F. Persico - Academia.edu (original) (raw)
Papers by F. Persico
Journal of the Optical Society of America B, 2013
We present the results of experimental and theoretical studies of high-order harmonic generation ... more We present the results of experimental and theoretical studies of high-order harmonic generation (HHG) in plasmas containing fullerenes using pulses of different duration and wavelength. We find that the harmonic cutoff is extended in the case of few-cycle pulses (3.5 fs, 29th harmonic) compared to longer laser pulses (40 fs, 25th harmonic) at the same intensity. Our studies also include HHG in fullerenes using 1300 and 780 nm multicycle (35 and 40 fs) pulses. For 1300 nm pulses, an extension of the harmonic cutoff to the 41st order was obtained, with a decrease in conversion efficiency that is consistent with theoretical predictions based on wave packet spreading for single atoms. Theoretical calculations of fullerene harmonic spectra using the single active electron approximation were carried out for both few-cycle and multicycle pulses. © 2012 Optical Society of America OCIS codes: 190.4160, 190.4180. 780 nm and pulse duration 8 ps was split from the beam line Ganeev et al.
Physical Review A, 2012
ABSTRACT We discuss the physical properties of a noninteracting electron gas constrained to a sph... more ABSTRACT We discuss the physical properties of a noninteracting electron gas constrained to a spherical surface. In particular we consider its chemical potentials, its ionization potential, and its electric static polarizability. All these properties are discussed analytically as functions of the number N of electrons. The trends obtained with increasing N are compared with those of the corresponding properties experimentally measured or theoretically evaluated for quasispherical hollow atomic and molecular clusters. Most of the properties investigated display similar trends, characterized by a prominence of shell effects. This leads to the definition of a scale-invariant distribution of magic numbers which follows a power law with critical exponent −0.5. We conclude that our completely mechanistic and analytically tractable model can be useful for the analysis of self-assembling complex systems.
Physical Review A, 2013
ABSTRACT The time-dependent wave function of a nanoring driven by a laser field is obtained by ex... more ABSTRACT The time-dependent wave function of a nanoring driven by a laser field is obtained by exploiting the symmetries inherent to the system and used for studying the properties of the electromagnetic radiation emitted by the nanoring as a function of the polarization state of the laser. The diffused radiation has the characteristics of high-order-harmonic generation. For a noncircularly polarized laser field an extension of the expected cutoff position is evident, indicating that nanorings are efficient sources of radiation. The polarization state of the emitted harmonics can be opportunely controlled by varying the parameters of the pump field. The profile of the absorbed angular moment shows that a magnetic moment can be induced depending on the polarization of the driven field.
Physical Review B, 1978
ABSTRACT
Physics Letters A, 1995
ABSTRACT
Optics Communications, 1983
ABSTRACT
Journal of Physics B: Atomic, Molecular and Optical Physics, 1999
ABSTRACT
Physical review. A, 1985
A spinless, nonrelativistic hydrogen atom coupled to an electromagnetic field is considered. The ... more A spinless, nonrelativistic hydrogen atom coupled to an electromagnetic field is considered. The interaction is taken in the minimal-coupling form, and the ground state of the coupled system is obtained by straightforward perturbation theory. The form of the cloud of virtual photons surrounding the atom is studied through the quantum-mechanical average on this state of an appropriately defined coarse-grained energy-density
Physical Review A, 1988
Half-dressed sources are defined as sources deprived partially or totally of the cloud of virtual... more Half-dressed sources are defined as sources deprived partially or totally of the cloud of virtual quanta which surrounds them in the ground state of the total system. Two models of a half-dressed point source S are considered, the first in the framework of the theory of massive scalar fields and the second in quantum electrodynamics (QED). In both cases the
Il Nuovo Cimento D, 1993
Summary It is shown that Van Hove theory of quantum fields, based on the analytic properties of ... more Summary It is shown that Van Hove theory of quantum fields, based on the analytic properties of the resolvent operator, is capable of describing a kind of non-equilibrium QED states known as partially dressed states. This result is obtained by investigating the resolvent description of the time development of the bare ground state of the two-level atom radiation Hamiltonian using the
Physics Letters A, 1985
The possibility of interference effects between the clouds of two ground-state hydrogen atoms at ... more The possibility of interference effects between the clouds of two ground-state hydrogen atoms at large distances is considered. It is shown that no interference is present in the quantum average of the coarse-grained energy density operator at O(e2). Interference between the two clouds is shown to take place at O(e4).
Coherence and Quantum Optics VI, 1989
Physics Letters A, 2006
We consider three two-level atoms inside a one-dimensional cavity, interacting with the electroma... more We consider three two-level atoms inside a one-dimensional cavity, interacting with the electromagnetic field in the rotating wave approximation (RWA), commonly used in the atom-radiation interaction. One of the three atoms is initially excited, and the other two are in their ground state. We numerically calculate the propagation of the field spontaneously emitted by the excited atom and scattered by the second atom, as well as the excitation probability of the second and third atom. The results obtained are analyzed from the point of view of relativistic causality in the atom-field interaction. We show that, when the RWA is used, relativistic causality is obtained only if the integrations over the field frequencies are extended to −∞; on the contrary, noncausal tails remain even if the number of field modes is increased. This clearly shows the limit of the RWA in dealing with subtle problems such as relativistic causality in the atom-field interaction.
