scholarly journals Physical Properties and Behaviour of Highly Bi-Substituted Magneto-Optic Garnets for Applications in Integrated Optics and Photonics

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Mohammad Nur-E-Alam ◽  
Mikhail Vasiliev ◽  
Kamal Alameh ◽  
Viacheslav Kotov
Keyword(s):  
Thin Film ◽  
Physical Properties ◽  
Integrated Optics ◽  
High Performance ◽  
Functional Materials ◽  
Visible Spectral Region ◽  
Nanocomposite Films ◽  
Wide Range ◽  
Iron Garnet ◽  
Magneto Optic

Rare-earth and Bi-substituted iron garnet thin film materials exhibit strong potential for application in various fields of science and frontier optical technologies. Bi-substituted iron garnets possess extraordinary optical and MO properties and are still considered as the best MO functional materials for various emerging integrated optics and photonics applications. However, these MO garnet materials are rarely seen in practical photonics use due to their high optical losses in the visible spectral region. In this paper, we report on the physical properties and magneto-optic behaviour of high-performance RF sputtered highly bismuth-substituted iron garnet and garnet-oxide nanocomposite films of generic composition type (Bi, Dy/Lu)3(Fe, Ga/Al)5O12. Our newly synthesized garnet materials form high-quality nanocrystalline thin film layers which demonstrate excellent optical and MO properties suitable for a wide range of applications in integrated optics and photonics.

scholarly journals Enhanced Magneto-Optic Properties in Sputtered Bi- Containing Ferrite Garnet Thin Films Fabricated Using Oxygen Plasma Treatment and Metal Oxide Protective Layers

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5113
Author(s):  
V. Kotov ◽  
M. Nur-E-Alam ◽  
M. Vasiliev ◽  
K. Alameh ◽  
D. Balabanov ◽  
...  
Keyword(s):  
Thin Film ◽  
Metal Oxide ◽  
Plasma Treatment ◽  
Visible Spectral Region ◽  
Oxygen Plasma Treatment ◽  
Electromagnetic Spectrum ◽  
Material System ◽  
Garnet Films ◽  
Iron Garnet ◽  
Magneto Optic

Magneto-optic (MO) imaging and sensing are at present the most developed practical applications of thin-film MO garnet materials. However, in order to improve sensitivity for a range of established and forward-looking applications, the technology and component-related advances are still necessary. These improvements are expected to originate from new material system development. We propose a set of technological modifications for the RF-magnetron sputtering deposition and crystallization annealing of magneto-optic bismuth-substituted iron-garnet films and investigate the improved material properties. Results show that standard crystallization annealing for the as-deposited ultrathin (sputtered 10 nm thick, amorphous phase) films resulted in more than a factor of two loss in the magneto-optical activity of the films in the visible spectral region, compared to the liquid-phase grown epitaxial films. Results also show that an additional 10 nm-thick metal-oxide (Bi2O3) protective layer above the amorphous film results in ~2.7 times increase in the magneto-optical quality of crystallized iron-garnet films. On the other hand, the effects of post-deposition oxygen (O2) plasma treatment on the magneto-optical (MO) properties of Bismuth substituted iron garnet thin film materials are investigated. Results show that in the visible part of the electromagnetic spectrum (at 532 nm), the O2 treated (up to 3 min) garnet films retain higher specific Faraday rotation and figures of merit compared to non-treated garnet films.

scholarly journals Synthesis of high-performance magnetic garnet materials and garnet-bismuth oxide nanocomposites using physical vapor deposition followed by high-temperature crystallization

2011 ◽  
Vol 83 (11) ◽  
pp. 1971-1980 ◽  
Author(s):  
Mohammad Nur-E-Alam ◽  
Mikhail Vasiliev ◽  
Kamal Alameh ◽  
Viacheslav Kotov
Keyword(s):  
High Temperature ◽  
Optical Sensors ◽  
Physical Vapor Deposition ◽  
High Performance ◽  
Near Infrared ◽  
Rf Sputtering ◽  
Nanocomposite Films ◽  
Sputtering Deposition ◽  
Garnet Phase ◽  
Iron Garnet

Bi-substituted iron garnet (Bi:IG) compounds synthesized in thin film form are the best semi-transparent magneto-optical (MO) materials for applications in magnetic recording, optical sensors, and photonics. These materials can possess attractive magnetic properties and the highest specific Faraday rotation in the visible and near-infrared spectral regions, if the deposited layers contain a high volumetric fraction of the garnet phase and possess high-quality surfaces and microstructure. In this paper, we study the effects of various deposition and annealing process parameters on the properties of Bi:IG and garnet-oxide nanocomposite films of several composition types fabricated using radio-frequency (RF) sputtering deposition followed by high-temperature isothermal crystallization. We also investigate the kinetics of garnet phase formation within a garnet-Bi-oxide nanocomposite material.

