Polarization-sensitive photoresponse of nanographite
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We report on polarization-sensitive direct current photoresponse of nanographite films in a 532–4000 nm spectral range. It is found that irradiation of the nanographite by the nanosecond laser pulses produces the electric current with intensity depending on the incidence angle and polarization of the laser beam. The obtained dependencies of the photoresponse on wavelength and polarization of excitation laser beam are discussed in terms of the surface photogalvanic and photon drag effects.Keywords:
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Systematic theoretical calculations are presented investigating (a) the external excitation of resonances within a spherical droplet using a focused laser beam, (b) the internal excitation of resonances within a spherical droplet due to an embedded source, and (c) the effect of droplet nonsphericity on resonance excitation.
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Nanosecond dynamics of two separated discharge cycles in an asymmetric dielectric barrier discharge is studied using time-resolved current and voltage measurements synchronized with high-speed (∼5 ns) optical imaging. Nanosecond dc pulses with tailored raise and fall times are used to generate solitary filamentary structures (SFSs) during the first cycle and a uniform glow during the second. The SFSs feature ∼1.5 mm thickness, ∼1.9 A peak current, and a lifetime of several hundred nanoseconds, at least an order of magnitude larger than in common microdischarges. This can be used in alternating localized and uniform high-current plasma treatments in various applications.
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The authors report a new nanosecond-pulsed dielectric-barrier discharge (DBD) for sterilization and other medical applications. In the literature, several discharges have been reported, with pulse durations on the order of hundreds of nanoseconds. In this paper, a novel pulsed DBD has been developed, with only few tens of nanosecond pulsewidths working uniformly over large range of electrode gap distance in air under atmospheric pressure.
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It is studied that the dependence of the fluorescence conversion efficiency (FCE) on the excitation wavelength for two kinds of PAH in water and CH 2CL 2 respectively The results show that the optimum excitation wavelength and the FCE may be very different for the same PAH but in different solvate
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Photon storage with nanosecond switching was implemented with indirect excitons in coupled quantum well nanostructures. The storage and release of photons was controlled by the gate voltage pulses. The nanosecond write and readout times were much shorter than the storage time, which reached microseconds. Furthermore, the presented control of excitons on a time scale much shorter than the exciton lifetime demonstrates the feasibility of studying excitons in in situ controlled electrostatic traps.
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Nanosecond dynamics of two separated discharge cycles in an asymmetric dielectric barrier discharge is studied using time-resolved current and voltage measurements synchronized with high-speed (∼5 ns) optical imaging. Nanosecond dc pulses with tailored raise and fall times are used to generate solitary filamentary structures (SFSs) during the first cycle and a uniform glow during the second. The SFSs feature ∼1.5 mm thickness, ∼1.9 A peak current, and a lifetime of several hundred nanoseconds, at least an order of magnitude larger than in common microdischarges. This can be used in alternating localized and uniform high-current plasma treatments in various applications.
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