A concept of the remotely actuated and interrogated four-wave mixing photonic sensor, which employs the negative-index photonic materials, is described. Unique electromagnetic properties of such a metamaterial enable enhancement of frequency conversion and redirection of the signals which carry important information for environmental probing. Four-wave mixing process allows for independent engineering of resonantly enhanced optical nonlinearities and negative refractive index.
A concept of a family of unique backward-wave photonic devices, such as frequency up and down converting nonlinear-optical mirrors, sensors, modulators, filters and amplifiers is proposed. Novel materials are considered, which support coexistence of ordinary and backward waves and thus enable enhanced nonlinear-optical frequency conversion processes. Particular properties of short-pulse regime are investigated.
The feasibilities and specific features of coherent nonlinear-optical energy transfer from control fields to a negativephase
signal are studied, and they are found to stem from the backwardness of electromagnetic waves inherent
to negative-index metamaterials. Plasmonic metamaterials that possess negative group velocity for light waves
promise a revolutionary breakthrough in nanophotonics. However, strong absorption inherent to such metaldielectric
nanocomposites imposes severe limitations on the majority of such applications. Herein we show the
feasibility and discuss different nonlinear-optical techniques of compensating such losses, producing transparency,
amplification and even generation of negative-phase light waves in originally strongly absorbing microscopic
samples of plasmonic metal-dielectric nanostructured composites.
The effect of electromagnetically induced transparency on the spectrum of defect modes of one-dimensional photonic
crystal is discussed theoretically. Narrowing of defect mode linewidth is predicted due to nonabsorbing highly dispersive
medium in defect layer.
The polarized transmission spectra of the one-dimensional photonic crystal with a planar aligned nematic liquid crystal
defect layer have been studied theoretically and experimentally. An effect ofthe oblique incidence ofthe light, as well as
the temperature of the defect layer, on the spectral positions of the defect modes has been investigated. It is shown that
an increase of the incidence angle results in the shift of the defect modes to short-wave range and this tendency appears
more pronounced for TM polarization. The spectral shift of the defect modes at 20 nm due to the change of refractive
index of the liquid crystal at heating to the isotropic phase was exhibited. The theoretical dependencies of transmission
spectra ofphotonic crystal under study agree well with the experimental data.
Interactive numerical simulator, based on MATLAB/SIMULINK platform, for virtual experimentation and optimization of frequency tunable optically pumped dimer laser has been created. Nonperturbative theory considering features of quantum coherence and interference effects at Doppler broadened transitions under two strong driving fields accounting for collisions and other kinetic processes in vapor-gas mixture as well as for propagation effects in optically thick medium is developed. The results are in good agreement with real experiments.
We theoretically study cw two-photon resonant four-wave mixing process (formula available in paper) when fundamental radiation with frequencies (formula available in paper) are strong enough and lead to coherent population trapping (CPT). It is shown that under conditions of CPT, the linear and nonlinear polarization can be the same order. Efficient nonlinear frequency conversion in atomic Ba vapor in cw regime is demonstrated.
The possibility of elimination of Doppler broadening and simultaneous coherent coupling of atoms from wide velocity intervals in three-photon schemes is shown. A simple physical analysis in terms of modification of frequency- correlation properties of multiphoton processes in strong fields is given. Numerical illustrations are presented.
We study resonant four-wave mixing process (omega) 4 equals (omega) 1 minus (omega) 2 plus (omega) 3 under conditions of coherent population trapping (CPT) when radiations with frequencies (omega) 1,2 are strong, and (omega) 1 minus (omega) 2 equals (omega) 20 ((omega) 20 is a frequency of electrodipole-forbidden transition). It is shown that under the CPT sufficiently large nonlinear polarization (the same as linear polarization or higher) may be created. We show that in atomic Ba vapor for cw lasers quantum conversion efficiency can be as high as several tens percent.
Dynamic orientation of anisotropic molecules in a gas-phase medium under the action of laser pulses of a duration shorter than the rotation relaxation time has been studied both theoretically and experimentally. The effect was observed in the VUV third-harmonic generation in naphthalene vapor. The peculiarities of nonlinear optical UV and VUV generation (by frequency mixing of Nd-laser radiation) in the vapors of some compounds are studied.
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