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Due to limitations in device speed and performance of silicon-based electronics, silicon optoelectronics has been extensively studied to achieve ultrafast optical-data processing. However, the biggest challenge has been to develop an efficient silicon-based light source since indirect band-gap of silicon gives rise to extremely low emission efficiency. Although light emission in quantum-confined silicon...
• CMOS compatible silicon photonics combines two great inventions: — The transistor → microprocessor — The laser → optical communications and enable >100x lower power and lower power density. • A suite of hybrid silicon devices demonstrated — Fabry Perot, DFB, Ring and Mode Locked Lasers — Optical amplifiers and integrated preamplifier arrays — 50 Gbps modulators demonstrated • Low cost, high volume...
We have fabricated Sb2Te3 thin films, with different thicknesses by controlling the deposition times, using pulsed laser deposition. We studied the dielectric properties using terahertz time domain spectroscopy (TDS). The real and imaginary parts of the complex refractive index of Sb2Te3 thin films were presented.
Method of computer diagnosing is proposed by using the cluster analysis that allowed formalizing the complex processes of the identification and preventing the emergency conditions of quasi-stationary control objects. The method creates a possibility of the real time diagnosis and differentiation of diagnosed conditions as well as accounting the sliding correlation characteristics.
The control of electromagnetic waves at terahertz frequencies is possible with bulky or voluminous structures like planar antennas with Silicon lenses or classical horn antennas. In this work, we present the development of Metasurfaces in order to achieve flat or low profile devices such as flat lenses with V-shape cells and also antennas with corrugations. The lenses, with a single or a multilayer...
We report on simulation results that shows optimum photon absorption by superconducting nanowires can happen at a fill-factor that is much less than 100%. We also present experimental results on high performance of our superconducting nanowire single photon detectors realized using NbTiN on oxidized silicon.
Monolithic integration of photonic devices with electronics has attracted interest and there has been growing interest in photonic devices based on Si-compatible materials. Ge has a bandgap of 0.67 eV at room temperature and high absorption coefficient in the range of 1.3 – 1.55 µm. Furthermore, when biaxial tensile stress is applied to Ge, it transforms from an indirect to a direct bandgap material...
The Effect of silicon window polarity on partial-SOI (partial silicon-on-insulator, PSOI) LDMOS power devices under high-voltage operation is studied. Different polarities of the silicon window in PSOI LDMOSFETs are analyzed to investigate their effects on electrical characteristics: breakdown voltage (BV) and on-resistance (Ron). In partial-SOI LDMOSFETs, the P-type silicon window is considered as...
This paper presents a method for spotting chief speaker from press conference recordings where durations of silence segment in one utterance of chief speaker and other speakers are obviously different. In the proposed method, speech endpoint detection is first performed on the audio conference recordings for obtaining the durations of silence segment (i.e. Si sequence). Then, Si sequence is converted...
A set of laboratory activities has been developed to simulate multiple steps in the integrated circuit fabrication process. The Microfabrication Teaching Laboratory offers tools and procedures for a comprehensive simulation of the device fabrication process, with the goal of producing working devices such as a p-n diode, a solar cell and a MOSFET on a silicon wafer substrate. The lab includes activities...
Despite theoretical arguments for distinguishing between novice and serial entrepreneurs, empirical evidence on their differences remains inconclusive. This paper extends existing research, using a unique dataset of primarily immigrant Silicon Valley entrepreneurs. It finds that serial entrepreneurs displayed higher aspirations, embedded and diverse social networks, reliance on collaborators, access...
Due to the advancement of technology, the phenomenon of using digital teaching materials during the process of learning has spread among various subjects. The aim of this study is to understand the fundamental factors influencing students' acceptance of applying digital recording technology to prepare and present research papers in college courses. Sixty-nine questionnaires were distributed and sixty-seven...
Consider a network where an unidentified source starts a rumor. The rumor spreads along the edges of the network to other nodes in the network. After a sufficiently long amount of time, we observe a subset of the nodes that have heard the rumor, and using this information wish to identify the source. Optimal estimators were recently proposed for regular (exponential growth) and irregular geometric...
The differential quadrature method (DQM) can obtain a well approximation in solving the linear problems in engineering, and high precision can be achieved even for computing the nonlinear problems. Flexible sensor is based on the structure of flexible electronics, and the higher-order nonlinear mechanical equation in the structure of flexible sensor can be solved by the DQM. This paper validates the...
Ubiquitous learning technologies will play a key role in smart learning cities. However, despite the hype, the degree of adoption of ubiquitous learning systems, even in controlled academic environments, has perhaps not reached its full potential. Consequently, there is a need to understand the adoption behavior of key stakeholders. This paper presents a first step in this direction by asking researchers...
Talent aggregation in a particular region — as a result of talent flow — plays a significant role in promoting regional advantages. For developing countries, it is a gradual process to bring the regional advantage of late-development (RAL) into full play through enhancing regional talent competitiveness (RTC). Based on a case study of Dalian High-tech Zone, China, this study elaborates upon the coevolution...
People are already familiar with stories about innovation in Silicon Valley. It presents a specialized innovation mode, which is based on universities of science and technology. However, people pay little attention to another high-tech innovation center-New York. This paper points out that unlike Silicon Valley which has strong science and technology universities like Stanford and Berkeley, New York...
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