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An on-chip refractive index (RI) sensor with high sensitivity and large measurement range is demonstrated. The sensing scheme presented here is based on Mach-Zehnder interferometer configuration built on an SOI wafer. The measured wavelength sensitivity reaches 3498.6 nm/RIU (TE-mode). Meanwhile, according to the period changes of interference patterns, the measured period sensitivities are 20.4 nm/RIU...
This paper presents the comparative design of a CMOS cross-coupled oscillator in class-B and Class-C topology, respectively using film bulk acoustic resonator (FBAR) in order to improve the phase noise and power consumption. The design issues such as low frequency stability, phase noise issues and optimization method of FBAR on a CMOS wafer will will be discussed. Experiment results and performance...
We demonstrated an InAsP/InP nanowire laser (diameter ∼100 nm) in telecommunication band on an Si photonic crystal platform. By measuring light-in versus light-out curves, linewidth, emission rate, and photon correlation, lasing oscillation has been unambiguously demonstrated.
This paper designed a kind of dual-circular polarized antenna based on substrate integrated waveguide structure (SIW). This antenna contains a SIW-CPW coupler and two resonant slot antennas. The coupler uses SIW as the radiation portion while coplanar waveguide (CPW) is the input matching portion that is connected directly to the active circuits, and each resonant slot antenna has six −45° or 45°...
A mechanical parameter estimation algorithm for permanent magnet synchronous motor (PMSM) drive system basing on sliding mode observer is proposed in this paper. First, an extended sliding mode mechanical parameter observer (ESMMPO) is presented to track system disturbances in real time. Based on this ESMMPO, a simple algorithm for mechanical parameter estimation of the PMSM control system is presented...
A compact efficient dual-wavelength eye-safe Nd:YAP Raman laser at 1478 and 1503 nm is originally demonstrated based on simultaneous excitations of the cascaded 267-cm−1 mode and the 694-cm−1 shift in the KTP crystal.
Continuous separation of nano-sized molecules has great importance in biomedical applications. This paper represents a near-field optical approach to separate nanoparticles using speckle patterns. Near-field random light patterns (speckle pattern) are generated by the repeated coupling and interference of light in nano-waveguide arrays. The movements of 2-µm and 0.5-µm particles are studied under...
An atomisitic etching model is combined with a continuum concentration solver in order to realistically simulate various effects during Deep Reactive Ion Etching (DRIE or the Bosch process). This includes microloading (or loading effect) and Aspect Ratio Dependent Etching (ARDE or lag effect). The model strongly differs from the current simulation approaches in which the local etch rate depends markedly...
The effect of mutual coupling in the modeling of an 8×8 microstrip patch array antenna is presented. The antenna is modeled using embedded individual element patterns, and embedded 4-element image patterns to examine the effects of mutual coupling on the array performance. The measurement results validate the accuracy of the simulation results.
The super-fast growth in recording areal density and the correlative decrease of the exterior dimension has been greatly beneficial to the widespread use of hard disk drives (HDDs). In the pursuit of high areal recording density, the heat assisted magnetic recording (HAMR) has been promised to be a new and feasible technology for the next generation of HDDs [1]. In this paper, the temperature distribution...
Adhesive materials are the key component in the whole temporary bonding/debonding process for thin wafer handling. In this study, a reversible thermoset was synthesized by polycondensation between methyl diamine and aldehydes and was used as the basic resin for temporary adhesive. The use of thermoset endows the adhesive with excellent thermal and chemical stabilities. Moreover, the thermoset can...
As the main source of ship propulsion motor, reduce the vibration noise is of great significance for improving the acoustic stealth performance of ships. Establish motor feet vibration transfer path analysis model to determine the primary excitation source and transfer path; Hammering method is used to test the transfer function of the path, and collect the response of reference point and target point...
For electric vehicles and hybrid electric vehicles applications, the stator permanent-magnet flux-switching (SPM-FS) machines have attracted considerable attentions due to the benefits of high power density and improved reliability[1]. However, due to the existence of magnets on the stator, the slot areas for the armature windings are significantly reduced, leading to an increased copper loss and...
NdFeB magnets have a wide range of applications in various electronic devices and driving motors [1]. Anisotropic NdFeB magnets are more attractive for their ability to provide high energy product and high heat resistant [2]. One approach to fabricate anisotropic nanocrystalline NdFeB magnets is hot press and hot-deformation of quenched ribbons [3, 4]. This traditional way, however, will lead to excessive...
Diamond-like carbon (DLC) films which contain a mixture of sp2 and sp3 hybridizations are widely used as a protective layer against wear and corrosion in hard disk drives (HDDs) due to their outstanding mechanical and tribological properties such as high hardness, low friction coefficient and excellent chemical durability [1]. The typical thickness of DLC film in HDD is approximately 1-2nm. For such...
Nowadays, the hard disk drive (HDD) filling with helium have emerged to achieve highly stable magnetic recording. The bearing force in helium is different from that in air. This paper uses the three-dimensional (3D) direct simulation Monte Carlo (DSMC) method to investigate the bearing force over bit patterned media (BPM) in the filling gases of air and helium under different conditions, including...
This is an experimental study on effectively decomposing volatile organic waste by atmospheric-pressure microwave plasma. P-Xylene (PX) was used as a sample agent in the experiment because it is the main volatile organic compound (VOC) exhaust waste produced in many chemical industries and difficult to eliminate completely. We developed a microwave plasma apparatus1 which was designed for research...
This paper presents a novel wearable single-channel electrooculography (EOG) based human-computer interface (HCI) with a simple system design and robust performance. In the proposed system, EOG signals for control are generated from double eye blinks, collected by a commercial wearable device (the NeuroSky MindWave headset), and then converted into a sequence of commands that can control cursor navigations...
Wideband distributed coherent aperture radar has become the most significant direction in next generation radar. Its high range resolution due to wideband and high angle resolution because of distributed aperture can accurately estimate the target's range and angle. In result, tracking and identification can be employed. However, single radar cannot detect the long-range target because of its relatively...
Electromechanical converters (EMCs) are considered to be the most frequently employed linear motion mechanism in various industry fields. This study tries to improve the magnetic force characteristics of an EMC, focusing on the key component, permanent magnet (PM) of the EMC, different magnetization techniques of single PM and different magnetization array of multiple PMs are compared. and a novel...
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