EFFECTS OF NONMAGNETIC SPHERES ON THE MAGNETO-OPTICS OF Fe3O4 COMPOSITE MAGNETIC FLUIDS

2010 ◽  
Vol 24 (28) ◽  
pp. 5553-5560 ◽  
Author(s):  
M. X. XU ◽  
W. G. WANG ◽  
Y. Y. ZHANG
Keyword(s):  
Optical Properties ◽  
Linear Dichroism ◽  
Magnetic Fluids ◽  
Optical Devices ◽  
Optical Characteristics ◽  
Order Structure ◽  
Polystyrene Sphere ◽  
Frequency Method ◽  
Double Frequency ◽  
Further Development

Both pure Fe 3 O 4 magnetic fluids and containing polystyrene sphere composite magnetic fluids have been prepared. The magneto-optical characteristics such as magnetic birefringence and linear dichroism of both magnetic fluids and composite magnetic fluids have been investigated by the magneto-optically modulated double-frequency method. The results reveal that the order structure of nonmagnetic spheres and the interactions between the spheres and the neighbor magnetic chains of Fe 3 O 4 particles in the composite magnetic fluids strongly affect the magneto-optical properties. The magneto-optical properties from the study can be used for further development of related new optical devices.

scholarly journals Scalable Production of Boron Quantum Dots for Broadband Ultrafast Nonlinear Optical Performance

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 687
Author(s):  
Shuolei Meng ◽  
Qianyuan Chen ◽  
Hongjian Lin ◽  
Feng Zhou ◽  
Youning Gong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Relaxation Time ◽  
Nonlinear Optical ◽  
Average Diameter ◽  
Optical Devices ◽  
Nonlinear Optical Properties ◽  
Saturable Absorption ◽  
Nonlinear Optical Susceptibility ◽  
Tandem Structure

A simple and effective approach based on the liquid phase exfoliation (LPE) method has been put forward for synthesizing boron quantum dots (BQDs). By adjusting the interactions between bulk boron and various solvents, the average diameter of produced BQDs is about 7 nm. The nonlinear absorption (NLA) responses of as-prepared BQDs have been systematically studied at 515 nm and 1030 nm. Experimental results prove that BQDs possess broadband saturable absorption (SA) and good third-order nonlinear optical susceptibility, which are comparable to graphene. The fast relaxation time and slow relaxation time of BQDs at 515 nm and 1030 nm are about 0.394–5.34 ps and 4.45–115 ps, respectively. The significant ultrafast nonlinear optical properties can be used in optical devices. Here, we successfully demonstrate all-optical diode application based on BQDs/ReS2 tandem structure. The findings are essential for understanding the nonlinear optical properties in BQDs and open a new pathway for their applications in optical devices.

scholarly journals Optical Properties of Polypropylene upon Recycling

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Felice De Santis ◽  
Roberto Pantani
Keyword(s):  
Optical Properties ◽  
Rheological Properties ◽  
Isotactic Polypropylene ◽  
Food Packaging ◽  
Polymeric Materials ◽  
Optical Characteristics ◽  
Cooling Rates ◽  
Commercial Grade

In the last few years there has been an increasing interest in the possibility of recycling polymeric materials, using physical recycling. However, is it well known that polymers experience a depletion of all the properties upon recycling. These effects have been widely characterized in the literature for what concerns the mechanical or rheological properties. The changes of optical properties after recycling have been much less studied, even if, especially in food packaging, optical characteristics (above all the opacity) are of extreme importance, and thus it is quite significant to assess the effect of recycling on these properties. In this work, the influence of recycling steps on the opacity of films of a commercial grade of isotactic polypropylene (i-PP) was studied. The material was extruded several times to mimic the effect of recycling procedures. After extrusion, films were obtained by cooling samples of material at different cooling rates. The opacity of the obtained films was then measured and related to their crystallinity and morphology. It was found that opacity generally increases on increasing the amount ofαphase and for the same amount ofαphase on increasing the size of the spherulites.

scholarly journals All-Optical Modulation Technology Based on 2D Layered Materials

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 92
Author(s):  
Hongyan Yang ◽  
Yunzheng Wang ◽  
Zian Cheak Tiu ◽  
Sin Jin Tan ◽  
Libo Yuan ◽  
...  
Keyword(s):  
Optical Properties ◽  
Communication Systems ◽  
Near Infrared ◽  
2D Materials ◽  
Optical Devices ◽  
Optical Systems ◽  
Optical Modulation ◽  
Wavelength Converter ◽  
Optical Modulators ◽  
All Optical

In the advancement of photonics technologies, all-optical systems are highly demanded in ultrafast photonics, signal processing, optical sensing and optical communication systems. All-optical devices are the core elements to realize the next generation of photonics integration system and optical interconnection. Thus, the exploration of new optoelectronics materials that exhibit different optical properties is a highlighted research direction. The emerging two-dimensional (2D) materials such as graphene, black phosphorus (BP), transition metal dichalcogenides (TMDs) and MXene have proved great potential in the evolution of photonics technologies. The optical properties of 2D materials comprising the energy bandgap, third-order nonlinearity, nonlinear absorption and thermo-optics coefficient can be tailored for different optical applications. Over the past decade, the explorations of 2D materials in photonics applications have extended to all-optical modulators, all-optical switches, an all-optical wavelength converter, covering the visible, near-infrared and Terahertz wavelength range. Herein, we review different types of 2D materials, their fabrication processes and optical properties. In addition, we also summarize the recent advances of all-optical modulation based on 2D materials. Finally, we conclude on the perspectives on and challenges of the future development of the 2D material-based all-optical devices.

