@incollection{WeichertGasparZybinetal.2010, author = {Weichert, F. and Gaspar, M. and Zybin, A. and Gurevich, E. L. and G{\"o}rtz, A. and Timm, C. and M{\"u}ller, H. and Marwedel, P.}, title = {Plasmonen-unterst{\"u}tzte Mikroskopie zur Detektion von Viren}, series = {Bildverarbeitung f{\"u}r die Medizin 2010}, booktitle = {Bildverarbeitung f{\"u}r die Medizin 2010}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-642-11967-5}, year = {2010}, language = {en} } @article{AstrovKozlovLodyginetal.2009, author = {Astrov, Yu. A. and Kozlov, V. A. and Lodygin, A. N. and Portsel, L. M. and Shuman, V. B. and Gurevich, E. L. and Hergenr{\"o}der, R.}, title = {Redistribution of deep selenium and sulfur impurities in silicon upon surface doping with phosphorus}, series = {Semiconductors}, volume = {43}, journal = {Semiconductors}, issn = {1063-7826}, doi = {10.1134/S1063782609060049}, pages = {710 -- 715}, year = {2009}, abstract = {The study is concerned with the effect of short-term high-temperature heating on Si:Se and Si:S samples, whose surface layers are doped with phosphorus to high concentrations. It is found that the resistivity of the wafers substantially increases deep in the bulk within up to similar to 10 mu m. The experimental data suggest that this effect is due to enhanced diffusion of chalcogen in the presence of the phosphorus-doped surface region. The mechanism of the effect is the injection of nonequilibrium interstitial silicon atoms from the layer heavily doped with phosphorus to the bulk of the sample. This results in a shift of the equilibrium between the concentrations of substitutional and interstitial impurity atoms towards higher concentrations of interstitials and, as a consequence, towards the increase in the relative content of the fast-diffusing interstitial component of the impurity.}, language = {en} } @article{GurevichHergenroeder2009, author = {Gurevich, E. L. and Hergenr{\"o}der, R.}, title = {The production of free-standing large aspect ratio metal nanofilms by femtosecond laser separation}, series = {Nanotechnology}, volume = {20}, journal = {Nanotechnology}, issn = {0957-4484}, doi = {10.1088/0957-4484/20/27/275609}, pages = {275609}, year = {2009}, abstract = {We demonstrate a new method for the production of free-standing metal films of thickness down to several tens of nanometres. Films of different metals as well as multilayer structures have been produced by means of femtosecond laser-induced separation of evaporated layers from a plane glass surface. This technology enables the production of large-area films with different properties for optical or nanotechnological applications. We study the properties of the film and demonstrate the possibility of high-pass filtering of electrons with an energy of several keV by means of the free-standing films. The physical mechanisms leading to the film separation under femtosecond laser radiation are discussed.}, language = {en} } @article{MonticelliGurevichHergenroeder2009, author = {Monticelli, D. and Gurevich, E. L. and Hergenr{\"o}der, R.}, title = {Design and performances of a cyclonic flux cell for laser ablation}, series = {J. An. At. Spectr.}, volume = {24}, journal = {J. An. At. Spectr.}, issn = {0267-9477}, doi = {10.1039/b807991a}, pages = {328 -- 335}, year = {2009}, abstract = {A new simple design of a high-efficiency low-transport-time cell for laser ablation is presented. The main feature of the design is that the particles are transported by a laminar spiral gas flow into the outlet without any contact with the cell walls. The efficiency of the particle transport and the dependence of the ICP-MS peak shape on experimental conditions were measured. The peak duration on the 10\% level was found to be as short as 30 ms and the transport efficiency reached 100\% when analysing a standard brass sample. As an example of application to real samples with fine inhomogeneities, the profiles of C-13, Ca-44 and Pb-208 were measured by LA-ICP-MS across a tree core. As a result, the very quick particle transport time of the cell enabled the fine, seasonal variation in wood composition to be resolved.