1,720,978 research outputs found
Microwave Sound-light Interactions In Nano-structured Photonic Crystal Fibres
No full textThe interaction between light and microwave sound can be strongly enhanced by tight confinement within the wavelength-scale core of a nano-structured photonic crystal fibre. A new family of efficient acousto-optical and nonlinear-optical devices is emerging. ©2008 IEEE.149150Purcell, E.M., Spontaneous transition probabilities in radio-frequency spectroscopy (1946) Physical Review, 69, p. 681Russell, P.S.J., Photonic-crystal fibers (2006) Journal of Lightwave Technology, 24, pp. 4729-4749Dainese, P., Russell, P.S.J., Joly, N., Knight, J.C., Wiederhecker, G.S., Fragnito, H.L., Laude, V., Khelif, A., Stimulated Brillouin scattering from multi-GHz-guided acoustic phonons in nanostructured photonic crystal fibres (2006) Nature Physics, 2, pp. 388-392Dainese, P., Russell, P.S.J., Wiederhecker, G.S., Joly, N., Fragnito, H.L., Laude, V., Khelif, A., Raman-like light scattering from acoustic phonons in photonic crystal fiber (2006) Optics Express, 14, pp. 4141-4150Russell, P.S.J., Marin, E., Diez, A., Guenneau, S., Movchan, A.B., Sonic band gaps in PCF preforms: Enhancing the interaction of sound and light (2003) Optics Express, 11, pp. 2555-2560Beugnot, J.C., Sylvestre, T., Maillotte, H., Melin, G., Laude, V., Guided acoustic wave Brillouin scattering in photonic crystal fibers (2007) Optics Letters, 32, pp. 17-19Wiederhecker, G.S., Brenn, A., Fragnito, H.L., Russell, P.S.J., Coherent control of ultrahigh-frequency acoustic resonances in photonic crystal fibers (2008) Physical Review Letters, 100, p. 20390
Forward Brillouin Scattering In Tapered Optical Fibers
No full textWe experimentally study forward Brillouin scattering in tapered fibers. Circularly symmetric acoustic phonons resonant in fibers are observed by using a novel photoacoustic measurement technique. Strong acousto-optic interaction can take place in highly tapered fibers. © 2008 Optical Society of America.Dainese, P., Russell, P.S.J., Wiederhecker, G.S., Joly, N., Fragnito, H.L., Laude, V., Khelif, A., Raman-like light scattering from acoustic phonons in photonic crystal fiber (2006) Opt. Express, 14, pp. 4141-4150Elser, D., Andersen, U.L., Korn, A., Glöckl, O., Lorenz, S., Marquardt, C., Leuchs, G., Reduction of guided acoustic wave Brillouin scattering in photonic crystal fibers (2006) Phys. Rev. Lett., 97, p. 133901Beugnot, J., Silvestre, T., Maillotte, H., Mélin, G., Laude, V., Guided acoustic wave Brillouin scattering in photonic crystal fibers (2007) Opt. Lett., 32, pp. 17-19Shelby, R.M., Levenson, M.D., Bayer, P.W., Guided acoustic-wave Brillouin-scattering (1985) Phys. Rev. B, 31, pp. 5244-525
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
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
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
Spectral Replica Holes In The Ase Spectra Of Erbium-doped Fibers With Different Co-doping Elements And Erbium Concentrations
No full textWe report on the observation of spectral replica holes in Erbium Doped Fibers with different co-doping elements. Replica holes in the long wavelength region are enhanced by co-doping with Lanthanum. Increasing the Erbium concentration tends to wash out replica holes. The width and depth of holes are measured at room (300 k) and low (77 K) temperatures.111113Desurvire, E., Zyskind, J.L., Simpson, J.R., Spectral Gain Hole-Burning at 1.53 μm in Erbium-Doped Fiber Amplifiers (1990) IEEE Phot. Technol. Lett., 2 (4), pp. 246-248Srivastava, A.K., Sun, Y., Advanced in Erbium-Doped Fibers Amplifiers (2002) Optical Fiber Telecommunications IVA: Components, , I. Kaminow and T. Li (Eds.), San Diego: Academic Press, ch 4Desurvure, E., Bayart, D., Desthieux, B., Bigo, S., (2002) Erbium Doped Fiber Amplifiers: Device and System Developments, , New York: WilleyArellano, W.A., Berendt, M.O., Rieznik, A.A., De Faria, I., Fragnito, H.L., Observation of Spectral Hole Burning in the Amplified Spontaneous Emission Spectrum of Erbium Doped Amplifiers (2000) IX Simpósio Brasileiro de Microondas e Optoeletrônica, pp. 122-124. , João Pessoa, PB, 07-10 AgostoSulhoff, J.W., Srivastava, A.K., Wolf, C., Sun, Y., Zyskind, J.L., Spectral-Hole Burning in Erbium Doped Silica and Fluoride Fibers (1997) IEEE Photon. Technol. Lett., 9 (12), pp. 1578-1580Mayer Alegre, T.P., Wiederhecker, G.S., Rieznik, A.A., Fragnito, H.L., Observation of Replica Holes in Erbium Doped Silica Fiber (2003) XIX Encontre Nacional de Física da Matéria Condensada (ENFMC), , accepted for presentation, Caxambu, Brazil, May, 06-10Rudkevich, E., Baney, D.M., Stimple, J., Derickson, D., Wang, G., Nonresonant Spectral-hole Burning in Erbium-doped Fiber Amplifier
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
- …
