Autocorrelationљpart of the set-up divides the input pulse into two identical replicas, and then one of them goes through a variable delay line. Afterwards both pulse replicas are set parallel and thenљfocused into the same spot of the nonlinear crystal of BBO. As a result, second harmonic is produced along the bisector of the angle between fundamental pulses. The measured signal is the intensity of second harmonic at the dc and photoelasticљmodulator frequencyљvs. time delay.
Research
Optical metamaterials represent specially designed structures, which possess optical properties not observable for ordinary bulk medium. Due to special geometry of meta-atoms their optical response can lead to curious phenomena like optical magnetism or negative refractive index. It was shown recently that depending on their unique properties metamaterials can be used for creating so called superlenses, optical cloaking and all-optical switching.
Surface plasmon-polaritons (SPPs) is a collective oscillation of light and electrons that propagate at the boundary between metal and dielectric. The lifetime of such excitations can vary from few femtoseconds till picoseconds in the optical range of spectrum. Since the development of femtosecond lasers became possible to study and to use this ultrafast processes in devices and applications.љ
Research joined under the name ?Nanophotonics of surface states in photonic crystals?, carried out in the laboratory, are aimed to the study of properties of surface electromagnetic waves (SEWs), Tamm plasmon polaritons (TPPs), guided modes, which arise inside or at the surface of photonic crystals.
Optical tweezers is the most convenient and widespread technique for spatial localization and manipulation of particles with dimensions of a few microns or less. To date, optical tweezers have developed into a powerful tool in atom optics, statistical physics, molecular biology, biochemistry, and biophysics.