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European Conference on Optical Communication (ECOC)

作者： Qiang Li Qingjiang Chang Fangfei Liu Ziyang Zhang Min Qiu Yikai Su State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiaotong University Shanghai China Department of Microelectronics and Applied Physics Royal Institute of Technology Kista Sweden

We demonstrate a microwave-photonic phase shifter based on a 20-mum-radius silicon micro-ring resonator, providing a tunable phase shift for a 20-GHz signal in a range of 0 - -4.6 rad.

关键词： Optical resonators Phase shifters Silicon Optical ring resonators Resonance Nonlinear optics Optical signal processing Optical attenuators Fiber nonlinear optics Optical scattering

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Optical signal processing in silicon nano-waveguides

Optical signal processing in silicon nano-waveguides

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OptoElectronics and Communications Conference, OECC

作者： Yikai Su Qiang Li Fangfei Liu Ziyang Zhang Min Qiu State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiaotong University Shanghai China Department of Microelectronics and Applied Physics Royal Institute of Technology Kista Sweden

All-optical tunable delay, dense wavelength conversion, and non return-to-zero (NRZ) to alternate-mark-inversion (AMI) format conversion are experimentally demonstrated using silicon microrings with a 450 times 250 nm... 详细信息

关键词： Silicon Delay Optical signal processing Optical wavelength conversion Optical ring resonators Optical waveguides Optical filters

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Modeling and simulation for on-chip power grid networks by locally dominant Krylov subspace method 08

Modeling and simulation for on-chip power grid networks by l...

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IEEE International Conference on Computer-Aided Design

作者： Boyuan Yan Sheldon X.-D. Tan Gengsheng Chen Lifeng Wu Department of Electrical Engineering University of California Riverside CA USA ASIC & System State-Key-Lab MicroElectronics Department Fudan University Shanghai China Cadence Design Systems Inc. San Jose CA USA

ISBN: (纸本)9781424428205

Fast analysis of power grid networks has been a challenging problem for many years. The huge size renders circuit simulation inefficient and the large number of inputs further limits the application of existing Krylov-subspace macromodeling algorithms. However, strong locality has been observed that two nodes geometrically far have very small electrical impact on each other because of the exponential attenuation. However, no systematic approaches have been proposed to exploit such locality. In this paper, we propose a novel modeling and simulation scheme, which can automatically identify the dominant inputs for a given observed node in a power grid network. This enables us to build extremely compact models by projecting the system onto the locally dominant Krylov subspace corresponding to those dominant inputs only. The resulting simulation can be very fast with the compact models if we only need to view the responses of a few nodes under many different inputs. Experimental results show that the proposed method can have at least 100X speedup over SPICE-like simulations on a number of large power grid networks up to 1 M nodes.

关键词： Network-on-a-chip Power grids Power system modeling Transfer functions Attenuation Filters System-on-a-chip Application specific integrated circuits microelectronics Circuit analysis

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Label-free Biosensor Based on Silicon-On-Insulator Concentric Micro-Ring Resonators

Label-free Biosensor Based on Silicon-On-Insulator Concentri...

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IEEE PhotonicsGlobal@Singapore, IPGC

作者： Xiaohui Li Yikai Su Ziyang Zhang Min Qiu Shengying Qin State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiaotong University Shanghai China Department of Microelectronics and Applied Physics Royal Institute of Technology Kista Sweden Bio-X Life Science Research Center Shanghai Jiaotong University Shanghai China

We propose a label-free biosensor based on concentric micro-ring resonators in silicon on insulator (SOI). The concentric micro-ring resonators offer another freedom to obtain deeper notches for higher detection sensitivity. The expanded modes also provide larger sensing area. A resonant frequency shift of ~1.37 nm is demonstrated, by numerical simulations, between the situation of using a single strand DNA and a double strand DNA.

关键词： Biosensors Silicon on insulator technology Optical resonators Resonance Mutual coupling Resonant frequency DNA Coupling circuits Q factor Optical fiber communication

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Femtosecond Third-Order Optical Nonlinearity of Au:Bi2O3 Nanocomposite Films

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中国物理快报（英文版） 2007年第3期24卷 730-733页

作者： YOU Guan-Jun ZHOU Peng DONG Zhi-Wei ZHANG Chun-Feng CHEN Liang-Yao QIAN Shi-Xiong Department of Physics Fudan University Shanghai 200433 State Key Lab for Surface Physics Fudan University Shanghai 200433 School of Microelectronics State Key Lab of ASIC and Systems Fudan University Shanghai 200433 Department of Optical Science and Engineering Fudan University Shanghai 200433 Department of Physics Fudan University Shanghai 200433

Ultrafast third-order optical nonlinearities of the as-deposited and annealed Au:Bi2O3 nanocomposite films de posited by magnetron cosputtering are investigated by using femtosecond time-resolved optical Kerr effect (OKE)and pump-probe techniques. The third-order optical nonlinear susceptibility is estimated to be 2.6 × 10-10 esu and 1.8 × 10-9 esu at wavelength of 800nm, for the as-deposited and the annealed film, respectively. The OKE signal of the as-deposited film is nearly temporally symmetrical with a peak centred at zero delay time, which indicates the dominant contribution from intraband transition of conduction electrons. For the annealed film, the existence of a decay process in OKE signal implies the important contribution of hot electrons. These characteristics are in agreement with the hot electron dynamics observed in pump-probe measurement.

