Light scattering by nanosized systems with different spatial organizations

The integrodifferential equation method is used to study the spectrum of a nanoparticle colloid for the example of interaction of three arbitrarily arranged dielectric particles made up of nonresonant atoms (the eigenfrequency of the transition is far from the emission frequency) with incorporated barium atoms in an external optical radiation field. The effect on the light-scattering properties of a nanosphere in the ensemble of its distant “neighbors” is studied; an additional peak associated with them is observed as a frequency close to the resonance for an isolated nanosphere, which under certain conditions has higher intensity than the main peak corresponding to optical near-field resonance in a two-particle system. The dependence of the spectrum of the nanosized system on the geometric structure is studied, and it is shown that very precise tuning of the resonance frequency is possible by varying the angular distribution of the particles. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 5, pp. 641–646, September–October, 2006.     

Taking into account scattering of polarized laser radiation by cuvet walls when probing blood

We have studied the ratio of the intensities of radiation scattered by a layer of blood in a cuvet and by the cuvet walls for normal incidence or incidence at the Brewster angle for probing radiation from a He-Ne laser, linearly polarized in the plane of incidence (plane of observation) or orthogonal to that plane. We have compared it with the intensity of the radiation reflected by the surface of the cuvet wall, as estimated based on the geometric approximation. We have found the optimal conditions for probing and observing scattering for the layer in a cuvet, where such conditions are characterized by a minimal effect from the cuvet walls and the maximum ratio of useful signal to background. Report given at the Fifth International Scientific and Technical Conference on Quantum Electronics, 22–25 November 2004, Minsk, Belarus. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 2, pp. 270–272, March–April, 2006.     

蒽酮高分子复合物发光体的光老化研究

通过５５５ｎｍ单色光照射下的２小时人工老化和露天中２６个月自然老化。研究了蒽酮高分子复合物发光体的光老化性质，经过２６个月的自然老化发光峰值强度下降了４８％，树脂的光透过度下降了４０％，表明光老化的原因主要是树脂老化引起的。     

Study on mode-filtered light sensor for methane detection

A novel mode-filtered light gas sensor has been reported.It was constructed by inserting an optical fiber deposited by a thin silicone cladding of cryptophane A into a fused-silica capillary.When different concentration of methane gas was introduced to the sensor,the phenomenon that mode-filtered light intensity decreased with the increasing concentration of methane was observed. And a linear relationship was obtained within the methane concentration range of 0.0-16.0%(v/v).The detection limit was 0.06% ...     

Absorption spectroscopy using a coherent transition radiation millimeter wave light source

The characteristics and applicability of the absorption spectroscopy system using the coherent transition radiation light source have been investigated. The configurations of the system are relatively simple. The operational conditions of an electron linear accelerator have been evaluated. The stability of the light intensity has been within ±2–3% in a wavenumber range of 4–13 cm⁻¹. The light intensity has been found to be more than six orders of magnitude higher than that for the lowest limit for detection.     

New Receiving Mode of Extinction for Determining Particle Size and Density without Convex Lens

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｉｆａｌｉｇｈｔｂｅａｍ ｐａｓｓｅｓｔｈｒｏｕｇｈｔｈｅｐａｒｔｉｃｕｌａｔｅｔｒａｎｓｐａｒｅｎｔｍｅｄｉｕｍ ,ｉｔｓｉｎｔｅｎｓｉｔｙｗｉｌｌｂｅｗｅａｋｅｎｅｄｂｅｃａｕｓｅｏｆｔｈｅｅｘｔｉｎｃｔｉｏｎｏｆｐａｒｔｉｃｌｅｓ[1] .Ｔｈｉｓｐｈｅｎｏｍｅｎｏｎｉｓｃａｕｓｅｄｂｙｔｈｅｓｃａｔｔｅｒｉｎｇａｎｄａｂｓｏｒｐｔｉｏｎｏｆ ｐａｒｔｉｃｌｅｓ.Ｔｈｅｓｃａｔｔｅｒｉｎｇｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｗａｖｅｓａｒｅｄｉｆｆｕｓｅｄｉｎｓｐａｃｅａｌ…     

长焦距光学系统杂光系数测试仪

报告了一种新的长焦距光学系统杂光系数测量装置,该装置除具有避免了制作大直径积分球的优点外,还能精确测量轴外杂光系数,分析各部分杂光源对杂光系数的影响.     

同步辐射光源的尺寸、散射角和中心亮度计算

 同步辐射光源的尺寸、散角和中心亮度是装置的重要参数。着重讨论了同步光源的尺寸、散角和中心亮度的计算方法, 并给出了合肥同步辐射光源的结果。     

牛顿对光与颜色的研究

详细叙述了牛顿在１６６５－１６７５年间对光和颜色的研究过程，阐明牛顿从原来看到光谱带有五种颜色到认为光谱带有七种颜色的转变，论述了这种转变的原因     

Detector based on time-resolved ion-induced voltage in laser multiphoton ionization and laser-induced fluorescence

The time-resolved ion-induced voltages obtained from multiphoton ionization (MPI) in gases were applied, for the first time, together with time-resolved laser-induced fluorescence (TR-LIF) for fast detection of organic compounds in ambient air. The target compounds were polycyclic aromatic hydrocarbons (PAHs) and nitroaromatics. The concepts of the proposed method are presented and examined. It is shown that the MPI signals allow for estimation of the molecular weight, while the fluorescence data supply additional quantitative and qualitative information. A 3D data presentation is suggested for obtaining selectivity. The proposed dimensions are the MPI-based mass estimation, the maximum LIF wavelength and the measured fluorescence lifetime. Since all required data are acquired simultaneously and since the setup can be continuously operated, this analytical concept is suggested for on-line applications. The common air components are not ionized at the selected wavelengths and only the organic pollutants are detected under these conditions. Moreover, it is shown that the resonant MPI mode provides a certain level of selectivity. Therefore, this setup may become the basis of an air sniffer.