Electro-Optic and Magneto-Optic Photonic Bandgap Materials Kevin

2004 ◽  
Vol 834 ◽  
Author(s):  
Y. Zou ◽  
Yanyun Wang ◽  
Kewen Li ◽  
Hua Jiang ◽  
Samir K. Mondal ◽  
...  
Keyword(s):  
Thin Film ◽  
Semiconductor Device ◽  
Photonic Bandgap ◽  
Organic Chemical ◽  
High Quality ◽  
Glass Substrates ◽  
Photonic Bandgap Materials ◽  
Electro Optic ◽  
Iron Garnet ◽  
Magneto Optic

ABSTRACTThis work presents a study of electro-optic and magneto-optic films made by a Metal-Organic Chemical Liquid Deposition (MOCLD) method. Electro-optic thin film, La-modified Pb(Mg1/3Nb2/3)O3-PbTiO3 (PLMNT) and magneto-optic thin film, rare earth doped yittrium iron garnet (YIG) have been grown at different conditions. Low temperature growth on buffered semiconductor substrates has been studied for semiconductor device integration. High quality PLMNT film with EO coefficient of 1x10-16 (m/V)2 was obtained with MOCLD. Doped and undoped YIG onto MgO and glass substrates and also onto buffered semiconductors were successfully deposited using MOCLD method. Several of these films had successful rotations that were of device quality. Based on these high quality functional films, two dimensional photonic bandgap waveguide structures were designed and simulated.

scholarly journals Application-Specific Oxide-Based and Metal-Dielectric Thin Film Materials Prepared by RF Magnetron Sputtering

2019 ◽  
Author(s):  
Mohammad Nur E Alam ◽  
Wade Lonsdale ◽  
Mikhail Vasiliev ◽  
Kamal Alameh
Keyword(s):  
Thin Film ◽  
Magnetron Sputtering ◽  
High Performance ◽  
Rf Magnetron Sputtering ◽  
Functional Material ◽  
Dielectric Thin Film ◽  
Material Systems ◽  
Application Specific ◽  
Magneto Optic

We report on the development of several different thin-film functional material systems prepared by RF magnetron sputtering at Edith Cowan University nanofabrication labs. We conduct research on the design, prototyping, and practical fabrication of high-performance magneto-optic (MO) materials, oxide based sensor components, and heat regulation coatings for advanced construction and solar windows.

Effects of Microwave and Furnace Annealing for P-Type SnO Thin Film Material in Oxygen Ambient

2021 ◽  
Vol 21 (9) ◽  
pp. 4763-4767
Author(s):  
Yu-Xin Zhang ◽  
Chien-Hung Wu ◽  
Li-Wei Yeh ◽  
Yi-Ming Chen ◽  
Kow-Ming Chang ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
High Performance ◽  
Transparent Conductive Oxide ◽  
Film Material ◽  
High Electron ◽  
Flat Panel Display ◽  
Furnace Annealing ◽  
Wide Range ◽  
C 30

Transparent conductive oxide (TCO) semiconductors are attracted considerable attention due to a wide range of applications, such as flat panel display (FPD), touch panels, solar cells, and other optoelectronic devices. Owing to the different carrier conduction paths between n-type and P-type TCOs, the n-type TCO used in TFTs usually have high Ion/Ioff current ratio (>107) and high electron mobility (>10 cm2/V·s), P-type TCO TFTs are both lower than that of n-type one. For complementary circuits design and applications, however, both P-type and n-type semiconductor materials are equally important. For SnO thin films, it is important to adjust the ratio of Sn2+ (SnO P-type) and Sn4+ (SnO2 n-type) in order to modulate the electrical characteristics. In this investigation of post treatment for SnO thin films, both microwave annealing (MWA) and furnace annealing process with 02 ambient are studied. The results show that SnO thin films are optimized at 300 °C, 30 minutes furnace annealing, the P-type SnO/SnO2 thin film shows surface mean roughness 0.168 nm, [Sn2+]/[Sn4+] ratio as 0.838, at least 80% transmittance between 380 nm-700 nm visible light. Withthe results, SnO can be even used to fabricate high performance P-type thin film transistors (TFTs) device for future applications.

scholarly journals Extraction of Nanochitin from Marine Resources and Fabrication of Polymer Nanocomposites: Recent Advances

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1664
Author(s):  
Blessy Joseph ◽  
Rubie Mavelil Sam ◽  
Preetha Balakrishnan ◽  
Hanna J. Maria ◽  
Sreeraj Gopi ◽  
...  
Keyword(s):  
High Performance ◽  
Economic Value ◽  
Chemical Characterization ◽  
Functional Materials ◽  
Biological Properties ◽  
Good Opportunity ◽  
Physico Chemical ◽  
Mechanical Methods ◽  
Wide Range ◽  
Food Residues

