Visualization of Longitudinal and Transverse Components of Strongly Focused Optical Field by means of Photo-Reactive Azopolymers

Most important problems in modern photonics are fabrication, visualization and characterization of nanomaterials at optical frequencies. A number of optical techniques uses tightly focused laser beams to access longitudinal electromagnetic fields, which are directed towards the wave vector. In this Letter, the distribution of transverse and longitudinal optical fields in tightly focused laser beams, polarized in a new fashion, is investigated. Polarization dependent fingerprints of transverse and longitudinal optical fields are experimentally captured by means of photoinduced surface deformations in azobenzene polymer thin films

Visualization of Longitudinal and Transverse Components of Strongly Focused Optical Field by means of Photo-Reactive Azopolymers

Most important problems in modern photonics are fabrication, visualization and characterization of nanomaterials at optical frequencies. A number of optical techniques uses tightly focused laser beams to access longitudinal electromagnetic fields, which are directed towards the wave vector. In this Letter, the distribution of transverse and longitudinal optical fields in tightly focused laser beams, polarized in a new fashion, is investigated. Polarization dependent fingerprints of transverse and longitudinal optical fields are experimentally captured by means of photoinduced surface deformations in azobenzene polymer thin films

Visualization of Longitudinal and Transverse Components of Strongly Focused Optical Field by means of Photo-Reactive Azopolymers

Most important problems in modern photonics are fabrication, visualization and characterization of nanomaterials at optical frequencies. A number of optical techniques uses tightly focused laser beams to access longitudinal electromagnetic fields, which are directed towards the wave vector. In this Letter, the distribution of transverse and longitudinal optical fields in tightly focused laser beams, polarized in a new fashion, is investigated. Polarization dependent fingerprints of transverse and longitudinal optical fields are experimentally captured by means of photoinduced surface deformations in azobenzene polymer thin films

Enhanced wave dynamics at the surface of nonlinear Raman-active plasmonic material

© 2020 Author(s). It is commonly known that optical losses in metal emerges due to the imaginary part of a material permittivity in the visible spectrum. This causes the low quality factors for plasmonic resonators of conventional materials. Nonlinear plasmonics attracts an interest as platform for controlling of light propagation as well as for its enhancement. In this work we demonstrate that stimulated Raman scattering of pump field energetically supports the propagation of plasmons on the surface of nonlinear plasmonic material. Here we solve nonlinearly coupled wave equations for surface plasmon-polariton (SPP) modes in case of stimulated Raman scattering and demonstrate the extension of SPP propagation distance. We believe that Raman-based active plasmonics makes one step closer to the development of efficient plasmonic devices

Amplification of Stimulated Raman Scattering in Media with a Near-Zero Refractive Index

Materials with a near-zero refractive index open up new possibilities for enhancing nonlinear optical interactions. This lowers the threshold for nonlinear generation, reduces the size of existing nonlinear devices, and opens up prospects for new applications. In this work, the enhancement of stimulated Raman scattering (SRS) in materials with near-zero permittivity is studied. It is shown that the frequency shift of the Stokes wave gain is observed in these media, which leads to the shift of the SRS lines. In addition, a condition for the permittivity of the medium is obtained under which the SRS gain reaches its maximum value

Current state of methodological and decisions for radiation treatment of blood, its components and products

This article presents currently used blood transfusion media — components and blood products, therapeutic effects, reactions and complications of blood transfusion, use of radiation treatment for blood transfusion fluids. There had been discussed in detail the practice of radiation processing of blood components and for the prevention of reaction "graft versus host" and studies of plasma radiation treatment for its infectious safety. There was presented the current state of techniques and technical solutions of radiation treatment of transfusion-transmissible environments. There were also considered an alternative to radiation treatment of blood

