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Giuseppe Coppola

Bio: Giuseppe Coppola is an academic researcher from National Research Council. The author has contributed to research in topics: Digital holography & Holography. The author has an hindex of 40, co-authored 256 publications receiving 5489 citations. Previous affiliations of Giuseppe Coppola include Seconda Università degli Studi di Napoli & University of Naples Federico II.


Papers
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Proceedings ArticleDOI
20 May 2015
TL;DR: In this paper, a parallel-channel microfluidic device exploiting cross-filtering to perform hydrodynamic focusing has been designed and successfully tested with Leukemia cells, and represents a step forward the realization of an on-chip integrated cytofluorimeter.
Abstract: A novel parallel-channel microfluidic device exploiting cross-filtering to perform hydrodynamic focusing has been designed and successfully tested with Leukemia cells. The proposed approach allows to overcome the main limits till now presented by previous devices, and represents a step forward the realization of an on-chip integrated cytofluorimeter.
Proceedings ArticleDOI
15 May 2001
TL;DR: In this article, the authors proposed an optoelectronic integrated router based on a waveguide with a liquid crystal over-layer, working at the wavelength of 1.55 micron.
Abstract: A novel configuration for an optoelectronic integrated router based on a waveguide with a liquid crystal over- layer, working at the wavelength of 1.55 micron, is theoretically discussed for the first time. The device is based on the mode-mixing principle together with the electro-optic effect of a smectic A * liquid crystal. The device is composed by a single mode input optical channel waveguide, a bimodal active region, with a liquid crystal over-layer as cover, and an output Y branch to separate the two output channels. The active region is designed to allow a (pi) shift between the two modes that it supports, by means the variation of the effective refractive index of guided modes due to molecular reorientation of liquid crystals indued by an electrical field. By doing so it is possible to steer light from one output channel to the other one. Exhaustive detail about the design both of the input waveguide and of the active region has been given together with the description of the optical behavior of our device. Numerical simulations have shown how this kind of router exhibits satisfactory performances.
Journal ArticleDOI
TL;DR: The cytogenetic study on the chromosomal makeup and breeding data of 29 boars housed in a Canadian pig farm revealed that three aberrations seemed to be responsible for ~35% decrease in prolificacy.
Abstract: A cytogenetic study was undertaken on the chromosomal makeup and breeding data of 29 boars housed in a Canadian pig farm. Blood cultures were made and chromosome spreads were examined, searching for carriers of chromosomal abnormalities. The investigation revealed that twenty-six individuals had a normal karyotype and 3 (10.3%) carried the following aberrations: (a) two 1/6 translocations in two - unrelated - individuals, (b) one reciprocal translocation rcp(10;13). The litter size of the two boars carrying the 1/6 translocation was, on average, 6.5 and 5.8, respectively. The mean size of the litter sired by the boar carrying the rcp(10;13) was 6.0. As compared with the average litter size (11.0) sired by the normal boars in the herd, the translocations described here seemed to be responsible for ~35% decrease in prolificacy.
Proceedings ArticleDOI
13 Jun 2005
TL;DR: In this article, a two-stage method for direct perfect superimposition and comparison of Fresnel transform reconstructions of digital holograms recorded at different wavelengths is proposed and demonstrated.
Abstract: A two stage method for allowing direct perfect superimposition and comparison of Fresnel-transform reconstructions of digital holograms recorded at different wavelengths is proposed and demonstrated. The method allows to adjust the size of the reconstruction pixel by varying the reconstruction distance of the first stage. Demonstration is given by superimposing in focus numerical reconstructions of holograms recorded at different wavelengths. The method can be potentially very useful for real-time monitoring in biological processes.
Proceedings ArticleDOI
11 Mar 2003
TL;DR: In this article, a three terminal optical amplitude modulator embedded in a silicon-on-silicon rib waveguide has been proposed and experimental results performed on a quasi optimized structure.
Abstract: Optical switches and modulators are essential components in integrated optics applications. In this paper, we propose a three terminal optical amplitude modulator embedded in a silicon-on-silicon rib waveguide and we show new experimental results performed on a quasi optimized structure. The optimization of the optoelectronic behavior of the device is possible, by using both the two-dimensional electrical (2-D) semiconductor simulation package MEDICI and optical simulation codes.

