Single layer and double layer thin ZnO films with Ag nano-clusters on top and between them are fabricated by magnetron sputtering with subsequent annealing procedures. Transmission spectra measurements of the Ag/ZnO nanocomposite shows that a disordering (yet controllable) annealing modification, leads to a high transmission in the near- to the mid-IR spectral regimes. The spectra also show oscillations in the visible wavelength regime due to the excitation of surface plasmons that propagate along the surface of the nano-cluster. The behavior reported here is of interest for future implementation of new sub-wavelength, nanoplasmonic devices.
The PPLN crystal is combined with a set of DFB diodes and fiber amplifier to come up with a compact device that demonstrates high-stability output through near- to mid-IR range at repetition rate up to 500 kHz.
The history of resonance photonic crystals started with the pursuit for control over spontaneous decay in a photonic bandgap structure. Initiated by Bykov in optics, it was however implemented for the first time in the microwave domain by Yablonovitch et al. in 1991. This prediction of suppression of spontaneous emission of photons by a two-level atom turned into enhancement of optical nonlinearities, optical soliton generation and transport, and addressable light localization that is due to both structure and optically active defect created inside the crystal. This article reviews both fundamental theoretical ideas in the resonance photonic crystal with defect inside and selected experimental developments in the sense that reflects interests and expertise of the author.
We demonstrate and optimize, for a mJ/ns release, the operation of a compact laser system designed in the form of a hybrid Q-switched Nd3+:YAG/Cr4+:YAG microchip laser seeding an Yb-doped specialty (GTWave-based) fiber amplifier. A gain factor as high as ~25 dB is achieved for nanosecond single-mode pulses at a 1-10-kHz repetition rate as the result of optimization
We demonstrate and explain interesting dynamics of both a pair of gap solitons or a single gap soliton in a resonant photonic crystal whusing
both analytical and numerical methods. The most important result is the fact that we are able to show that the oscillating gap soliton created
either by the presence of an inversion inside the crystal or by the Bragg resonance mismatch can be manipulated by means of a proper choice
of bit rate, phase and amplitude modulation, or even by the resonance detuning We manage to obtain qualitatively different regimes of the
resonance photonic crystal operation. A noticeable observation is that both the delay time and amplitude difference must exceed a certain
level to ensure effective control over soliton dynamics. The modification of the defect that accomplishes the soliton trapping can make the
dynamics of N soliton trains in the resonant photonic crystal with defects even more interesting and is a subject of the future work.
We demonstrate interesting and previously unforeseen properties of a pair of gap solitons in a resonant photonic crystal which can be
predicted and explained in a physically transparent form using both analytical and numerical methods. The most important result is the fact
that we are able to show that the oscillating gap soliton created by the presence of an inversion inside the crystal can be manipulated by
means of a proper choice of bit rate, phase and amplitude modulation. Using this approach, we were able to obtain qualitatively different
regimes of the resonant photonic crystal operation. A noticeable observation is that both the delay time and amplitude difference must exceed
a certain level to ensure effective control over soliton dynamics. The modification of the defect that accomplishes the soliton trapping can
make the dynamics of N soliton trains in the resonant photonic crystal with defects even more interesting and is a subject of the future work.
Using Maxwell-Bloch equations, we analyze the response of a two-component medium of two-level atoms driven by a two-cycle
optical pulse beyond the traditional approach of slowly varying amplitudes and phases. We show that the notions of
carrier, envelope, phase and group velocities can be generalized to this situation, and that for optical pulses of a given
duration, the optical field can evolve into temporal few-cycle solitons.
We apply the quasiadiabatic approximation for the femtosecond pulse propagation in a collection of excitons in the case of weak interaction between the optical pulse and the semiconductor medium. Using the semiconductor Maxwell-Bloch equations beyond the slowly varying envelope approximation we show that the dynamics of femtosecond pulse propagation is described by the modified Korteweg-de Vries equation. Bright solitons superimposed on a continuous wave background are found and their stability against low amplitude perturbations is investigated. Possible experiments in semiconductor systems such as GaAs/AlGaAs are discussed.
The objective of this report is aimed on both theoretical and experimental study of second harmonic generation at light reflection by a metal surface. The theory includes the effect of spatial dispersion, and the experiment exploits Nd:YAG laser to probe silver, gold, and copper sample. The comparative analysis shows nice agreement between the experimental data and results given by the theory developed here.
The scaling theory is exploited for a cw chain HF laser initiated by a stationary detonation wave. This provides us with a fast and accurate method of estimating the output parameters of the laser at different compositions of the initial mixture. The comparative analysis to numerical simulation is performed and demonstrates a reasonable degree of accuracy using our method.