1,721,050 research outputs found
Dataset for: Mid-infrared silicon-on-insulator wavegudes with single-mode propagation over an octave of frequency
No full textExperimental and simulation data for the paper: Callum J. Stirling, Wei Cao, Jamie D. Reynolds, Zhibo Qu, Thomas D. Bradley, Lorenzo Mastronardi, Frederic Y. Gardes, Goran Z. Mashanovich, Milos Nedeljkovic. (2021). Mid-infrared silicon-on-insulator wavegudes with single-mode propagation over an octave of frequency, Optics Expres
Dataset for: Mid-infrared silicon-on-insulator waveguides with single-mode propagation over an octave of frequency
No full textExperimental and simulation data for the paper:
Callum J. Stirling, Wei Cao, Jamie D. Reynolds, Zhibo Qu, Thomas D. Bradley, Lorenzo Mastronardi, Frederic Y. Gardes, Goran Z. Mashanovich, Milos Nedeljkovic. (2021). Mid-infrared silicon-on-insulator wavegudes with single-mode propagation over an octave of frequency, Optics Express</span
Data for Germanium-on-silicon waveguides operating at mid-infrared wavelengths up to 8.5um
No full textThe .xslx file contains the tabulated numerical data used to create the figures in "Germanium-on-silicon waveguides operating at mid-infrared wavelengths up to 8.5um",
by Milos Nedeljkovic, Jordi Soler Penades, Vinita Mittal, Ganapathy Senthil Murugan, Ali Z. Khokhar, Callum Littlejohns, Lewis G. Carpenter, Corin B. E. Gawith, James S. Wilkinson, and Goran Z. Mashanovich
published in Optics Express, accepted in September 2017.
The .txt file contains a brief description of the .xslx file.</span
Dataset for High-speed silicon modulators for the 2 μm wavelength band
No full textData supporting the paper:
Wei Cao, David Hagan, David J. Thomson, Milos Nedeljkovic, Callum G. Littlejohns, Andy Knights, Shaif-Ul Alam, Junjia Wang, Frederic Gardes, Weiwei Zhang, Shenghao Liu, Ke Li, Mohamed Said Rouifed, Guo Xin, Wanjun Wang, Hong Wang, Graham T. Reed, and Goran Z. Mashanovich, "High-speed silicon modulators for the 2  μm wavelength band," Optica 5, 1055-1062 (2018) DOI:10.1364/OPTICA.5.001055</span
Dataset supporting the publication "Design of integrated silicon waveguides for Raman-enhanced four-wave mixing in the telecom band"
No full textDataset supporting the publication:
Shiyu Sun, Goran Z. Mashanovich, and Anna C. Peacock, "Design of integrated silicon waveguides for Raman-enhanced four-wave mixing in the telecom band," Opt. Express 32, 8715-8722 (2024) https://doi.org/10.1364/OE.509992
The data includes two excel files: data for paper.xlsx and dispersion data.xlsx.
-Data for paper.xlsx: contains the conversion efficiency and Stokes output power for different etch dpeth, width of rib waveguide;
-Dispersion data.xlsx: contains second order dispersion parameters for different waveguide structures.
Dispersion parameters were calculated by COMSOL.
Related projects:
Chinese Scholarship Council(CSC); Engineering and Physical Sciences Research Council (EPSRC) (EP/P000940/1); High Value Photonic Manufacturing (EP/N00762X/1)
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Mid-IR silicon photonics
No full textMid-IR silicon photonics is attracting interest due to a host of potential applications. As the mid-IR covers a wide range of wavelengths, there are several material platforms that are being investigated. Three of them will be presented in more details: silicon-on-insulator (SOI), suspended Si and Ge on Si. A number of passive and active devices have been demonstrated up to a wavelength of 4 µm, such as low loss SOI waveguides (rib, strip, slot), efficient couplers, filters, multiplexers and spectrometers, as well as modulators and detectors. To extend transparency of SOI waveguides, bottom oxide cladding can be removed. A new technique based on subwavelength gratings has been developed and a library of passive devices have been designed and fabricated. This approach involves only one dry etch step and offers more mechanically robust structures. Successful realisation of sub dB/cm waveguides and low loss bends, MMIs, MZIs, directional and grating couplers in the mid-IR will be presented. Ge on Si material can have larger transparency range than suspended Si . Sub dB/cm waveguides and low loss passive devices in this platform have been demonstrated, as well as all optical modulation and two photon absorption measurements. Finally a theoretical investigation free carrier optical modulation in Ge has been carried out
Mid-infrared silicon photonics
No full textThe mid-infrared wavelength region (3-20 µm) offers several application areas. In this paper we present silicon photonics devices designed for 3-4 µm including rib, strip and PhC waveguides, MMIs, ring resonators, and Mach-Zehnder interferometers. The devices are based on silicon on insulator (SOI) platform. We show that 400-500 nm high silicon waveguides can have the propagation loss as low as ~ 4 dB/cm at 3.8 µm. We also demonstrate MMIs with insertion loss of 0.2 dB, high extinction ratio asymmetric Mach-Zehnder interferometers, and SOI ring resonators. This, combined with our previous results reported at 3.4 µm, confirms that SOI is a viable platform for the 3-4 µm region
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
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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