New Stripe Geometry Laser with High Quality Lasing Characteristics by Horizontal Transverse Mode Stabilization –A Refractive Index Guiding with Zn Doping

1977 ◽  
Vol 16 (1) ◽  
pp. 209-210 ◽  
Author(s):  
Hiroo Yonezu ◽  
Yoshishige Matsumoto ◽  
Tsuneo Shinohara ◽  
Isamu Sakuma ◽  
Tohru Suzuki ◽  
...  
Keyword(s):  
Refractive Index ◽  
Transverse Mode ◽  
High Quality ◽  
Zn Doping ◽  
Horizontal Transverse Mode ◽  
Mode Stabilization

Lead-Free High Refractive Index Glasses Produced from Local Raw Materials

2008 ◽  
Vol 39-40 ◽  
pp. 257-260 ◽  
Author(s):  
Pisutti Dararutana ◽  
Prukswan Chetanachan ◽  
J. Dutchaneephet ◽  
Narin Sirikulrat
Keyword(s):  
Refractive Index ◽  
Chemical Elements ◽  
Raw Materials ◽  
High Refractive Index ◽  
Radiation Shielding ◽  
Lead Free ◽  
Human Beings ◽  
High Quality ◽  
Barium Compounds ◽  
Set Up

Many difference useful and decorative articles have been made from glasses over the centuries, especially lead-containing glasses. Due to harmful effects of lead from glass fabrication process on human beings and considering the health as well as the environmental issues, many researchers tried to produce leadless glasses using some heavy chemical elements such as barium, bismuth and zirconium. Nowadays, barium compounds seemed to be satisfactory and to be able to increase the refractive index. For production of high quality crystal glasses with high refractive index in Thailand, most raw materials including high quality sand have been imported. Because, Thailand, in fact, is rich in many kinds of raw materials for glass manufacturing, therefore, this work is set up to study the fabrication of the lead-free high refractive index glasses using local sand and barite as the main raw materials. After complete melting, the physical and optical properties of the prepared glass samples were determined to compare these properties with those of glasses prepared from foreign sand. It was found that the prepared glasses produced from local raw materials were suitably for restoration, decoration, radiation shielding, as well as glass jewelry. These glasses can be considered as one of the environmental friendly materials.

scholarly journals Investigation of directivity of the nanoantenna by its inherent resonant states

2021 ◽  
Vol 2015 (1) ◽  
pp. 012002
Author(s):  
Rajan Agrahari ◽  
Hadi K. Shamkhi
Keyword(s):  
Refractive Index ◽  
Quality Factor ◽  
Quasinormal Mode ◽  
High Quality Factor ◽  
Dielectric Cylinder ◽  
High Quality ◽  
Geometrical Symmetry ◽  
Resonant States

Abstract We present a quasinormal mode (QNM) approach for modeling the nanoantenna and describe the response of localized dielectric cylinder resonators. The inherent resonant states of the dielectric cylinder nanocavity are investigated for modified and reduced geometrical symmetry. We find some modes contributing mainly to the directivity and have a high-quality factor. The variation of the eigenmodes with cylinder height and substrate refractive index has also been investigated.

High-quality-factor multiple Fano resonances for refractive index sensing

2018 ◽  
Vol 43 (8) ◽  
pp. 1842 ◽  
Author(s):  
Yuebian Zhang ◽  
Wenwei Liu ◽  
Zhancheng Li ◽  
Zhi Li ◽  
Hua Cheng ◽  
...  
Keyword(s):  
Refractive Index ◽  
Quality Factor ◽  
High Quality Factor ◽  
Fano Resonances ◽  
High Quality ◽  
Refractive Index Sensing

DNA Biosensor on Optical Nanograting Structure

2015 ◽  
Vol 804 ◽  
pp. 199-202
Author(s):  
Naphat Chathirat ◽  
Charndet Hruanun ◽  
Amporn Poyai
Keyword(s):  
Refractive Index ◽  
Reflectance Spectrum ◽  
Specific Binding ◽  
Optical Biosensor ◽  
Optical Path ◽  
Wavelength Shift ◽  
Sensor Surface ◽  
High Quality ◽  
Reflectivity Spectra ◽  
Target Dna