}, language = {en} } @article{ThomasLinZhigileietal.2009, author = {Thomas, D. A. and Lin, Z. and Zhigilei, L. V. and Gurevich, E. L. and Kittel, S. and Hergenr{\"o}der, R.}, title = {Atomistic modeling of femtosecond laser-induced melting and atomic mixing in Au film - Cu substrate system}, series = {Appl. Surf. Sci.}, volume = {255}, journal = {Appl. Surf. Sci.}, issn = {0169-4332}, doi = {10.1016/j.apsusc.2009.04.079}, pages = {9605 -- 9612}, year = {2009}, abstract = {The mechanisms of femtosecond laser-induced transient melting and atomic mixing in a target composed of a 30 nm Au film deposited on a bulk Cu substrate are investigated in a series of atomistic simulations. The relative strength and the electron temperature dependence of the electron-phonon coupling of the metals composing the layered target are identified as major factors affecting the initial energy redistribution and the location of the region(s) undergoing transient melting and resolidification. The higher strength of the electron-phonon coupling in Cu, as compared to Au, results in a preferential sub-surface heating and melting of the Cu substrate, while the overlaying Au film largely retains its original crystalline structure. The large difference in the atomic mobility in the transiently melted and crystalline regions of the target makes it possible to connect the final distributions of the components in the resolidified targets to the history of the laser-induced melting process, thus allowing for experimental verification of the computational predictions. (C) 2009 Elsevier B. V. All rights reserved.}, language = {en} } @article{GurevichHergenroeder2007, author = {Gurevich, E. L. and Hergenr{\"o}der, R.}, title = {A simple laser ICP-MS ablation cell with wash-out time less than 100 ms}, series = {J. An. At. Spectr.}, volume = {22}, journal = {J. An. At. Spectr.}, issn = {0267-9477}, doi = {10.1039/b704700b}, pages = {1043 -- 1050}, year = {2007}, abstract = {In this paper a novel concept of ablation cell for laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is presented. Suppression of the turbulence in the flush gas flow in the ablation region reduces the wash-out time of the ablation cell considerably. An ablation chamber which enables ICP-MS pulse duration down to several ten milliseconds has been designed. Dependence of the ICP-MS peak amplitude, width, and shape on the gas flow parameters is studied experimentally for aerosol ablated under laminar and turbulent conditions. Experiments demonstrate that the ICP-MS peak becomes sharper and the amplitude of the signal grows as the turbulence in the ablation cell is suppressed. Furthermore, the possibility of the LA-ICP-MS analysis with a sampling rate of more than 10 Hz has been demonstrated. Express in-depth profiling in the new ablation cell is demonstrated on examples of an Al -Zn multilayer structure and an industrial Mg -Zn coating.}, language = {en} } @article{GurevichHergenroeder2007, author = {Gurevich, E. L. and Hergenr{\"o}der, R.}, title = {Femtosecond laser-induced breakdown spectroscopy: Physics, applications, and perspectives}, series = {Appl. Spectroscopy}, volume = {61}, journal = {Appl. Spectroscopy}, issn = {0003-7028}, pages = {233A -- 242A}, year = {2007}, language = {en} } @article{KhareBrinkmannLawetal.2007, author = {Khare, K. and Brinkmann, M. and Law, B. M. and Gurevich, E. L. and Herminghaus, S. and Seemann, R.}, title = {Dewetting of liquid filaments in wedge-shaped grooves}, series = {Langmuir}, volume = {23}, journal = {Langmuir}, issn = {0743-7463}, doi = {10.1021/la701515u}, pages = {12138 -- 12141}, year = {2007}, abstract = {The dewetting of liquid filaments in linear grooves of a triangular cross section is studied experimentally and theoretically. Homogeneous filaments of glassy polystyrene (PS) are prepared in triangular grooves in a nonequilibrium state. At elevated temperatures, the molten PS restores its material contact angle with the substrate. Liquid filaments with a convex liquid-vapor interface decay into isolated droplets with a characteristic spacing depending on the wedge geometry, wettability, and filament width. This instability is driven by the interplay of local filament width and Laplace pressure and constitutes a wide class of ID instabilities that also include the Rayleigh -Plateau instability as a special case. Our results show an accurately exponential buildup of the instability, suggesting that fluctuations have a minor influence in our system.