Magneto-Optical Properties of FeBO3 and YFeO3 and Their Application to Optical Devices

Ferrites ◽  
1982 ◽  
pp. 782-786
Author(s):  
Masanori Abe ◽  
Manabu Gomi ◽  
Shoichiro Nomura
Keyword(s):  
Optical Properties ◽  
Optical Devices

scholarly journals Modelling the Optical Properties of Soot Particles under Various Aging Conditions

Atmosphere ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 86
Author(s):  
Kangwei Li ◽  
Mingming Yan ◽  
Jiandong Shen ◽  
Xin Zhang ◽  
Chunmei Geng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chemical Species ◽  
Absorption Efficiency ◽  
Optical Characteristics ◽  
Core Shell ◽  
Mixing State ◽  
Coating Materials ◽  
Soot Particles ◽  
The Core ◽  
Aging Conditions

As atmospheric fresh soot particles age, they become coated with other chemical species. This transforms their physicochemical properties and affects their optical characteristics, which is of great importance to air quality, the environment and climate change. One of the predominantly occurring states of soot particles in the ambient environment is the core-shell mixing state. In this study, we used the core-shell model to calculate the optical absorption, scattering and extinction efficiency, absorption proportion and absorption exponent of coated soot particles. We then investigated the effects of different core sizes (D0), incident wavelengths (λ), coating materials and coating thicknesses on these optical characteristics. Absorption efficiency and absorption proportion of soot particles decreased as the coating became thicker, at core sizes of D0 = 20, 50 and 100 nm and λ = 405, 532 and 781 nm, regardless of the type of coating material. As the coating thickness increased, the absorption exponent (β) of inorganic-coated soot particles tended to rise and then fall, while the β value of organic-coated soot particles kept increasing. Our results advance our scientific understanding of the interaction of optical properties with chemical composition, mixing state, and aging processes of soot particles in the atmosphere.

SYMMETRY AND ELECTRO-OPTICAL PROPERTIES OF NANOTUBES

2002 ◽  
Vol 01 (03n04) ◽  
pp. 313-325 ◽  
Author(s):  
M. DAMNJANOVIĆ ◽  
I. MILOŠEVIĆ ◽  
T. VUKOVIĆ ◽  
B. NIKOLIĆ ◽  
E. DOBARDŽIĆ
Keyword(s):  
Carbon Nanotubes ◽  
Optical Properties ◽  
Density Functional ◽  
Tight Binding ◽  
Optical Characteristics ◽  
Optical Transitions ◽  
Matrix Elements ◽  
Selection Rules ◽  
Single Wall Carbon ◽  
Quantum Numbers

The symmetry of single-wall carbon and inorganic tubes is reviewed. For the carbon nanotubes it is used to get the full set of quantum numbers, in the efficient precision (combined density functional and tight-binding methods) calculation of electronic bands and their complete assignation, to obtain the selection rules for optical transitions and the momenta matrix elements for the Bloch eigen-states. The optical characteristics are thoroughly found, and discussed.

scholarly journals Optical Properties of Electrically Active Gold Nanoisland Films Enabled with Interfaced Liquid Crystals

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 290 ◽  
Author(s):  
Hung-Chi Yen ◽  
Tsung-Rong Kuo ◽  
Chun-Ta Wang ◽  
Jia-De Lin ◽  
Chia-Chun Chen ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Liquid Crystal ◽  
Active Control ◽  
Resonance Wavelength ◽  
Hybrid Structure ◽  
Optical Devices ◽  
Nanostructured Surface ◽  
Wavelength Tunability ◽  
Nanoisland Film

A system comprising a gold nanoisland film (Au NIF) covered with a liquid crystal (LC) material is introduced. By applying a voltage across the LC bulk, we demonstrate that changes in the refractive-index and orientation significantly modified the hybrid plasmonic–photonic resonances of the Au NIF. The hybrid structure enabled active control of the spectrum of the resonance wavelength of the metallic nanoisland by means of an externally applied electric field. Our modeling supports the observed results in LC/Au NIF. In a combination of the nanostructured surface with birefringent LCs, nonpolarized wavelength tunability of ~15 nm and absorbance tunability of ~0.024 were achieved in the visible wavelength, opening the door to optical devices and nanoscale sensors.

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