关键词： COMPOSITE THIN-FILMS METAL COLLOIDS NANOPARTICLES ABSORPTION FIBER GOLD DYNAMICS SIZE

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Micro-scale lowpass filters based on the Maxwell-Wagner phenomenon

Micro-scale lowpass filters based on the Maxwell-Wagner phen...

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European Conference on Microwave

作者： Themistoklis Prodromakis Christos Papavassiliou George Konstantinidis Circuits and Systems Group Department of Electrical and Electronic Engineering Imperial College London UK Microelectronics Research Group IESL FORTH Heraklion Greece

This paper presents a novel approach for designing miniaturized distributed lowpass filters. We propose to utilize microstrip transmission lines based on multilayer substrates which support slow-electromagnetic propagation. Based on such substrates, very compact LPFs are presented with cut-off frequencies in the low GHz region, with the measured insertion loss varying from 0.5-1.7 dB and with a return loss better than 7 dB from 100 MHz-2 GHz.

关键词： Filters Dielectric substrates CMOS technology Frequency Silicon on insulator technology Dielectric loss measurement Polarization circuits Dielectric constant Ferroelectric materials

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A Miniaturized Delay Line based on Slow-Wave Substrates

A Miniaturized Delay Line based on Slow-Wave Substrates

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IEEE International Symposium on circuits and systems (ISCAS)

作者： Themistoklis Prodromakis Christos Papavassiliou George Konstantinidis Circuits and Systems Group Department of Electrical and Electronic Engineering Imperial College London London UK Microelectronics Research Group IESL FORTH Heraklion Greece

The paper proposed miniaturized delay lines on layered synthetic substrate materials which support slow-electromagnetic propagation. Under certain conditions such substrates mimic materials with ultra-high electric permittivity. The proposed structure is easily fabricated and a miniaturization factor of two orders of magnitude is reported. Theoretical and experimental results are in good agreement.

关键词： Delay lines Dielectric substrates Permittivity Phased arrays Microwave propagation Dielectric constant Dielectric losses Clocks CMOS technology Microstrip

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Femtosecond Third-Order Optical Nonlinearity of Au：Bi203 Nanocomposite Films

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Chinese Physics Letters 2007年第3期24卷 730-733页

作者：游冠军周鹏董志伟张春峰陈良尧钱士雄 Department of Physics Fudan University Shanghai 200433 State Key Lab for Surface Physics Fudan University Shanghai 200433 School of Microelectronics State Key Lab of ASIC and Systems Fudan University Shanghai 200433 Department of Optical Science and Engineering Fudan University Shanghai 200433

Ultrafast third-order optical nonlinearities of the as-deposited and annealed Au：Bi2O3 nanocomposite films deposited by magnetron cosputtering are investigated by using femtosecond time-resolved optical Kerr effect （OKE） and pump probe techniques. The third-order optical nonlinear susceptibility is estimated to be 2.6Ф×10^- 10 esu and 1.8 × 10.9 esu at wavelength of 800nm, for the as-deposited and the annealed film, respectively. The OKE signal of the as-deposited film is nearly temporally symmetrical with a peak centred at zero delay time, which indicates the dominant contribution from intraband transition of conduction electrons. For the annealed film, the existence of a decay process in OKE signal implies the important contribution of hot electrons. These characteristics are in agreement with the hot electron dynamics observed in pump probe measurement.

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Interface trap model for the low-dose-rate effect in bipolar devices

Interface trap model for the low-dose-rate effect in bipolar...

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European Conference on Radiation and its Effects on Components and systems (RADECS)

作者： V.S. Pershenkov K.A. Chumakov A.Y. Nikiforov A.I. Chumakov V.N. Ulimov A.A. Romanenko Department of Microelectronics of Moscow Engineering Physics Institute Russia Moscow State Engineering and Physics Institute Moscow Russia Specialized Electronic Systems Moscow Russia Research Institute of Scientific Instruments Moscow Russia

It is shown that the gain degradation of NPN and PNP bipolar transistors at low-dose-rate irradiation basically connects with radiation-induced interface traps build-up. The test for simulating low-dose-rate effect is... 详细信息

ISBN: (纸本)9781424417049

关键词： Degradation Bipolar transistors Spontaneous emission Testing Temperature measurement Electron traps Lead compounds Physics Instruments MOSFETs

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Analysis of DC-DC Conversion for Energy Harvesting systems Using a Mixed-Signal Sliding-Mode Controller

Analysis of DC-DC Conversion for Energy Harvesting Systems U...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： Nathaniel J. Guilar Rajeevan Amirtharajah Paul Hurst University of California Center Sacramento Sacramento CA US Micropower Circuits and Systems Group Department of Electrical and Computer Engineering University of California Davis CA USA Solid-State Research Laboratory Department of Electrical and Computer Engineering University of California Davis CA USA

Increasing efficiencies in electronic devices have opened the door for energy harvesters to power wireless systems by scavenging energy from solar, thermal, or mechanical sources. The design of an efficient power supply that can regulate scavenged energy to produce stable voltages for multiple loads is presented here. To limit energy dissipation and increase the flexibility of the regulator, a discrete-time sliding-mode controller is presented. The performance of sliding-mode controllers is hard to predict because their switching frequency and output voltage ripple are dependent on duty cycle and load conditions. An analytical approach for the closed-loop steady- state behavior of a discrete-time sliding-mode controller is presented here. The proposed analytical solution matches measured results to within 4% for duty cycles ranging between 0.1 and 0.9.

关键词： Sliding mode control Control systems Regulators Finite impulse response filter Voltage Pulse width modulation Samarium Power supplies circuits Passive filters

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