We present a nanograting optical biosensor device, fabricated by photolithography, which is sensitive to changes in refractive index at the sensor surface. via changes in the reflectivity spectra. The grating was created by etching of a silicon nitride (Si3N4) film, which has a refractive index of 2.01, resulting in an array of Si3N4 pillars. The grating was coated by the high quality spin on glass material which has a low effective refractive index <1.50. The surface was functionalised with a layer of probe biomolecules for specific binding of the target DNA. Immobilization of the probe molecules was carried out via streptavidin – biotin interaction, the biotin modified ssDNA oligonucleotide probes were 23 bases in length (1010 copies/μl) and the sequence of the complementary ssDNA was 5’-TAC TCA TAC TTG AGG TTG AAA TT-3’(10, 100 and 1000 copies/μl). Results of the experiment showed that when molecules attached to the surface of the device, the position of the reflectance spectrum shifted due to the change of the optical path of light that is coupled into the nanograting structure. The extent of the wavelength shift (Δλ) of the peaks could be used to quantify the amount of materials bound to the sensor surface.

Simulation of a Ridge-Type Semiconductor Laser with Transversal Diffraction Gratings

2021 ◽  
Author(s):  
Tatsuhiro Hirose ◽  
Takahiro Numai
Keyword(s):  
Semiconductor Laser ◽  
Semiconductor Lasers ◽  
Light Output ◽  
Diffraction Gratings ◽  
Transverse Mode ◽  
Type Semiconductor ◽  
Horizontal Transverse Mode

Abstract This paper reports on improvement of stability of the fundamental horizontal transverse mode in a ridge-type semiconductor laser by incorporating transversal diffraction gratings. Kinks do not appear in current versus light-output curves by appropriately designing the number of the grating periods when the mesa width is 5 μm in which kinks exist in current versus light-output curves for conventional ridge-type semiconductor lasers.

A Terahertz Metamaterial Absorber Based Refractive Index Sensor with High Quality Factor

2021 ◽  
Author(s):  
Sagnik Banerjee ◽  
Uddipan Nath ◽  
Shruti ◽  
Amitkumar V. Jha ◽  
Sasmita Pahadsingh ◽  
...  
Keyword(s):  
Refractive Index ◽  
Quality Factor ◽  
Metamaterial Absorber ◽  
High Quality Factor ◽  
Refractive Index Sensor ◽  
High Quality

scholarly journals High quality factor photonic crystal filter at k ≈0 and its application for refractive index sensing

2017 ◽  
Vol 25 (9) ◽  
pp. 10536 ◽  
Author(s):  
Yonghao Liu ◽  
Shuling Wang ◽  
Deyin Zhao ◽  
Weidong Zhou ◽  
Yuze Sun
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Quality Factor ◽  
High Quality Factor ◽  
High Quality ◽  
Refractive Index Sensing

scholarly journals Roasting Effect on the Nutritional and Cosmetic Potential of Citrullus Lanatus Kernels Oil

2017 ◽  
Vol 6 (3) ◽  
pp. 11
Author(s):  
Guede Seri Serge ◽  
Gbogouri Grodji Albarin ◽  
Soro Doudjo ◽  
Koffi Kouame Kevin ◽  
Brou Kouakou ◽  
...  
Keyword(s):  
Refractive Index ◽  
Specific Gravity ◽  
Physicochemical Properties ◽  
Citrullus Lanatus ◽  
Physicochemical Characteristics ◽  
Sub Saharan Africa ◽  
Cyanogenic Glycosides ◽  
High Quality ◽  
Cold Press ◽  
Sub Saharan

The objective of this study was to evaluate the effect of roasting on the nutritional and cosmetic potential of oil extracted from kernels of C. lanatus, which is one of the most widespread Cucurbitaceae species in Sub-Saharan Africa. The dried kernels (DKO) and roasted kernels (RKO) oils were extracted by cold press and hot using hexane. The physicochemical properties of these oils were evaluated. The results showed that C. lanatus roasted kernels were important sources of lipids (40.12 %) and protein (37.50 %). Oil extracted by press was of high quality, compared to that extracted by hexane. The study of the roasting effect revealed that the physicochemical characteristics of DKO and RKO oils were significantly different, with the exception of their specific gravity (≈ 0.9) and their refractive index (≈ 1.47). The absorbance of the two oils decreased in the range of UV-A and UV-B wavelengths. Both oils had low oxalates content (≈ 0.05 %) and were free of phytates and cyanogenic glycosides. All these features suggest that the roasted kernels oil of the C. lanatus could be used in food and cosmetic industries.