}, language = {en} } @article{GurevichRaizerPurwins2006, author = {Gurevich, E. L. and Raizer, Y. P. and Purwins, H.-G.}, title = {Self-sustained oscillations in a low-current discharge with a semiconductor serving as a cathode and ballast resistor: I. Experiment}, series = {Tech. Phys.}, volume = {51}, journal = {Tech. Phys.}, issn = {1063-7842}, doi = {10.1134/S106378420602006X}, pages = {180 -- 184}, year = {2006}, abstract = {Self-sustained current oscillations in a Townsend discharge that is excited in a short plane discharge gap and is uniform along the electrode surface are investigated experimentally. A thin semiconductor plane serves as a discharge cathode, a ballast resistor, and an additional capacitor in the dc power supply circuit. The domain of existence and the frequency and waveform, of oscillations are determined over a wide pressure range.}, language = {en} } @article{RaizerGurevichMokrov2006, author = {Raizer, Y. P. and Gurevich, E. L. and Mokrov, M. S.}, title = {Self-sustained oscillations in a low-current discharge with a semiconductor serving as a cathode and ballast resistor: II. Theory}, series = {Tech. Phys.}, volume = {51}, journal = {Tech. Phys.}, issn = {1063-7842}, doi = {10.1134/S1063784206020071}, pages = {185 -- 197}, year = {2006}, abstract = {Current self-sustained oscillations in a Townsend discharge are studied analytically. The proposed method for solving simple equations is applicable even when the Townsend coefficient of electron reproduction g (the main factor governing the oscillations) cannot be determined theoretically. The coefficient g is related to the discharge current-voltage characteristic, which can be obtained experimentally or from numerical simulations. Self-oscillating solutions (limit cycles) are found under various conditions. The mechanisms governing the excitation and stabilization of the solutions obtained are interpreted. It is shown that the waveform of the undamped oscillations may change significantly (the current peaks are smoothed, and the oscillation period decreases) when a weak constant cathode current, which is presumably related to the emission caused by slowly diffusing metastable molecules, is included in the equations.}, language = {en} } @article{GurevichAmiranashviliPurwins2005, author = {Gurevich, E. L. and Amiranashvili, S. and Purwins, H.-G.}, title = {Current spots in an obstructed planar glow discharge}, series = {J. Phys. D: Appl. Phys.}, volume = {38}, journal = {J. Phys. D: Appl. Phys.}, issn = {0022-3727}, pages = {1029 -- 1033}, year = {2005}, language = {en} } @article{GurevichAstrovPurwins2005, author = {Gurevich, E. L. and Astrov, Y. A. and Purwins, H.-G.}, title = {Pattern formation in planar dc-driven semiconductor-gas discharge devices: two mechanisms}, series = {J. Phys. D: Appl. Phys.}, volume = {38}, journal = {J. Phys. D: Appl. Phys.}, issn = {0022-3727}, pages = {468 -- 476}, year = {2005}, language = {en} } @article{GurevichLiehrAmiranashvilietal.2004, author = {Gurevich, E. L. and Liehr, A. W. and Amiranashvili, S. and Purwins, H.-G.}, title = {Role of surface charges in dc gas-discharge systems with high-ohmic electrodes}, series = {Phys. Rev. E}, volume = {69}, journal = {Phys. Rev. E}, issn = {1063-651X}, pages = {036211}, year = {2004}, language = {en} } @article{ZaninGurevichMoskalenkoetal.2004, author = {Zanin, A. L. and Gurevich, E. L. and Moskalenko, A. S. and Bodeker, H. U. and Purwins, H.-G.}, title = {Rotating hexagonal pattern in a dielectric barrier discharge system}, series = {Phys. Rev. E}, volume = {70}, journal = {Phys. Rev. E}, issn = {1063-651X}, doi = {10.1103/PhysRevE.70.036202}, pages = {036202}, year = {2004}, language = {en} } @article{GurevichMoskalenkoZaninetal.2003, author = {Gurevich, E. L. and Moskalenko, A. S. and Zanin, A. L. and Astrov, Yu. A. and Purwins, H.-G.