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Polarization-selective diffractive optical elements with an index-matching gap material

applied OPTICS 1997年第20期36卷 4681-4685页

作者： Nieuborg, N Kirk, A Morlion, B Thienpont, H Veretennicoff, I []The authors are with the Department of Applied Physics Laboratory for Photonic Computing Perception Vrije Universiteit Brussel Pleinlaan 2 B-1050 Brussel Belgium.

Highly polarization-selective diffractive optical elements for use in optical interconnection and routing systems have been fabricated by the wet etching of pairs of calcite substrates and characterized experimentally. We show that when an index-matching polymer is used to fill the gap between the two substrates, substrate alignment problems are eliminated and efficiency is greatly increased. This has resulted in first-order diffraction efficiencies of 40.5% and polarization contrast ratios of 450:1 for several off-axis binary-phase elements, allowing these components to be used for practical applications. (C) 1997 Optical Society of America.

关键词： diffractive optical elements birefringence index-matching polymers optical interconnects

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Polarimetric Optical Fibre Sensors : Aspects of Sensitivity and Practical Implementation. 11

Polarimetric Optical Fibre Sensors : Aspects of Sensitivity ...

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11th Optical Fiber Sensors Conference, OFS 1996

作者： Verbandt, Y. Verwilghen, B. Cloetens, P. Kempen, L. Van Thienpont, H. Veretennicoff, I. Vinckenroy, G. Van Wilde, W. P. De Voet, M.R.H. Applied Physics Department Lab for Photonic Computing and Perception Vrije Universiteit Brussel Pleinlaan 2 Brussel1050 Belgium Structural Analysis Department Vrije Universiteit Brussel Pleinlaan 2 Brussel1050 Belgium Identity E.e.i.g. Ispralaan 75 Mol 2400 Belgium

An analytical model for the pressure and strain sensitivity of birefringent fibres is proposed in agreement with numerical calculations. Results of polarimetry and coherence-multiplexing are presented together with a ... 详细信息

ISBN: (纸本)0819430447

关键词： Polarimeters

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Demonstration of parallel optical data input for arrays of PnpN optical thyristors

Demonstration of parallel optical data input for arrays of P...

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International Conference on Massively Parallel Processing Using Optical Interconnections

作者： A. Kirk H. Thienpont V. Baukens N. Debaes A. Gouler P. Heremans M. Kuijk G. Borghs R. Vounckx I. Veretennicoff Department of Electrical Engineering McGill University Montreal QUE Canada Lab for Photonic Computing and Perception Department of Applied PhysicsTW-TONA Vrije Universiteit Brussel VUB Brussels Belgium Vrije Universiteit Brussel Faculteit Wetenschappen en Bio-ingenieurswetenschappen Brussel Brussel BE IMEC Leuven Belgium

To provide parallel optical data input to optical information processing systems a choice must be made between highly parallel modulator arrays and (currently) moderately parallel arrays of active sources. Two technologies are compared for suitability to address arrays of differential pairs of PnpN optical thyristors; these are liquid crystal display devices (LCDs) and vertical cavity surface emitting lasers (VCSELs). An 8/spl times/8 array of thyristor pairs is addressed optically with a LCD and a single thyristor pair is driven with a VCSEL pair. The trade-offs between speed and parallelism are considered in each case and desirable properties for future devices are determined.

关键词： Optical arrays Optical modulation Vertical cavity surface emitting lasers Stimulated emission Thyristors Information processing Optical devices Liquid crystal displays Laser modes Surface emitting lasers

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Fabrication of monolithic integrated fiber-lens connector arrays by deep proton irradiation

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Microsystem Technologies 1995年第1期2卷 114-118页

作者： Kufner, M. Kufner, S. Laboratory for Photonic Computing and Perception Department of Applied Physics TW-TONA Vrije Universiteit Brussel Brussel B-1050 Belgium

Deep proton irradiation in poly (methyl methacrylate) (PMMA) is a fabrication method for monolithic integrated micro optics which offers high stability and interesting autoalignment features. The process consists of three basic steps: irradiation of a PMMA substrate followed by either a development of the irradiated regions or a swelling of the irradiated regions by organic vapor or both applied to different regions. With this technique a variety of elementary refractive microoptical components and monolithically integrated combinations can be fabricated: microlenses, microprisms, beam splitters, fiber connectors with selfaligned microlenses on top of each fiber. © 1995 Springer-Verlag.

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A case study for the implementation of a stochastic bit stream neuron;the choice between electrical and optical interconnects

A case study for the implementation of a stochastic bit stre...

