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Lasers emitting around 2 μm (eye-safe spectral range) are of practical importance for remote sensing, spectroscopy and medicine. Such emission is typically achieved from Tm3+ (3F4 →3H6 transition) and Ho3+ ions (5I7 → 5I8 transition). The search for appropriate saturable absorbers (SAs) for passive Q-switching (PQS) of ∼2 μm lasers is still ongoing. While “slow” SAs, e.g. Cr2+:ZnS, are well-established,...
Ultrashort pulse (USP) fiber lasers are of great interest for their wide applications in telecommunication, frequency metrology field, dual comb spectroscopy, THz pulse spectroscopy and etc [1]. Hybrid mode-locking (ML) for USP generation have attracted a great attention due to their capabilities of enhancing pulse quality and providing reliable ML startup by taking advantage of a co-action of two...
Numerical simulation on the heat transfer characteristics of transformer oil based on carbon nanotubes in the winding was carried out. The simulation results predict the location and magnitude of hot-spot temperature. The volume fraction of carbon nanotubes is 0.5%. The velocity and turbulence kinetic energy of nanofluid are higher than those of normal transformer oil, which results in the hot-spot...
The paper investigated the current-voltage and dI/dV-characteristics of nanocontact “Niobium — Carbon nanotube (5,5) — Niobium” using the program Atomistix ToolKit with Virtual NanoLab. At computer simulation of transport characteristics of nanocontact the method of nonequilibrium Green's functions and the local density approximation were used. The current-voltage characteristics, the differential...
Carbon Nanotubes (CNTs) and graphene flakes have been of interest since the very beginning due to their extraordinary properties in many aspects. These properties include: high electron mobility in room temperatures, relatively high thermal conductivity and possibly the highest resistance to mechanical stress. Therefore, it is imperative to simulate various scenarios of CNT coated structures. This...
Dynamic measurements on carbon nanotube (CNT) multiscale glass fiber reinforced polymers (GFRPs) were performed to assess the usage of self-sensing composite structures in vibration environment. To achieve that purpose, a composite cantilever beam was tested in static and dynamic conditions. Applied strain was measured by means of strain gauges mounted on the tested specimen. Static measurements were...
Nanoengineered materials have exciting, untapped potential to develop high performance solar energy conversion systems. One example is in solar thermophotovoltaic devices, where solar energy can be harvested by converting broadband sunlight to narrowband thermal radiation tuned for a photovoltaic cell. We show how nanoengineered surfaces including a carbon nanotube absorber, photonic crystal emitter...
This paper presents a series of experiments demonstrating the capacity of single-walled carbon-nanotube (SWCNT)/liquid crystal (LC) mixtures to be trained by evolutionary algorithms to act as classifiers on linear and nonlinear binary datasets. The training process is formulated as an optimisation problem with hardware in the loop. The liquid SWCNT/LC samples used here are un-configured and with nonlinear...
Advanced memory technology based on carbon nanotubes (NRAM) has been shown to possess desired properties for implementation in a host of integrated systems due to demonstrated advantages of its operation including high speed (Nanotubes can switch state in picoseconds), high endurance (over a trillion), and low power (with essential zero standby power). The applicable integrated systems have markets...
In the past several decades, the increasing performance of integrated circuits has put increasing demands on thermal management solutions. The thermal interface resistance of a typical electronics package can often comprise the majority of the total thermal resistance. While much effort has been put into developing high conductivity materials for thermal interface material (TIM) applications, in practice...
Very high thermal conductivity of carbon nanotube (CNT) makes it an obvious choice in electronic cooling applications. But at the nanoscale, these CNTs face a limitation due to the interfacial thermal resistance commonly known as Kapitza resistance, prevailing between the carbon nanotube and coolant molecules at the solid-liquid boundary. Vibrational mismatch at the interface gives rise to the Kapitza...
Aim of this work is to describe the electronic driving system and the entire experimental setup realized in order to photo-ignite a gaseous fuel/air mixture enriched with Multi-wall carbon nanotubes (MWCNTs) with added metal impurities, makers of photo-ignition process. The realized electronic boards present different features such as variable flash brightness, pulse duration and high flash rate,...
This paper presents a realization of interconnects working in the THz range, based on the propagation of surface plasmonsw along carbon-based conductors, such as carbon nanotubes or graphene nanoribbons. Based on a quasi-classical transport model, the behavior of such interconnects is studied, highlighting not only the fascinating features of such realizations, but also the limiting factors due to...
Due to the rapid increases in current densities, wires, planar conductors and ground lines, become more and more vulnerable to electromigration. Future RF advanced packaging applications require new materials endowed of low electrical resistance, high reliability, chip-to-package interconnects, and improved thermal management. In this contribution, we introduce a multi-physics full-wave investigation...
Proofs of concept of CNTs based RF nanopackaging of mm wave circuits are presented in this review paper. Dedicated theoretical design tools based on EM simulations and equivalent models are described and validated. Theoretical results are presented and commented.
Developing novel security devices using nanotechnology has emerged as a promising new area since they offer higher reliability, small form factor, and anti-tampering features. Single-walled carbon nanotube (CNT) is promising to replace silicon as the future transistor channel material due to its superb electrical properties and intrinsic ultrathin body. However, several imperfections of this nanomaterial...
This paper presented a method for multiwalled carbon nanotubes (MWCNTs) fusion induced by electron beam irradiation inside scanning electron microscopy (SEM). The MWCNT was picked up from CNT bulk by nanorobotics manipulation system. The electron beam irradiation was introduced at the joint of two free end of MWCNTs. C-C bonds at the ends of CNTs were fused together. The method of this paper presented...
With the advent of Wireless Sensor Networks and the Internet of Things, the need for energy efficient components has increased significantly. Sensors consume sometimes a significant part of the energy budget of an autonomous system, while it is not always clear how to make them more efficient. Here we attempt to identify strategies for lowering power consumption in transducers. The discussion is constructed...
An approach to calculating integral conductivity of a model nanotube/dielectric composite system is discussed. Conductivity of random nanotube network formed in the dielectric medium is simulated considering tunneling conductivity between individual nanotubes being in close proximity and taking into account intrinsic conductivity of nanotubes.
We have developed the coating and microfabrication technique of the single walled carbon nanotubes and its composite with rubbers in the way compatible to the conventional device technology in order to incorporate the unique properties of SWCNTs, such as diversity of electrical properties depending on the charity, mechanical flexibility and stretchability arising from the formation of network structure,...
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