}, title = {Rotating waves in a planar dc-driven gas-discharge system with semi-insulating GaAs cathode}, series = {Phys. Lett. A}, volume = {307}, journal = {Phys. Lett. A}, pages = {299 -- 303}, year = {2003}, language = {en} } @article{ZybinKuritsynGurevichetal.2010, author = {Zybin, A. and Kuritsyn, Yu. A. and Gurevich, E. L. and Temchura, V. V. and {\"U}eberla, K. and Niemax, K.}, title = {Real-time Detection of Single Immobilized Nanoparticles by Surface Plasmon Resonance Imaging}, series = {Plasmonics}, volume = {5}, journal = {Plasmonics}, issn = {1557-1955}, doi = {10.1007/s11468-009-9111-5}, pages = {31 -- 35}, year = {2010}, abstract = {In this manuscript, a new approach in surface plasmon resonance microscopy is presented. The method provides optical real-time detection of single nanoparticles on surfaces. The potential of the method is demonstrated recording spherical dielectric particles as small as 40 nm in diameter and single HIV virus-like particles having diameters of similar to 100 nm both immobilized on functionalized surfaces. The surface plasmon resonance signal in the binding spots was found to be almost linearly proportional to the size of the particles and, therefore, surpasses the intensity of Mie scattering on spherical particle (dependence similar to r(-6)) by orders of magnitude for small objects. The physical reason leading to this strong effect is discussed.}, language = {en} } @article{ChakifPrymakSlotaetal.2014, author = {Chakif, M. and Prymak, O. and Slota, M. and Heintze, E. and Gurevich, E. L. and Esen, C. and Bogani, L. and Epple, M. and Ostendorf, A.}, title = {Impact of solvent mixture on iron nanoparticles gene­rated by laser ablation}, volume = {8955}, doi = {10.1117/12.2037682}, year = {2014}, language = {en} } @article{KoehlerGhadiriKsourietal.2014, author = {K{\"o}hler, J. and Ghadiri, R. and Ksouri, S. and Guo, Q. and Gurevich, E. L. and Ostendorf, A.}, title = {Gene­ration of microfluidic flow using an optically assembled and magnetically driven microrotor}, series = {J. Phys. D: Appl. Phys.}, volume = {47}, journal = {J. Phys. D: Appl. Phys.}, issn = {0022-3727}, pages = {505501}, year = {2014}, language = {en} } @article{GurevichKittelHergenroeder2012, author = {Gurevich, E. L. and Kittel, S. and Hergenr{\"o}der, R.}, title = {Experimental and numerical study of surface alloying by femtosecond laser radiation}, series = {Appl. Surf. Sci.}, volume = {258}, journal = {Appl. Surf. Sci.}, issn = {0169-4332}, pages = {2576 -- 2579}, year = {2012}, language = {en} } @article{XiaoGurevichOstendorf2012, author = {Xiao, S. and Gurevich, E. L. and Ostendorf, A.}, title = {Incubation effect and its influence on laser patterning of ITO thin film}, series = {Appl. Phys. A}, volume = {107}, journal = {Appl. Phys. A}, pages = {333 -- 338}, year = {2012}, language = {en} } @article{GurevichTemchuraUeberlaetal.2011, author = {Gurevich, E. L. and Temchura, V. V. and Ueberla, K. and Zybin, A.}, title = {Analytical features of particle counting sensor based on plasmon assisted microscopy of nano objects}, series = {Sens. Act. B-Chem.}, volume = {160}, journal = {Sens. Act. B-Chem.}, issn = {0925-4005}, doi = {10.1016/j.snb.2011.09.050}, pages = {1210 -- 1215}, year = {2011}, language = {en} } @article{Gurevich2011, author = {Gurevich, E. L.}, title = {Self-organized nanopatterns in thin layers of superheated liquid metals}, series = {Phys. Rev. E}, volume = {83}, journal = {Phys. Rev. E}, issn = {1063-651X}, pages = {031604}, year = {2011}, language = {en} } @article{MeyerHemingGurevichetal.2011, author = {Meyer, C. and Heming, R. and Gurevich, E. L. and Marggraf, U. and Okruss, M. and Florek, S. and Franzke, J.}, title = {Radiofrequency driven and low cost fabricated microhollow cathode discharge for gaseous atomic emission spectrometry}, series = {J. An. At. Spectr.}, volume = {26}, journal = {J. An. At. Spectr.}, issn = {0267-9477}, pages = {505 -- 510}, year = {2011}, language = {en} } @article{MeyerMuellerGurevichetal.2011, author = {Meyer, C. and M{\"u}ller, S. and Gurevich, E. L. and Franzke, J.