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1.
A. M. Zheltikov 《Optics and Spectroscopy》2002,93(2):286-290
A harmonic oscillator model is used to demonstrate the possibility of coherent control of acoustic vibrations of metal nanoparticles and thin films with sequences of femtosecond laser pulses. When the interval between the pulses in such a sequence is chosen equal to the oscillation period of the expansion mode of a nanoscale system, the relevant acoustic vibrations can be excited in a resonant and selective way. Sequences of femtosecond pulses with picosecond time intervals between the pulses are shown to be ideally suited for a resonant excitation and coherent control of acoustic modes of silver nanoparticles. 相似文献
2.
Lanin AA Voronin AA Sokolov VI Fedotov IV Fedotov AB Akhmanov AS Panchenko VY Zheltikov AM 《Optics letters》2011,36(10):1788-1790
Slow-light effects induced by stimulated Raman scattering in polymer waveguides on a printed circuit board are shown to enable a widely tunable delay of broadband optical signals, suggesting an advantageous platform for optical information processing and ultrafast optical waveform transformation. 相似文献
3.
S. O. Konorov E. E. Serebryannikov A. A. Ivanov D. A. Akimov M. V. Alfimov A. M. Zheltikov 《JETP Letters》2004,79(9):395-398
Hollow-core photonic-crystal fibers with a special dispersion profile are shown to allow phase-matched nonlinear optical interactions of isolated air-guided modes of high-intensity femtosecond laser pulses confined in the hollow fiber core. We present theoretical and experimental studies of the four-wave mixing of fundamental and second-harmonic pulses of a Cr:forsterite laser with an initial pulse duration of about 50 fs and an intensity on the order of 1014 W/cm2 in waveguide modes of a hollow photonic-crystal fiber with a core diameter of about 13μm. 相似文献
4.
Akimov DA Fedotov AB Koroteev NI Naumov AN Sidorov-Biryukov DA Zheltikov AM Miles RB 《Optics letters》1999,24(7):478-480
An experimental technique based on coherent one-dimensional hyper-Raman-resonant four-wave mixing in broad cylindrically focused light beams has been developed for line-by-line imaging of spatial distribution of excited atoms in a low-temperature plasma of optical breakdown. The technique was applied to map excited lead atoms in a low-temperature laser-produced plasma. 相似文献
5.
Scalora M Syrchin MS Akozbek N Poliakov EY D'Aguanno G Mattiucci N Bloemer MJ Zheltikov AM 《Physical review letters》2005,95(1):013902
A new generalized nonlinear Schr?dinger equation describing the propagation of ultrashort pulses in bulk media exhibiting frequency dependent dielectric susceptibility and magnetic permeability is derived and used to characterize wave propagation in a negative index material. The equation has new features that are distinct from ordinary materials (mu=1): the linear and nonlinear coefficients can be tailored through the linear properties of the medium to attain any combination of signs unachievable in ordinary matter, with significant potential to realize a wide class of solitary waves. 相似文献
6.
L.A. Golovan L.P. Kuznetsova A.B. Fedotov S.O. Konorov D.A. Sidorov-Biryukov V.Y. Timoshenko A.M. Zheltikov P.K. Kashkarov 《Applied physics. B, Lasers and optics》2003,76(4):429-433
Third-harmonic generation (THG) in reflection geometry was studied in nanostructured silicon layers grown by electrochemical
porosifying of p-type (110) silicon substrates. An order of magnitude enhancement of the THG efficiency compared to crystalline
silicon (c-Si) was observed for the samples prepared on a highly doped substrate, whereas for the samples grown on a low-doped
substrate the THG was much less efficient than for c-Si. The finding is discussed in terms of fluctuations of the electric
field of the pump-laser irradiation in the layers of anisotropically distributed silicon nanocrystals.
Received: 26 July 2002 / Revised version: 9 January 2003 / Published online: 3 April 2003
RID="*"
ID="*"Corresponding author. Fax: +7-95/939-1566, E-mail: leo@vega.phys.msu.su 相似文献
7.
Thekth-order asymptotic solution of a standard system with lag is constructed along trajectories calculated according to the averaging scheme of A. N. Filatov. If the perturbation parameter 1, then the use of the step method for finding the solution is connected with cumbersome calculations because the number of required steps is inversely proportional to . We suggest another approach in which the step method is used onlyk times fort [0,k] and justify the asymptotic method.Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 46, No. 10 pp. 1362–1368, October, 1994. 相似文献
8.
Voronin AA Fedotov IV Doronina-Amitonova LV Ivashkina OI Zots MA Fedotov AB Anokhin KV Zheltikov AM 《Optics letters》2011,36(4):508-510
Light-assisted ionization accompanying coherent anti-Stokes Raman scattering (CARS) of ultrashort laser pulses in brain tissue is shown to manifest itself in a detectable blueshift of the anti-Stokes signal. This blueshift can serve as an indicator of ionization processes in CARS-based neuroimaging. 相似文献
9.
M. V. Alfimov A. M. Zheltikov A. A. Ivanov V. I. Beloglazov B. A. Kirillov S. A. Magnitskii A. V. Tarasishin A. B. Fedotov L. A. Mel’nikov N. B. Skibina 《JETP Letters》2000,71(12):489-492
The physical principles of photonic-crystal fibers with a photonic band gap tunable in the visible and near-IR spectral ranges are demonstrated. Direct numerical integration of the Maxwell equations with the use of the finite-difference time-domain technique reveals the possibility of creating holey fibers with a photonic-crystal cladding whose photonic band gap lies within the frequency range characteristic of widespread solid-state femtosecond lasers. The fabrication of holey fibers with a pitch of the two-dimensional periodic structure of the cladding less than 500 nm allowed us to experimentally observe a photonic band gap in transmission spectra of holey fibers tunable within the range of 930–1030 nm. This photonic band gap is satisfactorily described within the framework of the proposed numerical approach based on the finite-difference time-domain method. 相似文献
10.
A. N. Naumov F. Giammanco D. A. Sidorov-Biryukov A. B. Fedotov P. Marsili A. Ruffini A. M. Zheltikov 《JETP Letters》2001,73(6):263-267
Coherent four-wave mixing (FWM) of laser pulses in gas-filled hollow fibers is studied. The experimental data and the expressions derived for the amplitude of the FWM signal indicate that the excitation of higher order waveguide modes is an important physical factor having a considerable influence on nonlinear optical processes in hollow fibers. 相似文献