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Underwater UV laser pulse propagation experiments were performed at intensities spanning the linear and nonlinear regimes. Measurements and simulations show strong coupling to molecular Raman modes and suggest strong ionization-induced refraction near the beam focus.
Chiral metamirrors can reflect one circularly polarized light without changing its handedness, while almost completely absorb the other, which would have many potential applications in engineering. In this paper, recent progresses of our group on the chiral metamirrors are reviewed. Firstly, we discuss the general method to design the chiral metamirrors under the framework of Jones calculus. The structural...
In this paper, we propose an efficient test flow for Cell-Aware Test (CAT) to drastically reduce the time for CAT-enhanced test generation at the cell level. In CAT, the detail transistor-level circuit simulation is used to find appropriate test patterns and it has been considered as very time consuming. To solve this problem, first, we exploit Switch-Level ATPG (SL-ATPG) and experimentally show that...
Consider a setting where robots must visit sites represented as nodes in a graph, but each robot may fail when traversing an edge. The goal is to find a set of paths for a team of robots which maximizes the expected number of nodes collectively visited, while guaranteeing that the paths satisfy a notion of “independence” formalized by a matroid (e.g. limits on team size, number of visits to regions),...
In this paper, a dual-frequency permafrost active layer thickness (ALT) retrieval algorithm is presented wherein P-band AirMOSS and L-band UAVSAR data are used to retrieve the layered soil dielectric constants and layer thicknesses. Using the known radar calibration accuracy, radar sensing depth is defined to help understand the limit of radar backscatter sensitivity to subsurface soil conditions...
A remarkable feature about the temporal optical soliton is that it can be phase-matched to new frequencies, emitting so-called resonant radiation (RR). This constitutes an efficient source of ultrafast pulses in emerging wavelength regimes, and plays a vital role in coherently extending the supercontinuum bandwidth [1]. RR waves are usually invoked by four-wave mixing (4WM) through the self-phase...
With decreasing generation of central conventional power plants and increasing number of decentral renewable energy sources (RES), there is arising discussion on distribution grids providing flexibility in terms of control of active and reactive power exchange at connection points to higher voltage grids by control of RES. In this work, a new methodology is developed to estimate flexibility potential...
This paper firstly presents an integrated three-axis electrochemical micro seismic sensor, which consists of four sensing units. The direction of the flow is opposite in different channel so that differential current can be calculated. Vertical vibration can also be detected by the addition of the output from four sensing units. Instead of huge volume in conventional three-axis sensor, the integrated...
The assessment of deep traps in In0.3Ga0.7As nFinFETs by Generation-Recombination (GR) noise spectroscopy is described in this paper. The gate voltage dependence of the corner frequency is studied for several devices with different gate lengths. Both gate-voltage-independent and gate-voltage-dependent corner frequencies are found. It is shown that the noise type turns from GR to Random Telegraph Signal...
We demonstrate amplification in a multimode cladding-pumped fiber amplifier supporting 36 spatial modes. Using a large core EDF, we obtain <0.5dB differential modal gain, 16dB gain, and 25dBm output power across the C-band.
Implementation of thick Cu inductor in IC chips has been a highly challenging task for Far-backend packaging industry. One of the major concerns is that the thicker Cu trace wrapped by re-passivation polymer layers (Polymer-1 & Polymer-2) is often accompanied by remarkable internal stress in the overall package, which is plagued with the risk of layer-to-layer delamination and/or interface micro-cracks...
Polymer film is general used for stress buffer and dielectric film for Wafer Level Chip Scale Package (WLCSP). Chemical resistance and mechanical resistance of polymer films usually get worse after several processes with chemicals or heat. Weak chemical or mechanical resistance will induce polymer film cracking. Polymer cracking further induces humidity penetration into RDL (Re-distribution Layer)...
This study addresses on the characteristics of electrolyte-insulator-semiconductor (EIS) sensors with the nanoscale patterns fabricated by nano imprint lithography (NIL). The proposed sensors with the nanoscale patterns, such as square and line, exhibited higher sensitivity and lower hysteresis than that with the conventional ones. For the proposed sensors, with the high surface-volume ratio of the...
Experimental results about tests on a commercial power bricks under radiations is presented. The experimental obtained results are very interesting in order to evaluate the possibility to use particular electronic device, which can be used in harsh environment. The power bricks tested in this paper highlights interesting technical specification.
Laser grooving process is crucial to thin chip strength. Much of paper has been put on the mechanism of laser grooving, but only few investigations were taken for chip strength enhancement. In this paper, thin chip (less than 100um chip thickness) is adopted, and the experiment of laser grooving process is carried out for mechanical characteristics evaluation. Based on experiment results, the optimal...
As chip makers move to advanced nodes and device geometries shrink, design and production costs have risen rapidly. As a result, it has become increasingly critical to reduce costs in established technology nodes by increasing device yield. For a given process, differences in individual process chambers can lead to process variations that may have a large impact on both overlay control and yield management...
An inline intermodal no core fiber (NCF) sensor based on direct ligand immobilization for detection of nickel ions (Ni2+) is proposed. Covalently immobilized nickel specific ligand, Meso-Tetra(4-carboxyphenyl)porphine, on the NCF surface serves as adsorption site for Ni2+ and can induce ambient refractive index (RI) change around the NCF on occurrence of binding events. The change in RI results in...
The rotary type electromagnetic actuator is often used in the electromagnetic mechanical components design such as RF switch, signal electromagnetic relay, etc. Technical index of this type of actuator focus on high requirements for conversion speed, action frequency, signal reliability and the minimum volume under certain power. In this paper, a new type of rotary electromagnetic actuator with permanent...
Ferroelectric HfZrOx (FE-HZO) negative capacitance (NC) FETs is experimentally demonstrated with physical thickness 1.5 nm after annealing 800°C for subthreshold swing (SS) < 60 mV/dec and hysteresis free. The relation between SS and FE-HZO thickness is also discussed. The NC-FinFET modeling is validated on standard 14nm FinFET. The feasible concept of coupling the polarization Hf-based oxide was...
Latchup (LU) had been considered to be less important in advanced CMOS technologies. However, I/O interface and analog applications can still operate at high voltage (e.g., 1.8V or 3.3V) in sub-20nm bulk FinFET technologies. LU threats are never eliminated and the sensitivity towards LU is increased in bulk FinFET technology.
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