1,721,111 research outputs found
Diamond in fibre magnetometry: understanding the effects of step-index fibre design on dipole coupling
No full textpaper C7H_4Hybrid diamond-fibre systems are interesting as robust platforms for magnetometry. Here we model the coupling between diamond fluorescent emitters and guided fibre modes for three core-cladding ratios, and varying core diameter to inform our experimental investigations.Shuo Li, Dongbi Bai, Andrew D. Greentree, Scott Foster, Heike Ebendorff-Heidepriem, Shahraam Afshar and Brant C. Gibso
Nanodiamond in tellurite glass Part I: origin of loss in nanodiamond-doped glass
No full textAbstract not availableHeike Ebendorff-Heidepriem, Yinlan Ruan, Hong Ji, Andrew D. Greentree, Brant C. Gibson, and Tanya M. Monr
Nanodiamond in tellurite glass Part II: practical nanodiamond-doped fibers
No full textAbstract not availableYinlan Ruan, Hong Ji, Brett C. Johnson, Takeshi Ohshima, Andrew D. Greentree, Brant C. Gibson, Tanya M. Monro, and Heike Ebendorff-Heideprie
Optical fibre coated with diamond nanocrystals: novel sensing architecture
No full textTheoretical model of power radiated by a nanodiamond crystal located at the surface of a fiber shows narrow peaks that are extremely sensitive to the refractive-index of the surrounding environment suggesting an architecture for efficient refractive-index sensing.Shahraam Afshar V., Matthew R. Henderson, Andrew D. Greentree, and Tanya M. Monrohttp://www.iqec-cleopr2011.com/http://www.opticsinfobase.org/abstract.cfm?URI=CLEOPR-2011-C54
Efficient coupling of emission of embedded single photon sources within optical fibres
No full textWe investigate the coupling of single photon emission from diamond colour centres embedded within the fibre core into the fibre’s guided modes. By approximating diamond colour centre emission as a dipole, we investigate the capture power for different core sizes and for various locations and orientations of the emitting dipole. We then use finite-difference time domain methods to check predictions of this calculation.Matthew R. Henderson, Shahraam Afshar V., Andrew D. Greentree, Heike Ebendorff-Heidepriem and Tanya M. Monrohttp://www.plevin.com.au/acoftacols2009/Program.pd
Dipole emitters in fiber: Interface effects, collection efficiency and optimization
No full textLink to a related website: http://pdfs.semanticscholar.org/9647/84b9be3c8a5fdcf6d3610294a5ccb3c984b5.pdf, Open Access via UnpaywallSingle photon emitters coupled to optical fibers are becoming important as sources of non-classical light and nano-scale sensors. At present it is not possible to efficiently interface single photon emitters with the optical fiber platform, and there are particular challenges associated with the need to ensure highly efficient collection and delivery of emitted photons. To model single particle emission, we have considered the coupling of a dipole to an optical fiber mode as a function of orientation and position with respect to the core-cladding interface. Our model shows that it is possible to significantly enhance the collection efficiency into the guided modes as a result of modifications to the dipole emission pattern and power resulting from the surrounding fiber environment. For certain geometries the fiber-dipole coupling can result in a factor of 2.6 increase in the power emitted by the dipoleMatthew R. Henderson, Shahraam Afshar V., Andrew D. Greentree, and Tanya M. Monr
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Magnetically sensitive nanodiamond-doped tellurite glass fibers
Get PDFTraditional optical fibers are insensitive to magnetic fields, however many applications would benefit from fiber-based magnetometry devices. In this work, we demonstrate a magnetically sensitive optical fiber by doping nanodiamonds containing nitrogen vacancy centers into tellurite glass fibers. The fabrication process provides a robust and isolated sensing platform as the magnetic sensors are fixed in the tellurite glass matrix. Using optically detected magnetic resonance from the doped nanodiamonds, we demonstrate detection of local magnetic fields via side excitation and longitudinal collection. This is a first step towards intrinsically magneto-sensitive fiber devices with future applications in medical magneto-endoscopy and remote mineral exploration sensing.Yinlan Ruan, David A. Simpson, Jan Jeske, Heike Ebendorff-Heidepriem, Desmond W. M. Lau, Hong Ji, Brett C. Johnson, Takeshi Ohshima, Shahraam Afshar V., Lloyd Hollenberg, Andrew D. Greentree, Tanya M. Monro, Brant C. Gibso
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