14.11.2017 in the RC OLMIV a seminar and Lab tour on the topic: "Optical and laser materials research in heritage science" was held

The seminar was conducted in the framework of  the International Scientific and Practical Conference "Heritage, Science and Technology"

Dr. Pascal Lievaux, France. Head of the Research and Scientific Policy Pilot department at the General Direction for Heritage, French Ministry of Culture.

Michel Menu, Head of the department of Research, Centre de recherche et de restauration des musées de France (C2RMF), Paris, France.

Tatiana  Laska,  Senior lecturer of the Faculty of Arts SPbSU

Nicolai Kurganov, Senior lecturer of the Faculty of Arts  SPbSU

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27.10.2017 in the RC OLMIV a seminar on the topic: "Spectral-kinetic studies of photophysical processes involving molecules of dyes and biomolecules in the presence of noble metal nanoparticles" was held

"Spectral-kinetic studies of photophysical processes involving dye molecules and biomolecules in the presence of noble metal nanoparticles"

Author - Andrei Yuryevich Zyubin, Immanuel Kant Baltic Federal University.

The seminar was attended by specialists of the resource center, scientific and pedagogical workers of the Institute of Chemistry and Medical Faculty of St. Petersburg State University.

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01.09.2017 Acknowledging publications

Optics and Lasers in Engineering 96 (2017) 63–67

Vadim Veiko, Yulia Karlagina, Mikhail Moskvin, Vladimir Mikhailovskii, Galina Odintsova, Pavel Olshin, Dmitry Pankin, Valery Romanov, Roman Yatsuk

«Metal surface coloration by oxide periodic structures formed with nanosecond laser pulses»

Optics and Lasers in Engineering 96 (2017) 63–67

DOI: 10.1016/j.optlaseng.2017.04.014

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In this work, we studied a method of laser-induced coloration of metals, where small-scale spatially periodic structures play a key role in the process of color formation. The formation of such structures on a surface of AISI 304 stainless steel was demonstrated for the 1.06 µm fiber laser with nanosecond duration of pulses and random (elliptical) polarization. The color of the surface depends on the period, height and orientation of periodic surface structures. Adjustment of the polarization of the laser radiation or change of laser incidence angle can be used to control the orientation of the structures. The formation of markings that change their color under the different viewing angles becomes possible. The potential application of the method is metal product protection against falsification.

 

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12.06.2017 Acknowledging publications

Journal of Luminescence 192 (2017) 40–46

I.E. Kolesnikov, A.A. Kalinichev, M.A. Kurochkin, D.V. Mamonova, E.Yu. Kolesnikov, A.V. Kurochkin, E. Lähderanta, M.D. Mikhailov

«New strategy for thermal sensitivity enhancement of Nd3+-based ratiometric luminescence thermometers»

Journal of Luminescence 192 (2017) 40–46

DOI: 10.1016/j.jlumin.2017.06.024

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Accurate luminescence thermal sensing using nanophosphors that operate within biological windows is of great interest in bio- and nanomedicine. Here, we show that Nd3+-doped YVO4 NPs can act as nanothermometers in the second biological window upon 808 nm excitation. Significant enhancement of thermal sensitivity and temperature resolution was achieved by optimal choice of wavelengths for ratiometric thermal calibration. It was concluded that thermal calibration should be calculated using integral intensities. The obtained temperature uncertainty together with the emission and excitation lying in the biological windows open the venue to the possible application of Nd3+-doped YVO4 NPs for real time sub-tissue luminescence thermal sensing with a subdegree resolution.

 

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