1,721,129 research outputs found
Power Insensitive Silicon Microring Resonators
No full textWe demonstrate power insensitive silicon microring resonators without the need for active feedback control. The passive control of the resonance is achieved by utilizing the compensation of two counteracting processes, free carrier dispersion blueshift and thermo-optic redshift. In the fabricated devices, the resonant wavelength shifts less than one resonance linewidth for dropped power up to 335 μW, more than fivefold improvement in cavity energy handling capability compared to regular microrings. © 2012 Optical Society of America.374590592Miller, D.A.B., (2000) IEEE J. Sel. Top. Quantum Electron., 6, p. 1312Soref, R., (2006) IEEE J. Sel. Top. Quantum Electron., 12, p. 1678Haurylau, M., Chen, G.Q., Chen, H., Zhang, J.D., Nelson, N.A., Albonesi, D.H., Friedman, E.G., Fauchet, P.M., (2006) IEEE J. Sel. Top. Quantum Electron., 12, p. 1699Oehrlein, G.S., (1989) Mater. Sci. Eng. B, 4, p. 441Borselli, M., Johnson, T.J., Painter, O., (2005) Opt. Express, 13, p. 1515Soltani, M., Li, Q., Yegnanarayanan, S., Adibi, A., (2007) Opt. Express, 15, p. 17305Almeida, V.R., Lipson, M., (2004) Opt. Lett., 29, p. 2387Barclay, P.E., Srinivasan, K., Painter, O., (2005) Opt. Express, 13, p. 801He, L., Xiao, Y.F., Dong, C., Zhu, J., Gaddam, V., Yang, L., (2008) Appl. Phys. Lett., 93, p. 201102Schmidt, C., Chipouline, A., Kasebier, T., Kley, E.B., Tunnermann, A., Pertsch, T., (2010) Opt. Lett., 35, p. 3351Grudinin, I., Lee, H., Chen, T., Vahala, K., (2011) Opt. Express, 19, p. 7365Soltani, M., (2009) Novel Integrated Silicon Nanophotonic Structures Using Ultra-high Q Resonators, , Ph.D. thesis (Georgia Institute of Technology)Cardenas, J., Poitras, C.B., Robinson, J.T., Preston, K., Chen, L., Lipson, M., (2009) Opt. Express, 17, p. 4752Luo, L.W., Wiederhecker, G.S., Cardenas, J., Poitras, C., Lipson, M., (2011) Opt. Express, 19, p. 6284Almeida, V.R., Barrios, C.A., Panepucci, R.R., Lipson, M., (2004) Nature, 431, p. 1081Campenhout, J.V., Green, W.M.J., Liu, X., Assefa, S., Osgood, R.M., Vlasov, Y.A., (2009) Opt. Lett., 34, p. 153
An all-optical feedback assisted steady state of an optomechanical array
No full textWe explore the effect of all-optical feedback on the steady state dynamics of optomechanical arrays arising from various topologies. First we consider an array comprised of a pair of independent optomechanical cavities coupled reversibly via their optical modes. Next we consider an optomechanical network formed from coupling two optical modes with interactions mediated via a common mechanical mode. Finally we extend the analysis to a large network of N-coupled optomechanical systems. Our results show implementing an-all optical feedback loop in each arrangement can enhance the degree of steady state entanglement between inter cavity optical and mechanical modes
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Tailored Resonance Dependence On Input Optical Power In Silicon Microring Resonators
No full textWe demonstrate the ability to tailor the resonance dependence on input power in silicon microring resonators using a passive technique by utilizing two counteracting processes, free carrier dispersion blueshift and thermo-optic redshift. In our fabricated silicon microring resonators, we achieve an effective blueshift, as well as effective redshift. We also design and fabricate a power insenstive silicon microring that has a five-fold improvement in cavity energy handling capability compared to a regular microring. © 2012 IEEE.Miller, D.A.B., Optical interconnects to silicon (2000) IEEE Journal Oj Selected Topics in Quantum Electronics., 6, pp. 1312-1317. , Nov-DecSoref, R., The past, present, and future of silicon photonics (2006) IEEE Journal Oj Selected Topics in Quantum Electronics., 12, pp. 1678-1687. , Nov-DecHaurylau, M., On-chip optical interconnect roadmap: Challenges and critical directions (2006) IEEE Journal OJSelected Topics in Quantum Electronics., 12, pp. 1699-1705. , Nov-DecBarclay, P.E., Srinivasan, K., Painter, O., Nonlinear response of silicon photonic crystal microresonators excited via an integrated waveguide and fiber taper (2005) Optics Express, 13, pp. 801-820. , Feb 7Soltani, M., (2009) Novel Integrated Silicon Nanophotonic Structures Using Ultra-high Q Resonators, , Ph. D Thesis Georgia Institute of TechnologyCardenas, J., Low loss etch less silicon photonic waveguides (2009) Optics Express, 17, pp. 4752-4757. , Mar 16Luo, J.W., Wiederhecker, G.S., Cardenas, J., Poitras, C., Lipson, M., High quality factor etch less silicon photonic ring resonators (2011) Optics Express, 19, pp. 6292-6297. , Mar 28Almeida, V.R., Barrios, C.A., Panepucci, R.R., Lipson, M., All-optical control of light on a silicon chip (2004) Nature, 431, pp. 1081-1084. , Oct 28Van Campenhout, J., Silicon-nitride surface passivation of submicrometer silicon waveguides for low-power optical switches (2009) Optics Letters, 34, pp. 1534-1536. , May 1
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Synchronization Of Coupled Optomechanical Oscillators
No full textWe demonstrate experimentally the synchronization of two micromechanical oscillators actuated by the optical radiation field. The mutual coupling is purely optical and fully tunable. Upon synchronization, the phase noise drops in agreement with the prediction. © 2012 OSA.Kaka, S., Pufall, M.R., Rippard, W.H., Silva, T.J., Russek, S.E., Katine, J.A., Mutual phase-locking of microwave spin torque nano-oscillators (2005) Nature, 437 (7057), pp. 389-392Mohanty, P., Shim, S.B., Imboden, M., Synchronized oscillation in coupled nanomechanical oscillators (2007) Science, 316 (5821), pp. 95-99Kippenberg, T.J., Vahala, K.J., Cavity opto-mechanics (2007) Optics Express, 15 (25), pp. 17172-17205Wiederhecker, G.S., Chen, L., Gondarenko, A., Lipson, M., Controlling photonic structures using optical forces (2009) Nature, 462 (7273), pp. 633-U103Lin, Q., Rosenberg, J., Jiang, X., Vahala, K.J., Painter, O., Mechanical oscillation and cooling actuated by the optical gradient force (2009) Physical Review Letters, 103 (10), p. 103601Manipatruni, S., Wiederhecker, G.S., Lipson, M., Long-range synchronization of optomechanical structures Quantum Electronics and Laser Science Conference, 2011Heinrich, G., Ludwig, M., Qian, J., Kubala, B., Marquardt, F., Collective dynamics in optomechanical arrays (2011) Physical Review Letters, 107 (4), p. 043603Hossein-Zadeh, M., Vahala, K.J., Observation of injection locking in an optomechanical rf oscillator (2008) Applied Physics Letters, 93 (19), pp. 191115-191115-3Chang, H.C., Cao, X., Mishra, U.K., York, R.A., Phase noise in coupled oscillators: Theory and experiment (1997) Microwave Theory and Techniques, IEEE Transactions on, 45 (5), pp. 604-61
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