1,720,967 research outputs found
Dataset for 'A Si Optical Modulator based on Fano-like Resonance'
No full textThis dataset supports the publication: H. Du, W. Zhang, W. Cao, D. J. Thomson, C. G. Littlejohns, X. Yan, D. T. Tran, M. Banakar, G. T. Reed (2021) 'A Si Optical Modulator based on Fano-like Resonance' published in IEEE Photonics Technology Letters
In this work, we present an experimental demonstration of a carrier depletion type Si optical modulator using Fano-like resonance, which is the first of its kind in the literature. The Fano-like resonance is obtained by weak coupling between two optical resonators in the prototype device and the PN junction is designed for carrier-depletion type electro-refractive modulation. 20 Gb/s on-off keying (OOK) is obtained in experiments on the prototype device. </span
A Si Optical Modulator based on Fano-like Resonance
No full textIn this paper, we present an experimental demonstration of a Si optical modulator based on Fano-like resonance, which is the first of its kind in the literature. The Fano- like resonance is obtained through weak coupling between two optical resonators in the prototype device and a PN junction is designed for carrier-depletion type electro-refractive modulation. 20 Gb/s data rate on-off keying (OOK) is obtained experimentally on the prototype device. Compared with a ring resonator modulator with a similar optical resonance linewidth, a Fano-like resonance based modulator can potentially have a higher extinction ratio (ER) because the Fano-like resonance has an asymmetric spectrum line shape and the line shape on one side can be sharper than the Lorentz resonance line shape of a ring resonator
High target utilisation sputtering for the development of advanced materials for magnetic data storage applications
No full textHigh target utilisation sputtering (HiTUS) is a relatively new thin film deposition
technique that generates a high density plasma remotely from the sputter target.
This method has been employed firstly to investigate FePt and FePtN thin films
for high density data storage media applications and secondly to investigate the
production of a GMR/PZT hybrid structure (multi-ferroism) for improvements to
magneto-resistive read-sensor devices in hard disk drives and potentially for other
novel multi-ferroic applications.
The magnetic and structural properties of FePt and FePtN films, prepared by the
HiTUS method, on both silicon and glass substrates have been investigated before
and after annealing at temperatures in the range of 300 to 800 ◦C. It is shown that
during thermal annealing there is a degradation in magnetic properties of the FePt
films at around 400 ◦C due to the formation of silicides as the thermal processing
promotes the reaction of the film with the substrate. However, in the FePtN samples
coercivity values continue to rise with annealing temperatures above 400 ◦C. XRD
analysis confirms that silicide formation is suppressed in films containing nitrogen
up to 800 ◦C. Using the HiTUS technique, there is evidence that L10 ordering of
FePt has occured at annealing temperature of 400 ◦C with in plane and out of plane
coercivities of 7180 Oe and 6300 Oe respectively.
Finally, it is shown that HiTUS is capable of depositing ultra thin multilayer
GMR structures onto a variety of substrates; silicon, glass, flexible kapton film and
PZT. It is interesting to find that the GMR ratio obtained on kapton film (14.39
%) is almost as high as that on silicon (16.15 %), with much scope for improve-
ment. Multi-ferroic composite films consisting of the GMR multilayer structure
[Co(8 °A)/Cu(21 °A)]×20/Co(12 °A) on PZT substrates were fabricated and magneto-
electric coupling effects explored. It was found that AC voltages applied across the
composite GMR/PZT structure produced a marked decrease in the coercivity of the
GMR layer. However, DC voltages did not produce any measurable magnetic effects.
Careful investigation revealed that the reduction in coercivity observed during AC
measurements was, in fact, due to sample heating effects
Dataset for "Silicon-on-insulator free-carrier injection modulators for the mid-infrared"
No full textThis datset contains an Excel file with the data used to plot the graphs shown in Silicon-on-insulator free-carrier injection modulators for the mid-infrared by M. Nedeljkovic et al accepted for publication in Optics Letters in December 2018. </span
Silicon photonic beam steering module with backside coupling elements toward dense heterogeneous integration with drive electronics
No full textSolid state beam steering devices are key elements in low cost, robust, three-dimensional imaging systems. Here we present a silicon photonic beam steering device based upon an 8 x 8 grating coupler focal plane array approach fed by a thermo-optic Mach Zehnder switching tree. In this device transmission of the light from the grating couplers is made through the back side of the chip using topside mirrors allowing for both high efficiency out coupling and direct flip-chip integration of drive electronics, providing a path to scale to denser focal plane arrays with large numbers of points in the future. -13.8dB fibre-to-fibre transmission was achieved in our preliminary test around 1523 nm for the beam steering chip
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Dataset supporting the publication "Buried 3D spot-size converters for silicon photonics"
No full textData underlying the results presented in the paper W. Zhang, M. Ebert, J. D. Reynolds, B. Chen, X. Yan, H. Du, M. Banakar, D. T. Tran, C. G. Littlejohns, G. T. Reed, and D. J. Thomson, "Buried 3D spot-size converters for silicon photonics," Optica 8, 1102-1108 (2021)</span
Study into the spread of heat from thermo-optic silicon photonic elements
No full textDataset to support article in Journal: Optics Express. Experimentally characterized and simulated data for heat spread from a heating element in Silicon photonics based Thermo-optics Phase shifter. https://doi.org/10.1364/OE.426748
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Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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