scholarly journals Темплатный синтез монодисперсных сферических нанопористых частиц кремния субмикронного размера

2019 ◽  
Vol 53 (8) ◽  
pp. 1068
Author(s):  
Д.А. Курдюков ◽  
Н.А. Феоктистов ◽  
Д.А. Кириленко ◽  
А.Н. Смирнов ◽  
В.Ю. Давыдов ◽  
...  
Keyword(s):  
Silica Particles ◽  
Wet Etching ◽  
Mean Square ◽  
Nanoporous Silicon ◽  
Near Ir ◽  
Small Root ◽  
Monodisperse Silica ◽  
Infrared Spectral ◽  
Spectral Ranges ◽  
Template Material

AbstractMonodisperse spherical nanoporous silicon ( np -Si) particles of submicrometer size are fabricated with mesoporous silica particles as a template. Silicon is synthesized within the mesopores of monodisperse silica particles by the thermal decomposition of monosilane. Then, the template material ( a -SiO_2) is removed by wet etching. The particles obtained have a small root-mean-square size scatter (no more than 10%) and large specific surface area (250 m^2 g^–1) and pore volume (0.5 cm^3 g^–1). It is shown that np -Si particles exhibit photoluminescence in the visible and near-IR (infrared) spectral ranges.

Size Effect on Optical Properties of Silicon Dioxide Hollow Particles

2020 ◽  
Vol 312 ◽  
pp. 26-31
Author(s):  
Viktoriia Iurina ◽  
Vitaly V. Neshchimenko ◽  
Chun Dong Li
Keyword(s):  
Optical Properties ◽  
Silicon Dioxide ◽  
Near Infrared ◽  
Photoelectron Spectra ◽  
Hollow Particles ◽  
X Ray ◽  
Near Ir ◽  
Infrared Spectral ◽  
Uv Visible ◽  
Spectral Ranges

The optical properties of silicon dioxide hollow particles with different size were investigated in UV/visible/near-IR region, as well as X-ray photoelectron spectra were analyzed. Synthesis of SiO2 hollow particles was carried out using a template method. It was established that hollow particle reflectance lower than bulk microparticles. Absorptance in the red and near infrared spectral ranges increases with decreasing size of hollow particles, but in the UV-region conversely. This is due to different absorption centers.

scholarly journals Integrated Optical Phased Arrays for Beam Forming and Steering

2021 ◽  
Vol 11 (9) ◽  
pp. 4017
Author(s):  
Yongjun Guo ◽  
Yuhao Guo ◽  
Chunshu Li ◽  
Hao Zhang ◽  
Xiaoyan Zhou ◽  
...  
Keyword(s):  
Near Infrared ◽  
Phased Arrays ◽  
Mechanical Stability ◽  
Building Blocks ◽  
High Yield ◽  
Beam Forming ◽  
Integrated Optical ◽  
Optical Phased Arrays ◽  
Infrared Spectral ◽  
Spectral Ranges

Integrated optical phased arrays can be used for beam shaping and steering with a small footprint, lightweight, high mechanical stability, low price, and high-yield, benefiting from the mature CMOS-compatible fabrication. This paper reviews the development of integrated optical phased arrays in recent years. The principles, building blocks, and configurations of integrated optical phased arrays for beam forming and steering are presented. Various material platforms can be used to build integrated optical phased arrays, e.g., silicon photonics platforms, III/V platforms, and III–V/silicon hybrid platforms. Integrated optical phased arrays can be implemented in the visible, near-infrared, and mid-infrared spectral ranges. The main performance parameters, such as field of view, beamwidth, sidelobe suppression, modulation speed, power consumption, scalability, and so on, are discussed in detail. Some of the typical applications of integrated optical phased arrays, such as free-space communication, light detection and ranging, imaging, and biological sensing, are shown, with future perspectives provided at the end.

Application Of Systems With Total Internal Reflection At Novosibirsk Free Electron Laser For Spectroscopy In The Terahertz Range

2016 ◽  
Vol 11 (3) ◽  
pp. 72-82
Author(s):  
Vasily Gerasimov ◽  
Elvira Grigorieva ◽  
Boris Knyazev ◽  
Yuliya Choporova
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Quantum Cascade Lasers ◽  
Attenuated Total Reflection ◽  
Terahertz Range ◽  
Optical Systems ◽  
Early Diagnosis Of Cancer ◽  
Infrared Spectral ◽  
Atr Spectroscopy ◽  
Spectral Ranges

Attenuated total reflection (ATR) spectroscopy is widely used in the visible and infrared spectral ranges. Progress in the development of laboratory scale monochromatic sources of terahertz radiation, such as quantum cascade lasers, suggests that in the near future this kind of spectrometers will be widely spread in the terahertz range. For this reason, the development of ATR based methods and devices is highly relevant. In this paper, we discuss the features of the use of ATR spectroscopy in the terahertz range, and describe some of the optical systems, designed for experiments at the Novosibirsk free electron laser (NovoFEL). We show that in the terahertz range the ATR spectroscopy has a number of significant advantages over the absorption spectroscopy. As an example, we are discussing the possibility of using terahertz polarimetry to develop a method for early diagnosis of cancer via the detection of left-handed to right-handed polysaccharide enantiomers ratio. Spectra of selected polysaccharides were recorded with a standard Fourier spectrometer using developed by us an ATR unit. The possibility of studying the polarization characteristics of polysaccharides in aqueous solutions using spectrally selective polarimeter with the NovoFEL as a tunable radiation source was demonstrated.

Synthesis of highly monodisperse silica particles by addition of anionic surfactants

2010 ◽  
Vol 18 (4) ◽  
pp. 321-323 ◽  
Author(s):  
Son Tung Ha ◽  
O. Ok Park ◽  
Sang Hyuk Im
Keyword(s):  
Anionic Surfactants ◽  
Silica Particles ◽  
Monodisperse Silica

scholarly journals Spectrally resolved confocal microscopy using lanthanide centred near-IR emission

2015 ◽  
Vol 51 (12) ◽  
pp. 2372-2375 ◽  
Author(s):  
Zhiyu Liao ◽  
Manuel Tropiano ◽  
Konstantins Mantulnikovs ◽  
Stephen Faulkner ◽  
Tom Vosch ◽  
...  
Keyword(s):  
Confocal Microscopy ◽  
Silica Particles ◽  
Near Ir ◽  
Nir Imaging ◽  
Spectrally Resolved ◽  
Ir Emission

NIR imaging of lanthanide-coated silica particles where the photons used to generate the image unambiguously can be assigned to arise from lanthanide centred emission.

Ellipsometric Study of Monodisperse Silica Particles at an Oil−Water Interface

Langmuir ◽  
2003 ◽  
Vol 19 (21) ◽  
pp. 8888-8893 ◽  
Author(s):  
Bernard P. Binks ◽  
John H. Clint ◽  
Amro K. F. Dyab ◽  
Paul D. I. Fletcher ◽  
Mark Kirkland ◽  
...  
Keyword(s):  
Silica Particles ◽  
Water Interface ◽  
Monodisperse Silica ◽  
Ellipsometric Study ◽  
Oil Water

Optical Constants of Zinc Selenide in Visible and Infrared Spectral Ranges

2017 ◽  
Vol 84 (4) ◽  
pp. 679-682 ◽  
Author(s):  
H. Qi ◽  
X. Zhang ◽  
M. Jiang ◽  
Q. Wang ◽  
D. Li
Keyword(s):  
Zinc Selenide ◽  
Optical Constants ◽  
Infrared Spectral ◽  
Spectral Ranges
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