime.
基金This research was funded by the MICINN(programs Consolider Ingenio-2010:CSD2007-046-NanoLight.es,Plan Nacional FIS2009-0123:Optical NanoAntennas)the European Union(ERC Advanced Grant 247330-NanoAntennas)+2 种基金LP acknowledges financial support from the Marie-Curie International Fellowship COFUND and ICFOnest programFP received support from the European Commission through the Erasmus Mundus Joint Doctorate Programme Europhotonics(Grant No.159224-1-2009-1-FR-ERA MUNDUS-EMJD)DB acknowledges support from a Rubicon Grant of the Netherlands Organization for Scientific Research.
文摘Investigations of ultrafast processes occurring on the nanoscale require a combination of femtosecond pulses and nanometer spatial resolution.However,controlling femtosecond pulses with nanometer accuracy is very challenging,as the limitations imposed both by dispersive optics on the time duration of a pulse and by the spatial diffraction limit on the focusing of light must be overcome simultaneously.In this paper,we provide a universal method that allows full femtosecond pulse control in subdiffraction-limited areas.We achieve this aim by exploiting the intrinsic coherence of the second harmonic emission from a single nonlinear nanoparticle of deep subwavelength dimensions.The method is proven to be highly sensitive,easy to use,quick,robust and versatile.This approach allows measurements of minimal phase distortions and the delivery of tunable higher harmonic light in a nanometric volume.Moreover,the method is shown to be compatible with a wide range of particle sizes,shapes and materials,allowing easy optimization for any given sample.This method will facilitate the investigation of light–matter interactions on the femtosecond–nanometer level in various areas of scientific study.