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International Conference on Massively Parallel Processing Using Optical Interconnections

作者： M.A. Hands W. Peiffer H. Thienpont A. Kirk T.J. Hall Laboraotory for Photonic Computing and Perception Department of Applied Physics TW-TONA Vrije Universiteit Brussel Brussels Belgium Department of Electronic and Electrical Engineering King's College University of London London UK

A neural network architecture is described which uses stochastic processing techniques to perform the weighted input multiplication, summation and thresholding processes of a neuron using the optimal amount of hardware. It is argued that the advantage of this approach is that it will allow large neural networks to be fabricated with relatively small amounts of hardware. The architecture allows a choice to be made between the speed and accuracy of processing, as well as a choice of hardware. Implementations of a bit stream neuron using electronic, optoelectronic and optical hardware are developed and their capabilities are compared based on speed of processing and network size. The aim of the study is to investigate the capabilities of optical logic in distributed processing systems, together with the use of the optical thyristor as logic elements. It is shown that optical processing and optical interconnection allows a simplification of the processing sequence and allows the parallelism of distributed systems to be utilised.

关键词： Stochastic processes Optical interconnections Neural network hardware Neural networks Neurons Logic Optical computing Optical fiber networks Distributed processing Thyristors

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Design of polarisation selective grating structures for surface emitting lasers

Design of polarisation selective grating structures for surf...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： B. Dhoedt B. Demeulenaere R. Baets C. VandePoel H. Thienpont Department of InformationTechnology University of Ghent Ghent Belgium Laboratory for Photonic Computing and Perception Department of Applied Physics Vrije Universiteit Brussel Brussels Belgium

Polarisation control of light emission from a vertical cavity surface emitting laser (VCSEL) is a major issue to realise stable operation and to use these components in polarisation dependent applications. Recently, a polarisation control mechanism was proposed,1 based on incorporation of a birefringent dielectric/metal grating in the laser cavity. In this paper, we investigate the design of a purely dielectric grating as polarisation selective element (Fig. 1) and output coupler.

关键词： Surface emitting lasers Optical design Gratings Vertical cavity surface emitting lasers Optical polarization Reflectivity Semiconductor lasers Optical control Birefringence Laser stability

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Multiple instruction multiple data optical computing with photothyristor smart pixels

Multiple instruction multiple data optical computing with ph...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： T. Van de Velde H. Thienpont Free University Brussels Faculty of Applied Sciences Applied Physics Department Lab for Photonic Computing and Perception Pleinlaan 2 B-1050 Brussels Belgium

Recently a very promising active bistable vertical-to-surface transition electrophotonic device was developed to perform chip-to-chip optical interconnects—the PnpN photothyristors (Fig. 1). When used in the configuration of a differential pair, these multilayer III-V semiconductor (GaAs/AlGaAs) structures are capable of emitting a binary optical signal, when receiving a 250 fj optical input and controlled by a voltage cycle with period less than 70 ns.1

关键词： Optical computing Photothyristors Smart pixels Stimulated emission Optical bistability Integrated optics Optical control Optical interconnections Thyristors Convolution

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Demonstrator circuitry for optical data transcription and digital optical logic based on differential pairs of optical thyristors

Demonstrator circuitry for optical data transcription and di...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： H. Thienpoint T. van de Velde W. Peiffer A. Kirk M. Kuijk L. Dognin J. Fernandez I. Veretennicoff R. Vounckx P. Heremans G. Borghes Free University Brussels Applied Physics Department (TW/ TONA) Lab for Photonic Computing and Perception Pleinlaan 2 B-1050 Belgium Free Univeristy Brussels Applied Physics Department (TW/TONA) Lab for Microelectronics and Technology Pleinlaan 2 B-1050 Belgium Interuniversity Micro Electronics Center Kapeldreff 75 B-3001 Leuven Belgium

Among the most promising elements for digital parallel optical information processing are differential pairs of PnpN optical thyristors. We have shown very recently that these optical detector-generator type of devices can be switched-on in very short times (typical 10 ns) with very low switching energies (typical 40 fj of absorbed optical energy), while the problem of slow switch-off times, causing unpractical cycle times, was tackled using a double-heterojunction structure that can be completely depleted by means of a simple negative anode-to-cathode low voltage pulse. In this way PnpN thyristors with switch-off times of 10 ns became available.1

关键词： Logic circuits High speed optical techniques Optical saturation Thyristors Optical interconnections photonics Electron optics Hardware Voltage physics

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Silicon implanted oxide multifunctional optical switches for smart pixel arrays

Silicon implanted oxide multifunctional optical switches for...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： H. Thienpont W. Peiffer I. Veretennicoff C. de Tandt W. Randson R. Vounckx A. Koster Lab for Photonic Computing and Perception Applied Physics Department (TW/TONA) Vrije Universiteit Brussel Pleinlaan 2 B-1050 Brussel Belgium Labfor Microelectronics and Technology Applied Physics Department (TW/TONA) Vrije Universiteit Brussel Pleinlaan 2 B-1050 Brussel Belgium Institut d'Electronique Fondamentale (IEF) CNRS UA22 Université Paris-Sud Bat. 220 91405 Orsay France

In this paper we report on the progress which has been made in the fabrication and use of 2-D optical logic planes consisting of silicon hybrid electrically assisted thermo-optic resonators (HEATORS).1

关键词： Optical arrays Silicon Optical switches Smart pixels Optical resonators Circuits High speed optical techniques Nonlinear optics Optical sensors Optical modulation

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