}, title = {Dielectric barrier discharges in analytical chemistry}, series = {Analyst}, volume = {136}, journal = {Analyst}, pages = {2427 -- 2440}, year = {2011}, language = {en} } @article{GurevichKittelHergenroederetal.2010, author = {Gurevich, E. L. and Kittel, S. and Hergenr{\"o}der, R. and Astrov, Yu A. and Portsel, L. M. and Lodygin, A. N. and Tolmachev, V. A. and Ankudinov, A. V.}, title = {Modification of GaAs surface by low-current Townsend discharge}, series = {J. Phys. D: Appl. Phys.}, volume = {43}, journal = {J. Phys. D: Appl. Phys.}, issn = {0022-3727}, doi = {10.1088/0022-3727/43/27/275302}, pages = {275302}, year = {2010}, abstract = {The influence of stationary spatially homogeneous Townsend discharge on the (1 0 0) surface of semi-insulating GaAs samples is studied. Samples exposed to both electrons and ions in a nitrogen discharge}, language = {en} } @article{WeichertGasparTimmetal.2010, author = {Weichert, F. and Gaspar, M. and Timm, C. and Zybin, A. and Gurevich, E. L. and Engel, M. and Mueller, H. and Marwedel, P.}, title = {Signal Analysis and Classification for Surface Plasmon Assisted Microscopy of Nanoobjects}, series = {Sens. Act. B-Chem.}, volume = {151}, journal = {Sens. Act. B-Chem.}, issn = {0925-4005}, doi = {10.1016/j.snb.2010.08.005}, pages = {281 -- 290}, year = {2010}, abstract = {The need for portable and on site screening methods for viruses is evident in face of virus infections that can spread lastly in a heavily connected world. A robust and efficient method for detecting viruses is a novel technique called Plasmon Assisted Microscopy of Nanoobjects. It is based on the acquisition of images from a sensor surface exploiting the behavior of surface plasmons in the presence of nanoobjects. In this paper an efficient image analysis approach with respect to the requirements of the sensor is presented and an embedded image processing system for this purpose is introduced. The processing pipeline comprises three steps and starts with restorating the images by removing the background and filtering artifacts. The acquired image series is analyzed pixel by pixel in a second pipeline step in order to detect pixels containing nanoobjects. In a last step pixels are aggregated to nanoobject structures. The paper introduces in the context of this virus detection method a configurable embedded system that was used for rapid prototyping of the image analysis algorithms in a flexible way. (C) 2010 Elsevier B.V. All rights reserved.}, language = {en} } @article{KanitzHoppiusFiebrandtetal.2017, author = {Kanitz, A. and Hoppius, J. S. and Fiebrandt, M. and Awakowicz, P. and Esen, C. and Ostendorf, A. and Gurevich, E. L.}, title = {Impact of liquid environment on femtosecond laser ablation}, series = {Appl. Phys. A}, volume = {123}, journal = {Appl. Phys. A}, pages = {674}, year = {2017}, language = {en} } @article{GurevichGurevich2014, author = {Gurevich, E. L. and Gurevich, S. V.}, title = {Laser Induced Periodic Surface Structures induced by surface plasmons coupled via roughness}, series = {Appl. Surf. Sci.}, volume = {302}, journal = {Appl. Surf. Sci.}, issn = {0169-4332}, pages = {118 -- 123}, year = {2014}, language = {en} } @article{KanitzKalusGurevichetal.2019, author = {Kanitz, A and Kalus, M-R and Gurevich, E L and Ostendorf, A and Barcikowski, S and Amans, D}, title = {Review on experimental and theoretical investigations of the early stage, femtoseconds to microseconds processes during laser ablation in liquid-phase for the synthesis of colloidal nanoparticles}, series = {Plasma Sources Sci. Technol.}, volume = {28}, journal = {Plasma Sources Sci. Technol.}, pages = {103001 -- 103001}, year = {2019}, language = {en} } @article{Gurevich2013, author = {Gurevich, E. L.}, title = {On the influence of surface plasmon-polariton waves on pattern formation upon laser ablation}, series = {Appl. Surf. Sci.}, volume = {278}, journal = {Appl. Surf. Sci.}, issn = {0169-4332}, pages = {52 -- 56}, year = {2013}, language = {en} } @article{MeyerFranzkeGurevich2012, author = {Meyer, C. and Franzke, J. and Gurevich, E. L.}, title = {Experimental estimation of the surface charge density in micro dielectric barrier discharges}, series = {J. Phys. D: Appl. Phys.}, volume = {45}, journal = {J. Phys. D: Appl. Phys.