A5041246838- Laser Material Processing Techniques
- Plasmonic and Surface Plasmon Research
- Quantum optics and atomic interactions
- Spectroscopy and Quantum Chemical Studies
- Laser Design and Applications
- Surface Roughness and Optical Measurements
- Phase-change materials and chalcogenides
- Ocular and Laser Science Research
- Random lasers and scattering media
- Advanced Memory and Neural Computing
- Photorefractive and Nonlinear Optics
- Metamaterials and Metasurfaces Applications
- Laser-Ablation Synthesis of Nanoparticles
- Transition Metal Oxide Nanomaterials
- Optical Polarization and Ellipsometry
- Chalcogenide Semiconductor Thin Films
- Photonic Crystals and Applications
- Orbital Angular Momentum in Optics
- Mechanical and Optical Resonators
- Nonlinear Optical Materials Studies
- Gold and Silver Nanoparticles Synthesis and Applications
- stochastic dynamics and bifurcation
- Magneto-Optical Properties and Applications
- Advanced Antenna and Metasurface Technologies
- nanoparticles nucleation surface interactions
University of Eastern Finland
2019-2024
Udmurt Federal Research Center, Ural Branch of the Russian Academy of Sciences
2016-2023
N.N. Krasovskii Institute of Mathematics and Mechanics of the Ural Branch of the Russian Academy of Sciences
2017
Ural Branch of the Russian Academy of Sciences
2014-2016
Russian Academy of Sciences
2011-2015
Photon drag effect (PDE) and surface photogalvanic (SPGE) can be observed in centrosymmetric media manifest themselves photocurrents, the magnitude polarity of which depend on wavevector polarization excitation laser beam. PDE photocurrent originates from transfer photon momentum to a free charge carrier, while SPGE is due diffuse scattering photoexcited carriers subsurface layer. However, despite different underlying physical mechanisms, these photocurrents have almost indistinguishable...
Tunability of properties is one the most important features 2D materials, among which graphene attracting attention due to wide variety its possible applications. Here, we demonstrated that carrier concentration in can be efficiently tuned by material dielectric substrate on it resides. To this end, fabricated samples CVD-grown transferred onto silicon wafers covered with alumina, titanium dioxide, and dioxide. We measured transmission spectra these using a time-domain terahertz spectrometer...
It is shown that in resistive Ag/Pd films manufactured according to the thick-film technology, case of oblique incidence laser radiation nanosecond duration at a wavelengths 1350 – 2100 nm, photon-drag photocurrent arises direction perpendicular plane incidence, dependent on ellipticity and sign circular polarisation incident radiation. This consists so-called linear contributions, which are, respectively, independent polarisation. In this wavelength range, amplitude contribution many times...
We report on the observation of helicity-dependent photoresponse 20-μm-thick silver–palladium (Ag/Pd) nanocomposite films. In experiment, 120 fs pulses Ti:S laser induced in film an electric current perpendicular to incidence plane. The photoinduced is a linear function incident beam power, and its sign depends polarization angle incidence. particular, zero for p- s-polarized beams, while opposite right- left-circularly polarized beams. By comparing experimental results with theoretical...
We report excitation of the spin-polarized currents in CuSe nanocrystalline films and demonstrate that inversion photon helicity reverses direction photocurrent propagating perpendicular to plane incidence. By performing measurements both along incidence, we show observed originate from circular surface photogalvanic effect (C-SPGE). In contrast conventional effect, which is associated with spin–orbit interaction can be gyrotropic media, C-SPGE originates scattering charge carriers on...
We performed the investigation of polarization-sensitive photocurrent generated in silver-palladium metal-semiconductor nanocomposite films under irradiation with nanosecond laser pulses at wavelength 2600 nm. It is shown that both transverse and longitudinal configuration, surface photogalvanic (SPGE) photon drag effects (PDE) contribute to observed photocurrent. However, temporal profile pulse monopolar any polarization angle incidence, while depends on excitation beam. Specifically, film...
