scholarly journals Optical Properties of Porous Silicon p-Si (100)

2019 ◽  
Vol 20 (3) ◽  
pp. 264-268
Author(s):  
P.O. Gentsar ◽  
M.V. Vuichyk ◽  
M.V. Isaev ◽  
P.O. Lischuk
Keyword(s):  
Optical Properties ◽  
Porous Silicon ◽  
Single Crystal ◽  
Pore Size ◽  
Band Gap ◽  
Spectral Range ◽  
Reflectance Spectra ◽  
Transmission Spectra

In this paper the reflectance spectra and transmission spectra of p-Si (100) porous silicon (PS) and silicon wires in the spectral range of 200 ÷ 1800 nm were investigated. Pore size of PS was 5 μm (lpor Si layer) and 50 μm (lpor Si layer) with porosity of 45 %, 55 % and 65 %. The length of silicon wires varies from 5.5 μm, to 50 μm with a porosity of 60 %. The decrease in the band gap of p-Si (100) porous silicon and silicon wires which grown on both sides of p-Si (100) as compared to the single crystal p-Si (100) is explained by the quantum-sized effect that occurs in the investigated objects.

scholarly journals Измерение оптических свойств десны и дентина человека в спектральном диапазоне 350–800 нм

2020 ◽  
Vol 20 (4) ◽  
pp. 258-267
Author(s):  
Alexey Andreevich Selifonov ◽  
◽  
Olga Anatolyevna Zyuryukina ◽  
Ekaterina Nikolaevna Lazareva ◽  
Julia Sergeevna Skibina ◽  
...  
Keyword(s):  
Optical Properties ◽  
Spectral Range ◽  
Photothermal Therapy ◽  
Diffuse Reflection ◽  
Biological Tissues ◽  
Transmission Spectra ◽  
Tissue Samples ◽  
Scattering Coefficients ◽  
Total Transmission

Knowledge of the optical properties of biological tissues is important for the development of optical diagnostics, photodynamic and photothermal therapy of various diseases. However, despite the significant number of works devoted to the determination of the optical properties of tissues, the optical properties of human gums and dentin remain currently poorly understood. In this work, we experimentally studied the optical properties of human gums and dentin in the spectral range from 350 nm to 800 nm. Basing on measured diffuse reflection and total transmission spectra and using the Inverse Adding Doubling (IAD) method, the spectral dependences of absorption and scattering coefficients of the studied tissue samples were calculated.

scholarly journals Оптические свойства пленок ниобата бария стронция SBN61

2018 ◽  
Vol 60 (5) ◽  
pp. 993
Author(s):  
В.Б. Широков ◽  
А.В. Павленко ◽  
Д.В. Стрюков ◽  
Ю.В. Ревинский
Keyword(s):  
Refractive Index ◽  
Single Crystal ◽  
Band Gap ◽  
Optical Transmission ◽  
Visible Range ◽  
Transmission Spectra ◽  
X Ray Diffraction ◽  
Dispersion Parameters ◽  
X Ray ◽  
Optical Transmission Spectra

AbstractHeteroepitaxial Sr_0.61Ba_0.39Nb_2O_6 films have been formed on MgO(001) substrates by RF deposition in an oxygen atmosphere. The film orientation with respect to the substrate is investigated using X-ray diffraction. The permittivity dispersion parameters in the visible range are determined by measuring optical transmission spectra. The films are found to have a wider band gap and a smaller refractive index as compared with the single-crystal material.

scholarly journals Optical Properties and Band Gap of Ternary PSN-PMN-PT Single Crystals

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 955
Author(s):  
Wei Long ◽  
Xing Fan ◽  
Pinyang Fang ◽  
Xiaojuan Li ◽  
Zengzhe Xi
Keyword(s):  
Optical Properties ◽  
Single Crystal ◽  
Band Gap ◽  
Structural Changes ◽  
Interband Transition ◽  
Frequency Dispersion ◽  
Domain Size ◽  
Large Lattice ◽  
Application Potential ◽  
Ferroelectric Single Crystal

This study investigated the optical properties and the interband transition of a ternary [100]-oriented 6PSN-61PMN-33PT relaxor ferroelectric single crystal. Compared with the binary [100]-oriented PMN-32PT crystal, the [100]-oriented 6PSN-61PMN-33PT crystal exhibited excellent optical properties, including high transmittance, low refractive index, weak frequency dispersion, and low reflection and absorption coefficients. All these differences can be attributed to the structural changes of the 6PSN-61PMN-33PT crystal, such as its large lattice size and increased band gap. The crystal’s transmittance was significantly improved after alternating current electric field poling due to the increased domain size and the order domain structure. The largest transmittance for the 6PSN-61PMN-33PT crystal was up to 66%. Our experimental results indicate that the ternary 6PSN-61PMN-33PT ferroelectric single crystal has great application potential in the optical field.

scholarly journals Absorption spectra of single-crystal and optical ceramics of fluorite in terahertz and infrared ranges

2019 ◽  
Vol 487 (1) ◽  
pp. 20-23
Author(s):  
G. A. Komandin ◽  
V. S. Nozdrin ◽  
P. P. Fedorov ◽  
V. V. Osiko
Keyword(s):  
Single Crystal ◽  
Absorption Spectra ◽  
Room Temperature ◽  
Reflectance Spectra ◽  
Optical Characteristics ◽  
Transmission Spectra ◽  
Optical Ceramics ◽  
High Absorption

The transmission spectra of a single crystal, artificial and natural fluorite ceramics were recorded in the areas of material transparency in THz and the average IR range at room temperature. In the region of high absorption, the reflectance spectra were measured. Differences in the optical characteristics of a single crystal and optical ceramics are insignificant.

