This note is concerned with a new controller design problem for networked systems random communication delays. Two kinds of delays are simultaneously considered: i) from the to plant, and ii) sensor controller, via limited bandwidth channel. The modeled as linear function stochastic variable satisfying Bernoulli binary distribution. observer-based designed exponentially stabilize system in sense mean square, also achieve prescribed H/sub /spl infin// disturbance attenuation level. addressed...

In this paper, a robust finite-horizon Kalman filter is designed for discrete time-varying uncertain systems with both additive and multiplicative noises. The system under consideration subject to deterministic stochastic uncertainties. Sufficient conditions the guarantee an optimized upper bound on state estimation error variance admissible uncertainties are established in terms of two Riccati difference equations. A numerical example given show applicability presented method.

Demand for rapid and massive-scale exfoliation of bulky graphite remains high in graphene commercialization property manipulation. We report a procedure utilizing "preformed acidic oxidizing medium (PAOM)" as modified version the Hummers' method fast reliable synthesis oxide. Pre-mixing KMnO4 concentrated H2SO4 prior to addition flakes enables formation effectively efficiently oxidized oxide (EEGO) featured by its yields suspension homogeneity. PAOM expedites diffusion Mn-oxidants into...

We demonstrate a cascaded Mach-Zehnder interferometer (MZI) based coarse wavelength division multiplexing (CWDM) (de)multiplexer on silicon-on-insulator with its spectral responses well aligned to the defined grids and are highly tolerant manufacturing linewidth variability. This was achieved by optimizing waveguide widths lengths of two arms in every MZI. As-realized CWDM exhibits shift 0.487 nm, an insertion loss less than 2.1 dB, channel crosstalk lower -20 while reference devices...

The aim of this paper is to study the pole-zero cancellations which occur in a class $H^\infty $-optimal control problems may be embedded configuration Fig. 1. $ are said first kind if both $P_{12} (s)$ and $P_{21} square but not necessarily same size. It primarily will concern us here. A general bound on McMillan degree all controllers stabilizing lead closed loop satisfies $\| {{\bf \mathcal{R}}(s)} \|_\infty \leqq \rho ($\rho need optimal $L^\infty $-norm sense) derived. As illustrated 1,...

Tapered silicon photonic crystals (PhCs) with smooth sidewalls are realized using a novel single-step deep reactive ion etching. The PhCs can significantly reduce the surface reflection over wavelength range between ultra-violet and near-infrared regions. From measurements spectrophotometer an angle-variable spectroscopic ellipsometer, sub-wavelength periodic structure provide broad angular-independent antireflective window in visible region for TE-polarized light. tapered rods further due...

Silicon antireflection is realized with vertical-aligned SiNWs by using improved metal-induced etching technique. The spectral responses of the transmission, reflection, and absorption characteristics for different lengths are investigated. In order to realize short provide sufficiently low a post chemical process developed make nanowires have larger length fluctuation and/or tapered structure. use can allow faster time avoid sub-bandgap that frequently occurs in long nanowires. Short also...

A novel and simple approach is demonstrated for fabricating silicon nanowire arrays (SNWAs) with controllable sidewall profiles. single-step deep-reactive-ion etching (SDRIE) used to transfer the holography patterned photoresist template or silicon-on-insulator substrates. With SDRIE process, scalloping of sidewalls can be avoided while reserving high-mask selectivity over resist high-etching rate. The angle resultant patterns adjusted by tuning composition gas mixture process....

This work proposes a tunable reflective guided-mode resonant (GMR) filter that incorporates 90° twisted nematic liquid crystal (TNLC). The GMR grating acts as an optical resonator reflects strongly at the resonance wavelength and alignment layer for LC. TNLC functions achromic polarization rotator alters of incident light. reflectance such can be controlled by setting angle incidence driving TNLC, respectively. designed exhibits very large spectral shift in from 710 to 430 nm, which covers...