Atom-Field Interactions and Dressed Atoms, 1995
Atom-Field Interactions and Dressed Atoms, 1995
Atom-Field Interactions and Dressed Atoms, 1995
Atom-Field Interactions and Dressed Atoms, 1995
Journal of the Optical Society of America B, 2013
We present the results of experimental and theoretical studies of high-order harmonic generation ... more We present the results of experimental and theoretical studies of high-order harmonic generation (HHG) in plasmas containing fullerenes using pulses of different duration and wavelength. We find that the harmonic cutoff is extended in the case of few-cycle pulses (3.5 fs, 29th harmonic) compared to longer laser pulses (40 fs, 25th harmonic) at the same intensity. Our studies also include HHG in fullerenes using 1300 and 780 nm multicycle (35 and 40 fs) pulses. For 1300 nm pulses, an extension of the harmonic cutoff to the 41st order was obtained, with a decrease in conversion efficiency that is consistent with theoretical predictions based on wave packet spreading for single atoms. Theoretical calculations of fullerene harmonic spectra using the single active electron approximation were carried out for both few-cycle and multicycle pulses. © 2012 Optical Society of America OCIS codes: 190.4160, 190.4180. 780 nm and pulse duration 8 ps was split from the beam line Ganeev et al.
Physical Review A, 2012
ABSTRACT We discuss the physical properties of a noninteracting electron gas constrained to a sph... more ABSTRACT We discuss the physical properties of a noninteracting electron gas constrained to a spherical surface. In particular we consider its chemical potentials, its ionization potential, and its electric static polarizability. All these properties are discussed analytically as functions of the number N of electrons. The trends obtained with increasing N are compared with those of the corresponding properties experimentally measured or theoretically evaluated for quasispherical hollow atomic and molecular clusters. Most of the properties investigated display similar trends, characterized by a prominence of shell effects. This leads to the definition of a scale-invariant distribution of magic numbers which follows a power law with critical exponent −0.5. We conclude that our completely mechanistic and analytically tractable model can be useful for the analysis of self-assembling complex systems.
Physical Review A, 2013
ABSTRACT The time-dependent wave function of a nanoring driven by a laser field is obtained by ex... more ABSTRACT The time-dependent wave function of a nanoring driven by a laser field is obtained by exploiting the symmetries inherent to the system and used for studying the properties of the electromagnetic radiation emitted by the nanoring as a function of the polarization state of the laser. The diffused radiation has the characteristics of high-order-harmonic generation. For a noncircularly polarized laser field an extension of the expected cutoff position is evident, indicating that nanorings are efficient sources of radiation. The polarization state of the emitted harmonics can be opportunely controlled by varying the parameters of the pump field. The profile of the absorbed angular moment shows that a magnetic moment can be induced depending on the polarization of the driven field.
Physical Review B, 1978
ABSTRACT
Physics Letters A, 1995
ABSTRACT
Optics Communications, 1983
ABSTRACT
Journal of Physics B: Atomic, Molecular and Optical Physics, 1999
ABSTRACT
Physical review. A, 1985
A spinless, nonrelativistic hydrogen atom coupled to an electromagnetic field is considered. The ... more A spinless, nonrelativistic hydrogen atom coupled to an electromagnetic field is considered. The interaction is taken in the minimal-coupling form, and the ground state of the coupled system is obtained by straightforward perturbation theory. The form of the cloud of virtual photons surrounding the atom is studied through the quantum-mechanical average on this state of an appropriately defined coarse-grained energy-density
Physical Review A, 1988
Half-dressed sources are defined as sources deprived partially or totally of the cloud of virtual... more Half-dressed sources are defined as sources deprived partially or totally of the cloud of virtual quanta which surrounds them in the ground state of the total system. Two models of a half-dressed point source S are considered, the first in the framework of the theory of massive scalar fields and the second in quantum electrodynamics (QED). In both cases the
Il Nuovo Cimento D, 1993
Summary It is shown that Van Hove theory of quantum fields, based on the analytic properties of ... more Summary It is shown that Van Hove theory of quantum fields, based on the analytic properties of the resolvent operator, is capable of describing a kind of non-equilibrium QED states known as partially dressed states. This result is obtained by investigating the resolvent description of the time development of the bare ground state of the two-level atom radiation Hamiltonian using the
Physics Letters A, 1985
The possibility of interference effects between the clouds of two ground-state hydrogen atoms at ... more The possibility of interference effects between the clouds of two ground-state hydrogen atoms at large distances is considered. It is shown that no interference is present in the quantum average of the coarse-grained energy density operator at O(e2). Interference between the two clouds is shown to take place at O(e4).
Coherence and Quantum Optics VI, 1989
Physics Letters A, 2006
We consider three two-level atoms inside a one-dimensional cavity, interacting with the electroma... more We consider three two-level atoms inside a one-dimensional cavity, interacting with the electromagnetic field in the rotating wave approximation (RWA), commonly used in the atom-radiation interaction. One of the three atoms is initially excited, and the other two are in their ground state. We numerically calculate the propagation of the field spontaneously emitted by the excited atom and scattered by the second atom, as well as the excitation probability of the second and third atom. The results obtained are analyzed from the point of view of relativistic causality in the atom-field interaction. We show that, when the RWA is used, relativistic causality is obtained only if the integrations over the field frequencies are extended to −∞; on the contrary, noncausal tails remain even if the number of field modes is increased. This clearly shows the limit of the RWA in dealing with subtle problems such as relativistic causality in the atom-field interaction.
Atom-Field Interactions and Dressed Atoms, 1995
Atom-Field Interactions and Dressed Atoms, 1995
Atom-Field Interactions and Dressed Atoms, 1995
Atom-Field Interactions and Dressed Atoms, 1995