Modeling of the optical properties of porous silicon photonic crystals in the visible spectral range

2017 ◽  
Vol 122 (1) ◽  
pp. 79-82 ◽  
Author(s):  
D. S. Dovzhenko ◽  
I. L. Martynov ◽  
I. S. Kryukova ◽  
A. A. Chistyakov ◽  
I. R. Nabiev
Keyword(s):  
Optical Properties ◽  
Porous Silicon ◽  
Photonic Crystals ◽  
Spectral Range ◽  
Visible Spectral Range ◽  
Silicon Photonic

STRUCTURAL AND OPTICAL PROPERTIES OF n-TYPE POROUS SILICON — EFFECT OF HF CONCENTRATION

2007 ◽  
Vol 14 (02) ◽  
pp. 293-300 ◽  
Author(s):  
N. JEYAKUMARAN ◽  
B. NATARAJAN ◽  
S. RAMAMURTHY ◽  
V. VASU
Keyword(s):  
Optical Properties ◽  
Porous Silicon ◽  
Pore Size ◽  
Concentration Ratio ◽  
Silicon Wafers ◽  
Structural And Optical Properties ◽  
Type Silicon

Porous silicon layers have been prepared from n-type silicon wafers of (100) orientation. SEM, XRD, FTIR, and PL have been used to characterize the morphological and optical properties of porous silicon. The influence of varying HF concentration in the anodizing solution, on structural and optical properties of porous silicon has been investigated. It is observed that pore size increases with HF:ethanol concentration ratio and attain maximum for 1:2 ratio and then decreases.

STRUCTURAL AND OPTICAL PROPERTIES OF n-TYPE POROUS SILICON: EFFECT OF LIGHT ILLUMINATION

2008 ◽  
Vol 15 (06) ◽  
pp. 897-901 ◽  
Author(s):  
N. JEYAKUMARAN ◽  
B. NATARAJAN ◽  
N. PRITHIVIKUMARAN ◽  
S. RAMAMURTHY ◽  
V. VASU
Keyword(s):  
Optical Properties ◽  
Porous Silicon ◽  
Pore Size ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Chemical Species ◽  
Illumination Level ◽  
Light Illumination ◽  
Structural And Optical Properties ◽  
Effect Of Light

Porous silicon (PS) layers have been prepared from n-type silicon wafers of (100) orientation. SEM, FTIR, and PL have been used to characterize the morphological and optical properties of PS. The influence of varying light illumination in the anodizing solution, on structural and optical properties of PS, has been investigated. It is observed that pore size increases with light illumination level, attains maximum for 17.5 mW/m2 and then decreases. The PL spectrum peak shifts toward the higher energy side, which supports the quantum confinement effect in PS. The FTIR shows that the Si – H n peaks are observed at the surface of the PS layer and these chemical species also give raise the PL in PS.

Applying Band Gap Engineering to Tune Linear Optical and Nonlinear Optical Properties of Noncentrosymmetric Chalcogenides La4Ge3SexS12-x (x = 0, 2, 4, 6, 8, 10)

2021 ◽  
Author(s):  
Gary Cicirello ◽  
Kui Wu ◽  
Bingbing Zhang ◽  
Jian Wang
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Single Crystal ◽  
Band Gap ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Band Gap Engineering ◽  
Linear Optical

La4Ge3S12 was structurally characterized in 1974 without any optical or nonlinear optical properties reported. Herein we report that the The acentric crystal structure of La4Ge3S12 has been confirmed by single-crystal...

Growing of bulk β-(Al x Ga1-x )2O3 crystals from the melt by Czochralski method and investigation of their structural and optical properties

2021 ◽  
Author(s):  
Dmitrii A. Zakgeim ◽  
Dmitrii Bauman ◽  
Dmitrii Yi. Panov ◽  
Vladislav A. Spiridonov ◽  
Arina Kremleva ◽  
...  
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Optical Transmission ◽  
Czochralski Method ◽  
Transmission Spectra ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Al Content ◽  
Optical Transmission Spectra

Abstract Bulk (Al x Ga1-x )2O3 crystals with an Al fraction x in the range from 0.0 to 0.23 were successfully grown by the Czochralski method. An increase in the band gap from 4.7 eV to 5.1 eV with the rise of the Al content was demonstrated by analyzing optical transmission spectra. The crystal quality of the obtained samples was controlled by X-ray diffractometry. The appearance of crystal`s mosaic blockness was found for the Al fraction x above 0.05.

Sign in / Sign up

Export Citation Format

Share Document