In this work, for the first time, to best of our knowledge, an anomalous dispersion CMOS-compatible Ta2O5 waveguide was realized, and broadband on-chip supercontinuum generation (SCG) accordingly demonstrated. When pumped at a center wavelength 1056 nm with pulses 100 fs duration peak power 396 W, ranging from 585 1697 generated, comprising bandwidth more than 1.5 octaves leading efficient SCG source. The excellent performance generate benefits mainly its high nonlinear refractive index,...

This paper deals with the robust mixed H/sub 2//H/sub /spl infin// filtering problem regional pole assignment for linear uncertain discrete-time systems in presence of two sets exogenous disturbance inputs. A general framework solving this is established using a matrix inequality (LMI) approach conjunction constraints, and 2/ optimization characterization. Necessary sufficient conditions solvability are given terms set feasible LMIs. numerical example provided to illustrate effectiveness...

We report a 2×2 broadband and fabrication tolerant mode-evolution-based 3 dB coupler based on silicon-on-insulator rib waveguides. The operating principle of the is adiabatic evolution local eigenmodes. key element device an adiabatically tapered mode region, which converts two dissimilar waveguides into identical Contrary to conventional designs using linear taper function where adiabaticity uneven during evolution, we use fast quasiadiabatic approach homogenize device, leading shortcut...

Interferometric fiber optic gyroscope (IFOG) is advantageous for inertial navigation due to its high reliability as a solid-state technology with no moving parts. The size, weight, power, and cost of IFOG can be improved by employing photonic integration technology. Here, leveraging the foundry-enabled silicon photonics platform, we demonstrate multi-function integrated optical circuit (Si-MIOC) fingertip size that easily interfaces light source coil perform tactical-grade (0.1 <sup...

The mixed H/sub 2//H/sub /spl infin// filtering problem for uncertain linear continuous-time systems with regional pole assignment is considered. purpose of the to design an uncertainty-independent filter such that, all admissible parameter uncertainties, following requirements are simultaneously satisfied: 1) process asymptotically stable; 2) poles matrix located inside a prescribed region that compasses vertical strips, horizontal disks, or conic sectors; 3) both 2/ norm and on respective...

Uniform periodic structure formation over a large sample area has been challenging in laser interference lithography (LIL) mainly due to the Gaussian intensity distribution inherent beam. In this work, refractive beam shaping devices are applied Lloyd's interferometer create flat-top light field (2.8% variation an of 20 × cm2) for wafer-scale nanopatterning. Around 10−2 fill factors obtained all reported one dimensional and two structures across 2-in. wafer, which is 1 order magnitude lower...

In this work, we demonstrate a novel <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.52</sub> Al xmlns:xlink="http://www.w3.org/1999/xlink">0.48</sub> As based top-illuminated avalanche photodiode (APD), designed to circumvent the problem of serious bandwidth degradation under high gain (>100) and power operation significantly enhance dynamic range in established frequency modulated continuous wave (FMCW) lidar system. our APD design, carriers...

The problem of depth-from-motion using a monocular image sequence is considered. A pixel-based model developed for direct depth estimation within Kalman filtering framework. method proposed incorporating local surface structure into the filter. Experimental results are provided to illustrate effect structural information on estimation.

In this paper we consider the admissible inertias and ranks of expressions $A-BXB^*-CYC^*$ $A-BXC^*\pm CX^*B^*$ with unknowns X Y in four cases when these are: (i) complex self-adjoint, (ii) skew-adjoint, (iii) real symmetric, (iv) skew symmetric. We also provide a construction for to achieve desired inertia/rank that uses only unitary/orthogonal transformation, thus leading numerically reliable construction. addition, look at related block matrix completion problems...

We demonstrate broadband comb-line generation from an integrated multiple quantum well InGaAsP/InP passively mode-locked laser (MLL) with a gain flattening filter (GFF) based on asymmetric Mach-Zehnder interferometer. The intracavity flattens the nonuniform profile of semiconductor material providing more uniform net cavity gain. GFF MLL has -10 dB comb span 15 nm (1.88 THz), widest spectral width yet demonstrated for QW at 1.55 μm . measured optical linewidth center is 29 MHz, -20 RF 500...