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Lightning strikes to overhead shield wires of transmission or distribution lines generate impulsive currents whose electromagnetic fields induce voltages on nearby phase conductors. Conventional calculations rely on mutual inductance and capacitance formulas that assume infinitely long parallel lines, an approximation that breaks down near the strike point where the fields are highly non-uniform. This paper presents a full electromagnetic analysis of the fields produced by the currents in the shield wire. T

Controlled stacking of van der Waals materials is a powerful tool for exploring the physics of quantum condensed matter. Given the small binding between layers, exploitation for engineering will require a breakthrough in stacking methodology or an ability to take advantage of thicker defective stacks. Here, we describe computational groundwork for the latter, using—on account of its promise for cold memory applications—1T-TaS2 as a model system. Comparing recursive Hendricks-Teller calculations and Monte Ca

The engineering of aluminum nitride (AlN) waveguides allows for broad supercontinuum generation (SCG) within its wide transparency window (200 nm - 5.5 μm) enabling applications in precision spectroscopy and metrology fields. An efficient coverage from 500 to 3500 nm was shown by pumping crystalline AlN waveguides with a femtosecond laser centered at 1560 nm [1]. UV and visible coverage was reached by pumping around 800 nm and by chirping the waveguide [2] or by exploiting the modal dispersion of higher-ord

Controlled stacking of van der Waals materials is a powerful tool for exploring the physics of quantum condensed matter. Given the small binding between layers, exploitation for engineering will require a breakthrough in stacking methodology, or an ability to take advantage of thicker defective stacks. Here we describe computational groundwork for the latter, using -- on account of its promise for cold memory applications -- 1

T

-TaS

_2

as a model system. Comparing recursive Hendricks-Teller calculations a

An alternative method based on time reversal to locate solid faults in transmission line networks was recently proposed by Codino et al. in the paper “An alternative method for locating faults in transmission line networks based on time reversal” (IEEE Tra ...

Mechanically coupled resonators have been applied in the last years to the development of nanomechanical mass-sensors based on the detection of the different vibration modes of the system by measuring on a single resonator. Their sensitivity and capability ...

This paper presents two W-band waveguide bandpass filters, one fabricated using laser micromachining and the other 3-D printing. Both filters are based on coupled resonators and are designed to have a Chebyshev response. The first filter is for laser micro ...

Typical optimal controls of power systems, such as scheduling of generators, voltage control, losses reduction, have been so far commonly investigated in the domain of high-voltage transmission networks. However, during the past years, the increased connection of distributed energy resources (DERs) in power distribution systems results in frequent violations of operational constraints in these networks and has raised the importance of developing optimal control strategies specifically applied to these syste

We present the successful operation of the first dielectric elastomer actuator (DEA) driven tunable millimeter-wave phase shifter. The development of dynamically reconfigurable microwave/millimeter-wave (MW/MMW) antenna devices is becoming a prime need in the field of telecommunications and sensing. The real time updating of antenna characteristics such as coverage or operation frequency is particularly desired. However, in many circumstances currently available technologies suffer from high EM losses, incr

We present a proof of principle for a new imaging technique combining leakage radiation microscopy with high-resolution interference microscopy. By using oil immersion optics it is demonstrated that amplitude and phase can be retrieved from optical fields, which are evanescent in air. This technique is illustratively applied for mapping a surface mode propagating onto a planar dielectric multilayer on a thin glass substrate. The surface mode propagation constant estimated after Fourier transformation of the

A germanium (Ge) strip waveguide on a silicon (Si) substrate is integrated with a microfluidic chip to detect cocaine in tetrachloroethylene (PCE) solutions. In the evanescent field of the waveguide, cocaine absorbs the light near 5.8 mm, which is emitted from a quantum cascade laser. This device is ideal for (bio-)chemical sensing applications.

RF microelectromechanical systems (MEMS) capacitive switches for two different dielectrics, aluminum nitride (AlN) and silicon nitride (Si3N4), are presented. The switches have been characterized and compared in terms of DC and RF performance (5-40 GHz). Switches based on AlN have higher down-state capacitance for similar dielectric thicknesses and provide better isolation and smaller insertion losses compared to Si3N4 switches. Experiments were carried out on RF MEMS switches with stiffening bars to preven

Basic wave-particle interaction dynamics from linear to chaotic regimes is experimentally studied on a frequency tunable gyrotron generating THz radiation in continuous mode (200W) at 263GHz which will be used for dynamic nuclear polarization nuclear magnetic resonance spectroscopy applications. In the studied system, the nonlinear dynamics associated to the waveparticle interaction is dominated by longitudinal mode competition of a given transverse TEm;p cavity-mode. This study covers a wide range of contr

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Transition from Near-Field to TEM Propagation in Lightning-Struck Shield Wires and Its Impact on Induced Voltages

Interlayer stacking controls the electronic properties of the van der Waals material 1T-TaS2

Extending the Supercontinuum Spectrum in Fully Etched Thick Aluminum Nitride Waveguides

Effect of Interlayer Stacking on the Electronic Properties of 1$T$-TaS$_2$

Extension of the Unmatched-Media Time Reversal Method to Locate Soft Faults in Transmission Lines

Asymmetrically coupled resonators for mass sensing

W-Band Waveguide Filters Fabricated by Laser Micromachining and 3-D Printing

Optimal voltage control processes in active distribution networks

A tunable millimeter-wave phase shifter driven by dielectric elastomer actuators

Leakage radiation interference microscopy

Cocaine detection by a mid-infrared waveguide integrated with a microfluidic chip

RF MEMS Shunt Capacitive Switches Using AlN Compared to Si3N4 Dielectric

Experimental study from linear to chaotic regimes on a terahertz-frequency gyrotron oscillator