Cited by
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Journal ArticleDOI

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08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

Proceedings Article
01 Jan 1999
TL;DR: In this paper, the authors describe photonic crystals as the analogy between electron waves in crystals and the light waves in artificial periodic dielectric structures, and the interest in periodic structures has been stimulated by the fast development of semiconductor technology that now allows the fabrication of artificial structures, whose period is comparable with the wavelength of light in the visible and infrared ranges.
Abstract: The term photonic crystals appears because of the analogy between electron waves in crystals and the light waves in artificial periodic dielectric structures. During the recent years the investigation of one-, two-and three-dimensional periodic structures has attracted a widespread attention of the world optics community because of great potentiality of such structures in advanced applied optical fields. The interest in periodic structures has been stimulated by the fast development of semiconductor technology that now allows the fabrication of artificial structures, whose period is comparable with the wavelength of light in the visible and infrared ranges.

2,722 citations

Journal ArticleDOI
19 May 2005-Nature
TL;DR: Electro-optic modulators are one of the most critical components in optoelectronic integration, and decreasing their size may enable novel chip architectures, and here a high-speed electro-optical modulator in compact silicon structures is experimentally demonstrated.
Abstract: Metal interconnections are expected to become the limiting factor for the performance of electronic systems as transistors continue to shrink in size. Replacing them by optical interconnections, at different levels ranging from rack-to-rack down to chip-to-chip and intra-chip interconnections, could provide the low power dissipation, low latencies and high bandwidths that are needed. The implementation of optical interconnections relies on the development of micro-optical devices that are integrated with the microelectronics on chips. Recent demonstrations of silicon low-loss waveguides, light emitters, amplifiers and lasers approach this goal, but a small silicon electro-optic modulator with a size small enough for chip-scale integration has not yet been demonstrated. Here we experimentally demonstrate a high-speed electro-optical modulator in compact silicon structures. The modulator is based on a resonant light-confining structure that enhances the sensitivity of light to small changes in refractive index of the silicon and also enables high-speed operation. The modulator is 12 micrometres in diameter, three orders of magnitude smaller than previously demonstrated. Electro-optic modulators are one of the most critical components in optoelectronic integration, and decreasing their size may enable novel chip architectures.

2,336 citations

Journal ArticleDOI
TL;DR: The techniques that have, and will, be used to implement silicon optical modulators, as well as the outlook for these devices, and the candidate solutions of the future are discussed.
Abstract: Optical technology is poised to revolutionize short-reach interconnects. The leading candidate technology is silicon photonics, and the workhorse of such an interconnect is the optical modulator. Modulators have been improved dramatically in recent years, with a notable increase in bandwidth from the megahertz to the multigigahertz regime in just over half a decade. However, the demands of optical interconnects are significant, and many questions remain unanswered as to whether silicon can meet the required performance metrics. Minimizing metrics such as the device footprint and energy requirement per bit, while also maximizing bandwidth and modulation depth, is non-trivial. All of this must be achieved within an acceptable thermal tolerance and optical spectral width using CMOS-compatible fabrication processes. This Review discusses the techniques that have been (and will continue to be) used to implement silicon optical modulators, as well as providing an outlook for these devices and the candidate solutions of the future.

2,110 citations

Journal ArticleDOI
12 Feb 2004-Nature
TL;DR: An approach based on a metal–oxide–semiconductor (MOS) capacitor structure embedded in a silicon waveguide that can produce high-speed optical phase modulation is described and an all-silicon optical modulator with a modulation bandwidth exceeding 1 GHz is demonstrated.
Abstract: Silicon has long been the optimal material for electronics, but it is only relatively recently that it has been considered as a material option for photonics1. One of the key limitations for using silicon as a photonic material has been the relatively low speed of silicon optical modulators compared to those fabricated from III–V semiconductor compounds2,3,4,5,6 and/or electro-optic materials such as lithium niobate7,8,9. To date, the fastest silicon-waveguide-based optical modulator that has been demonstrated experimentally has a modulation frequency of only ∼20 MHz (refs 10, 11), although it has been predicted theoretically that a ∼1-GHz modulation frequency might be achievable in some device structures12,13. Here we describe an approach based on a metal–oxide–semiconductor (MOS) capacitor structure embedded in a silicon waveguide that can produce high-speed optical phase modulation: we demonstrate an all-silicon optical modulator with a modulation bandwidth exceeding 1 GHz. As this technology is compatible with conventional complementary MOS (CMOS) processing, monolithic integration of the silicon modulator with advanced electronics on a single silicon substrate becomes possible.

1,612 citations