Silicon Nitride Deposited at Very Low Silane Pressures Using Electron Cyclotron Resonance Plasmas

1992 ◽  
Vol 284 ◽  
Author(s):  
J. R. Flemish ◽  
R. Pfeffer ◽  
W. Buchwald ◽  
K. A. Jones
Keyword(s):  
Refractive Index ◽  
Silicon Nitride ◽  
Microwave Power ◽  
Material Properties ◽  
Cyclotron Resonance ◽  
Total Pressure ◽  
Electron Cyclotron Resonance ◽  
High Quality ◽  
Deposition Rates ◽  
Hydrogen Incorporation

ABSTRACTWe report on the material properties of SiNx:H films deposited using a 2% SiH4/N2 mixture with additional N2 in an ECR reactor. Deposition rates, refractive index, and stoichiometry have been characterized using ellipsometry, Rutherford backscattering spectroscopy, and infrared spectroscopy. Reactor conditions of 2m Torr total pressure, 650W microwave power, and substrate temperature of 250°C result in high quality, stoichiometric silicon nitride. With a SiH4/N2 ratio = 0.003, hydrogen incorporation is approximately 1.5% and the refractive index is nr =2.0. Lower microwave power and a higher SiH4/N2 ratio result in slightly N-rich films which is attributable to increased H-incorporation. Higher total pressure results in significantly enhanced deposition rates, but with greatly increased H and O content.

scholarly journals Structural, Linear and Nonlinear Optical Properties of Zn@CdO Nanostructured Thin Films: A Quantitative Comparison With Dft

2021 ◽  
Author(s):  
Ziaul Raza Khan ◽  
M. Gandouzi ◽  
Adullah S. Alshammari ◽  
M. Bouzidi ◽  
Mohd. Shkir ◽  
...  
Keyword(s):  
Thin Films ◽  
Density Functional Theory ◽  
Refractive Index ◽  
Density Functional ◽  
Nonlinear Optical ◽  
Absorption Index ◽  
Optical Parameters ◽  
Functional Theory ◽  
Nanostructured Films ◽  
Zn Doping

Abstract This paper presents experimental and density functional theory (DFT) investigations of Zn doping role in the Zn@CdO ternary system. Zn doped CdO nanostructures with different Zn concentrations were successfully casted on glass substrates by sol-gel spin coating method. Cubic Zn@CdO structured ternary alloyed nanostructures thin films with 0.0%, 1.0%, 2.0% and 3.0% wt. Zn concentrations were obtained. An enhancement in the lateral growth of CdO cauliflower-like nanostructures was observed after Zn addition which leads to a 2D growth of nanostructured films with improved continuity. The effect of Zn doping on the linear optical parameters such as the optical band gap, the absorption index and the refractive index were also investigated. A remarkable blue shift in the band edge was observed as Zn is incorporated into the CdO matrix. In addition, the third order nonlinear optical parameters χ(3) and n2 were calculated and found to be about 2.89×10-12 - 4.33×10-14 esu and 2.89×10-12 - 4.33×10-14 esu; respectively. A density functional theory (DFT) based Wien2k package was utilized to theoretically investigate the lattice parameters, the electronic structure, the absorption index and the refractive index of the Zn@CdO ternary nanoalloys. The role of Zn doping on the aforesaid properties was theoretically investigated for 3.125%, 6.25%, 12.5% and 25% Zn doping concentrations and was compared with the experimentally determined parameters. The combined theoretical and experimental investigations presented herein along with the detailed discussion of the obtained findings would provide a deep understanding of the opto-electronic behavior of the Zn doped CdO nanostructured films as well as their suitability for devices applications.

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