scholarly journals Silicon Oxycarbide Platform for Integrated Photonics

2020 ◽  
Vol 38 (4) ◽  
pp. 784-791 ◽  
Author(s):  
Faisal Ahmed Memon ◽  
Francesco Morichetti ◽  
Matteo Cantoni ◽  
Claudio Somaschini ◽  
Marco Asa ◽  
...  
Keyword(s):  
Silicon Oxycarbide ◽  
Integrated Photonics

Programmable Integrated Photonics

2020 ◽  
Author(s):  
José Capmany ◽  
Daniel Pérez
Keyword(s):  
Integrated Circuit ◽  
Performance Monitoring ◽  
Low Cost ◽  
Limiting Factors ◽  
External Control ◽  
Integrated Photonics ◽  
New Paradigm ◽  
Photonic Integrated Circuit ◽  
And Performance ◽  
Application Fields

Programmable Integrated Photonics (PIP) is a new paradigm that aims at designing common integrated optical hardware configurations, which by suitable programming can implement a variety of functionalities that, in turn, can be exploited as basic operations in many application fields. Programmability enables by means of external control signals both chip reconfiguration for multifunction operation as well as chip stabilization against non-ideal operation due to fluctuations in environmental conditions and fabrication errors. Programming also allows activating parts of the chip, which are not essential for the implementation of a given functionality but can be of help in reducing noise levels through the diversion of undesired reflections. After some years where the Application Specific Photonic Integrated Circuit (ASPIC) paradigm has completely dominated the field of integrated optics, there is an increasing interest in PIP justified by the surge of a number of emerging applications that are and will be calling for true flexibility, reconfigurability as well as low-cost, compact and low-power consuming devices. This book aims to provide a comprehensive introduction to this emergent field covering aspects that range from the basic aspects of technologies and building photonic component blocks to the design alternatives and principles of complex programmable photonics circuits, their limiting factors, techniques for characterization and performance monitoring/control and their salient applications both in the classical as well as in the quantum information fields. The book concentrates and focuses mainly on the distinctive features of programmable photonics as compared to more traditional ASPIC approaches.

scholarly journals Insights into the Microstructural Evolution Occurring during Pyrolysis of Metal-Modified Ceramers Studied through Selective SiO2 Removal

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3276
Author(s):  
Aitana Tamayo ◽  
Juan Rubio ◽  
Fausto Rubio ◽  
Mᵃ Angeles Rodriguez
Keyword(s):  
Structural Characteristics ◽  
Domain Size ◽  
Ceramic Composites ◽  
Silicon Oxycarbide ◽  
Crosslinking Degree ◽  
Molecular Precursors ◽  
Textural Characterization ◽  
Polymer Derived Ceramic ◽  
Ultimate Properties ◽  
Lower Carbon

Silicon oxycarbide ceramers containing 5% aluminum, zirconium, and cobalt with respect to the total Si amount are prepared from a commercial polysiloxane and molecular precursors and pyrolyzed at temperatures ranging from 500 to 1000 °C. HF etching is carried out to partially digest the silica phase, thus revealing structural characteristics of the materials, which depend upon the incorporated heteroatom. From the structural and textural characterization, it was deduced that when Al enters into the ceramer structure, the crosslinking degree is increased, leading to lower carbon domain size and carbon incorporation as well. On the contrary, the substitution by Zr induced a phase-separated SiO2-ZrO2 network with some degree of mesoporosity even at high pyrolysis temperatures. Co, however, forms small carbidic crystallites, which strongly modifies the carbonaceous phase in such a way that even when it is added in a small amount and in combination with other heteroatoms, this transient metal dominates the structural characteristics of the ceramer material. This systematic study of the ceramer compounds allows the identification of the ultimate properties of the polymer-derived ceramic composites.

scholarly journals Porosity and nanostructure of silicon oxycarbide derived carbon

Open Ceramics ◽  
2021 ◽  
pp. 100116
Author(s):  
Ipsita P. Swain ◽  
Nishit Sadual ◽  
Shantanu K. Behera
Keyword(s):  
Silicon Oxycarbide

scholarly journals Radiation Tolerance in Nano-Structured Crystalline Fe(Cr)/Amorphous SiOC Composite

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 147
Author(s):  
Qing Su ◽  
Tianyao Wang ◽  
Lin Shao ◽  
Michael Nastasi
Keyword(s):  
Amorphous Silicon ◽  
Grain Growth ◽  
Irradiation Dose ◽  
Room Temperature ◽  
Silicon Oxycarbide ◽  
Radiation Response ◽  
Radiation Tolerance ◽  
Width Direction ◽  
Cr Film ◽  
Radiation Tolerant

The management of irradiation defects is one of key challenges for structural materials in current and future reactor systems. To develop radiation tolerant alloys for service in extreme irradiation environments, the Fe self-ion radiation response of nanocomposites composed of amorphous silicon oxycarbide (SiOC) and crystalline Fe(Cr) were examined at 10, 20, and 50 displacements per atom damage levels. Grain growth in width direction was observed to increase with increasing irradiation dose in both Fe(Cr) films and Fe(Cr) layers in the nanocomposite after irradiation at room temperature. However, compared to the Fe(Cr) film, the Fe(Cr) layers in the nanocomposite exhibited ~50% less grain growth at the same damage levels, suggesting that interfaces in the nanocomposite were defect sinks. Moreover, the addition of Cr to α-Fe was shown to suppress its grain growth under irradiation for both the composite and non-composite case, consistent with earlier molecular dynamic (MD) modeling studies.

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