}, issn = {0022-3727}, doi = {10.1088/0022-3727/45/35/355205}, pages = {355205}, year = {2012}, language = {en} } @article{GurevichZaninMoskalenkoetal.2003, author = {Gurevich, E. L. and Zanin, A. L. and Moskalenko, A. S. and Purwins, H.-G.}, title = {Concentric-ring patterns in a dielectric barrier discharge system}, series = {Phys. Rev. Lett.}, volume = {91}, journal = {Phys. Rev. Lett.}, issn = {0031-9007}, pages = {154501}, year = {2003}, language = {en} } @article{KanitzHoppiusGurevichetal.2016, author = {Kanitz, A. and Hoppius, J.S. and Gurevich, E.L. and Ostendorf, A.}, title = {Influence of the Liquid on Femtosecond Laser Ablation of Iron}, series = {Physics Procedia}, volume = {83}, journal = {Physics Procedia}, pages = {114 -- 122}, year = {2016}, language = {en} } @article{KoehlerFriedrichOstendorfetal.2016, author = {K{\"o}hler, J. and Friedrich, J. and Ostendorf, A. and Gurevich, E. L.}, title = {Characterization of azimuthal and radial velocity fields induced by rotors in flows with a low Reynolds number}, series = {Phys. Rev. E.}, volume = {93}, journal = {Phys. Rev. E.}, pages = {023108}, year = {2016}, language = {en} } @article{MarkovskiiKozlovskiiFedichkinetal.2000, author = {Markovskii, S. I. and Kozlovskii, A. V. and Fedichkin, I. L. and Gurevich, E. L. and Begak, O. Y. and Borodin, A. V.}, title = {Process control in metallurgy using an EMG-20 mass-spectrometric gas analyzer}, series = {Ind. Lab.}, volume = {66}, journal = {Ind. Lab.}, issn = {0019-8447}, pages = {354 -- 359}, year = {2000}, abstract = {The potential use of an EMG-20 mass-spectrometric gas analyzer for process control and safe operation and environmental monitoring in metallurgy (oxygen converter process) is considered. The EMG-20 parameters are adequate for rapid, automatic on-line analysis of metallurgical waste gases. A multichannel system of sampling. sample preparation, and transportation of sampled gases for analysis is proposed.}, language = {en} } @inproceedings{KielBulgakovaOstendorfetal.2019, author = {Kiel, F. and Bulgakova, N. M. and Ostendorf, A. and Gurevich, E.L.}, title = {Selective Delamination of Thin Films from Ceramic Surfaces upon Femtosecond Laser Ablation}, series = {Conference on Lasers and Electro-Optics}, booktitle = {Conference on Lasers and Electro-Optics}, publisher = {Optical Society of America}, isbn = {978-1-943580-57-6}, doi = {10.1364/CLEO_AT.2019.JTu2A.47}, pages = {JTu2A.47 -- JTu2A.47}, year = {2019}, abstract = {Experimental observation of selective delamination of YSZ ceramics upon femtosecond laser processing of its surface is reported. The delamination mechanism is identified as an interplay between beam defocusing by laser-generated free-electron plasma and Kerr nonlinearity.}, language = {en} } @article{SyubaevMitsaiPorfirevetal.2020, author = {Syubaev, S. and Mitsai, E. and Porfirev, A. and Khonina, S. and Kudryashov, S. and Katkus, T. and Juodkazis, S. and Gurevich, E. L. and Kuchmizhak, A.}, title = {Silicon microprotrusions with tailored chirality enabled by direct femtosecond laser ablation}, series = {Optics Letters}, volume = {45}, journal = {Optics Letters}, number = {11}, doi = {10.1364/OL.393979}, pages = {3050 -- 3053}, year = {2020}, abstract = {Here, we report on formation of nanoprotrusions on the surface of a bulk crystalline silicon wafer under femtosecond-laser ablation with a donut-shaped laser beam. By breaking circular symmetry of the irradiating donut-shaped fs-pulse beam, a switch in geometry of the formed surface nanoprotrusions from regular to chiral was demonstrated. The chirality of the obtained Si nanostructures was promoted with an asymmetry degree of the laser beam. An uneven helical flow of laser-melted Si caused by asymmetry of the initial intensity and temperature pattern on the laser-irradiated Si surface explains this phenomenon. Chirality of the formed protrusions was confirmed by visualizing cross-sectional cuts produced by focused ion beam milling as well as Raman activity of these structures probed by circularly polarized light with opposite handedness. Our results open a pathway towards easy-to-implement inexpensive …}, language = {en} }