Disordered Nonlinear Metalens for Raman Spectral Nanoimaging

© 2020 American Chemical Society. Over the past decades, considerable progress has been made toward far-field optical imaging beyond the diffraction limit. However, most working proof-of-concepts are based on either time-consuming scanning of a subdiffraction focal spot over a sample or postrecovery treatment using a priori information on a sought image. To our knowledge, none of these can be regarded as being close to a perfect far-field superlensing system capable of real-time color imaging with subwavelength resolution. In this paper, we suggest a proof-of-concept for far-field nonlinear metalens that is made of a disordered metal-dielectric nanocomposite. Postoxidation of a refractory titanium nitride (TiN) thin film, used as a nonlinear plasmonic material, results in the formation of a titanium oxynitride (TiON) film comprising a mixture of multiple phases of TiOxNy. Due to a double epsilon-near-zero behavior near the percolation threshold, the TiON favors supercoupling of the incident light to surface plasmon resonance within the visible and near-infrared range. Point spread function narrowing is achieved owing to the multiplicative nature of stimulated Raman scattering (SRS) and enhanced third-order optical nonlinearity in TiN and TiO2 particle chains through plasmon resonances and Anderson localization of light, respectively. Combined with a conventional confocal optical microscope, the multimode metalens shows subwavelength resolution of λ/6NA at different visible wavelengths (SRS overtones) using multiwalled carbon nanotubes as a test sample. We are confident that our finding will bring us one step closer to developing a robust and versatile far-field super-resolution color imaging system and, eventually, implementing "eye-on-a-chip" technology

Growing lithium tetraborate crystals in the YXl/53° and XZb/45° directions and their characteristics

Different methods of charge synthesization are discussed. Peculiarities of growing LBO crystal in the YXl/53° and XZb/45° directions by Czokhralsky method are given. Morphology of LBO crystals is described. Characteristics of LBO-resonators are given

Социально-демографическая характеристика и состояние здоровья женщин фертильного возраста московской области

. SObjective: analysis of the state of health, medical activity, social and demographic characteristics of women of child-bearing age to develop a set of medical and organizational measures aimed at reducing the loss of maternal and child health, improving the system of maternal and child health. Material and Methods. The following methods were used in the work: bibliographic, analytical, mathematical- statistical, sociological (questioning). The material of the study was 596 questionnaires of a sociological survey of women - patients of the regional perinatal center. Each questionnaire included 48 questions combined into 6 blocks (social, demographic characteristics, state of health, medical activity), which were processed using the statistical program PASW (Predictive Analytics Software) Statistics 22 Results. It was found that the majority of respondents considered themselves to be in the healthy group, every fifth considered that they had chronic diseases and 11.9% felt sick. In the structure of chronic pathology, the largest proportion was accounted for by respiratory diseases, ENT organs, circulatory system diseases, gynecological diseases. Conclusion. On the basis of the obtained data, the directions for improving the system of maternal and child health have been proposed, such as: strengthening preventive activities, improving the quality of clinical examination of the female population; improvement of continuity in the work of institutions of the maternal and child welfare system; introduction of interactive forms of education for pregnant women.Цель: обоснование комплекса мероприятий медико-организационного характера, направленных на сохранение здоровья матери и ребенка, развитие системы охраны материнства и детства, на основании анализа состояния здоровья женщин фертильного возраста, их социальных и демографических характеристик и медицинской активности. Материал и методы. В работе использовались следующие методы: библиографический, аналитический, математико- статистический, социологический (анкетирование). Материалом исследования послужили 596 анкет социологического опроса женщин - пациенток областного перинатального центра. Каждая анкета включала 48 вопросов, объединенных в 6 блоков (социальные, демографические характеристики, состояние здоровья, медицинская активность, которые были обработаны с использованием статистической программы PASW (Predictive Analytics Software) Statistics 22 Результаты. Установлено, что большинство респондентов относили себя к группе здоровых, каждая пятая считала, что страдает заболеваниями хронического характера и 11,9% чувствовали себя больными. Болезни органов дыхания, системы кровообращения, мочеполовой системы занимали ведущие места в структуре заболеваемости. Заключение. На основании полученных данных предложены направления совершенствования системы охраны материнства и детства, такие как усиление профилактической деятельности, повышение качества диспансеризации женского населения; совершенствование преемственности в работе учреждений системы охраны материнства и детства; внедрение интерактивных форм обучения беременных