We report the performance of a graphene-enhanced THz grating fabricated by depositing gold layer on femtosecond micromachined SiO2 substrate. The morphology plated patterned substrate was studied scanning electron microscopy (SEM) and atomic force (AFM), while quality chemical vapor deposition (CVD) graphene evaluated Raman spectroscopy. electromagnetic (EM) response metasurface comprising sheet time domain spectroscopy in 100 GHz-1 frequency range. employed finite elements method (FEM) to...
We demonstrate that the transverse polarization-sensitive photoresponse of CuSe/Se nanocomposite film deposited on a transparent substrate depends whether is irradiated from air side or side. In particular, nanosecond photocurrent pulse either bipolar unipolar depending which interface beam hits first. The observed phenomenon can be described in terms interplay between counter-propagating photocurrents generated at air/nanocomposite and substrate/nanocomposite interfaces due to surface...
Polarization influence on the photovoltaic current raised due to photon-drag effect in single-walled carbon nanotube (SWNT) films and nanostructured silver-palladium (Ag/Pd) resistive is examined at wavelengths of 532 1064 nm nanosecond laser pulses. The SWNT were synthesized by aerosol chemical vapor deposition technique. Ag/Pd films, consisting AgPd alloy palladium oxide (PdO), prepared burning a special paste ceramic substrate. obtained characterized Raman spectroscopy. It shown that...
This study explores the influence of geometric variations on electromagnetic response a graphene-enhanced grating in terahertz frequency range, view supporting development high-performing passive devices for advanced applications. The investigation is addressed by performing Terahertz Time-Domain Spectroscopy (TTDS) measurements, which dimension grating's geometry and thickness gold reflector vary according to factorial design. analysis provides insights into interplay between metamaterial...
An experimental approach for the direct measurement of circular photocurrent (CPC) has been developed. The method was tested measuring CPC due to photon drag effect in Ag/Pd nanocomposites film a wide spectral range. Measurements were performed at wavelengths 266, 532, and 1064 nm. results compared with those obtained by indirect conventional scheme. open new possibility application determine direction electric field vector rotation elliptically polarized light.
We propose a method of spatial resolution enhancement in metrology (thermometry, magnetometry, pH estimation and similar methods) with blinking fluorescent nanosensors by combining sensing super-resolution optical fluctuation imaging (SOFI). To demonstrate efficiency this approach, model experiment laser diodes modeling fluctuating nanoemitters intentional blurring the image is performed. The 2nd, 3rd, 4th order cumulant images provide improvement contrast enable successful reconstruction...
This work reports on a circular photocurrent in Ag/Pd nanocomposite films. The films, containing metal (Ag‐Pd) and semiconductor (PdO) nanocrystallites amorphous lead‐silicate glass, are modified by electrochemical hydrogenation sulfuric acid solution. the films is excited nanosecond laser pulses at wavelengths of 532, 1064, 1550 nm. In order to determine linear contributions transverse photocurrent, dependences degree polarization exciting radiation investigated. It found that modification...
We report on the observation of helicity dependent photocurrent 20 μm thick silver-palladium (Ag/Pd) films manufactured by thick-film technology. The transverse is observed at oblique incidence laser radiation with different wavelengths in spectral range 266 - 2100 nm. At wavelength 532 nm polarity positive (negative) for left- (right-) circular polarized beam. show that action high temperature vacuum results decrease longitudinal due to reduction PdO content. photon drag effect suggested be...
ВЛИЯНИЕ ТЕМПЕРАТУРНОГО ВОЗДЕЙСТВИЯ В ВАКУУМЕ НА
Abstract The results of investigation the shapes polarization-sensitive photocurrent pulses in nanocomposite Ag/Pd films with different temperatures firing are presented. were produced accordance thick film technology at T = 773 and 1013 K. Photocurrent excitation was carried out by femtosecond laser pulses. obtained polarization dependencies characteristic for due to photon drag surface photogalvanic effects. It shown that longitudinal pulse duration K (26 ns) is significantly longer than (3 ns).