Industrial sea food residues, mainly crab and shrimp shells, are considered to be the most promising and abundant source of chitin. In-depth understanding of the biological properties of chitin and scientific advancements in the field of nanotechnology have enabled the development of high-performance chitin nanomaterials. Nanoscale chitin is of great economic value as an efficient functional and reinforcement material for a wide range of applications ranging from water purification to tissue engineering. The use of polymers and nanochitin to produce (bio) nanocomposites offers a good opportunity to prepare bioplastic materials with enhanced functional and structural properties. Most processes for nanochitin isolation rely on the use of chemical, physical or mechanical methods. Chitin-based nanocomposites are fabricated by various methods, involving electrospinning, freeze drying, etc. This review discusses the progress and new developments in the isolation and physico-chemical characterization of chitin; it also highlights the processing of nanochitin in various composite and functional materials.

Nanoporous Metals for Catalytic and Optical Applications

MRS Bulletin ◽  
2009 ◽  
Vol 34 (8) ◽  
pp. 569-576 ◽  
Author(s):  
Yi Ding ◽  
Mingwei Chen
Keyword(s):  
Optical Properties ◽  
Fuel Cell ◽  
High Performance ◽  
Electrode Materials ◽  
Three Dimensional ◽  
Functional Materials ◽  
Porous Network ◽  
Highly Active ◽  
Wide Range ◽  
Nanoporous Metals

AbstractNanoporous metals (NPMs) made by dealloying represent a class of functional materials with the unique structural properties of mechanical rigidity, electrical conductivity, and high corrosion resistance. They also possess a porous network structure with feature dimensions tunable within a wide range from a few nanometers to several microns. Coupled with a rich surface chemistry for further functionalization, NPMs have great potential for applications in heterogeneous catalysis, electrocatalysis, fuel cell technologies, biomolecular sensing, surface-enhanced Raman scattering (SERS), and plasmonics. This article summarizes recent advances in some of these areas and, in particular, we focus on the discussion of microstructure, catalytic, and optical properties of nanoporous gold (NPG). With advanced electron microscopy, three-dimensional tomographic reconstructions of NPG have been realized that yield quantitative characterizations of key morphological parameters involved in the intricate structure. Catalytic and electrocatalytic investigations demonstrate that bare NPG is already catalytically active for many important reactions such as CO and glucose oxidation. Surface functionalization with other metals, such as Pt, produces very efficient electrocatalysts, which have been used as promising fuel cell electrode materials with very low precious metal loading. Additionally, NPG and related materials possess outstanding optical properties in plasmonics and SERS. They hold promise to act as highly active, stable, and economically affordable substrates in high-performance instrumentation applications for chemical inspection and biomolecular diagnostics. Finally, we conclude with some perspectives that appear to warrant future investigation.

scholarly journals Functional Nanocomposite Films of Poly(Lactic Acid) with Well-Dispersed Chitin Nanocrystals Achieved Using a Dispersing Agent and Liquid-Assisted Extrusion Process

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4557
Author(s):  
Mitul Patel ◽  
Daniel Schwendemann ◽  
Giorgia Spigno ◽  
Shiyu Geng ◽  
Linn Berglund ◽  
...  
Keyword(s):  
Lactic Acid ◽  
High Performance ◽  
Functional Materials ◽  
Microscopy Study ◽  
Extrusion Process ◽  
Nanocomposite Films ◽  
Poly Lactic Acid ◽  
Dispersing Agent ◽  
Triethyl Citrate ◽  
Performance Functional

The development of bio-based nanocomposites is of high scientific and industrial interest, since they offer excellent advantages in creating functional materials. However, dispersion and distribution of the nanomaterials inside the polymer matrix is a key challenge to achieve high-performance functional nanocomposites. In this context, for better dispersion, biobased triethyl citrate (TEC) as a dispersing agent in a liquid-assisted extrusion process was used to prepare the nanocomposites of poly (lactic acid) (PLA) and chitin nanocrystals (ChNCs). The aim was to identify the effect of the TEC content on the dispersion of ChNCs in the PLA matrix and the manufacturing of a functional nanocomposite. The nanocomposite film’s optical properties; microstructure; migration of the additive and nanocomposites’ thermal, mechanical and rheological properties, all influenced by the ChNC dispersion, were studied. The microscopy study confirmed that the dispersion of the ChNCs was improved with the increasing TEC content, and the best dispersion was found in the nanocomposite prepared with 15 wt% TEC. Additionally, the nanocomposite with the highest TEC content (15 wt%) resembled the mechanical properties of commonly used polymers like polyethylene and polypropylene. The addition of ChNCs in PLA-TEC15 enhanced the melt viscosity, as well as melt strength, of the polymer and demonstrated antibacterial activity.

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