1,721,008 research outputs found
Electrically Pumped Metallo-dielectric Pedestal Nanolasers With High Thermal-conductivity Shield
No full textWe implement amorphous-Al2O3 as thermally-conductive shield in metallo-dielectric nanolasers, and demonstrate an electrically pumped device. Joint consideration of various design parameters reveals that this design allows the laser to dissipate heat through its shield, aiding thermal management in nanoscale devices.524525Lee, J.H., Khajavikhan, M., Simic, A., Gu, Q., Bondarenko, O., Slutsky, B., Nezhad, M.P., Fainman, Y., Electrically pumped sub-wavelength metallo pedestal pillar lasers (2011) Opt. Express, 19, pp. 21524-21531Ding, K., Hill, M., Liu, Z., Yin, L., Van Veldhoven, P., Ning, C., Record performance of electrical injection sub-wavelength metallic-cavity semiconductor lasers at room temperature (2013) Opt. Express, 21, pp. 4728-4733Ding, K., Ning, C., Metallic subwavelength semiconductor nanolasers (2012) Light: Sci. Appl, p. e20Ding, K., Ning, C., Fabrication challenges of electrical injection metallic cavity semiconductor nanolasers (2013) Semiconductor Science and Technology, 28, p. 124002Shane, J., Gu, Q., Vallini, F., Wingad, B., Smalley, J.S., Frateschi, N.C., Fainman, Y., Thermal considerations in electrically-pumped metallo-dielectric nanolasers (2014) SPIE OPTO, pp. 898027-898027Gu, Q., Shane, J., Vallini, F., Wingad, B., Smalley, J.S., Frateschi, N.C., Fainman, Y., Amorphous al2o3 shield for thermal management in electrically pumped metallo-dielectric nanolasers IEEE. J. Quantum. Electron, , acceptedChen, K.J., Huang, S., Aln passivation by plasma enhanced atomic layer deposition for gan switches and power amplifiers (2013) Semicond. Sci. Technol, 28, pp. 0740151-074015
Polarization weighting of Fano-type transmission through bi-dimensional metallic gratings
No full textWe demonstrate an approach allowing isolating effects of surface plasmon polariton mediated resonant transmission in a periodic grating by means of polarization rotation. The grating comprises a square array of cylindrical holes in an optically thick metallic film. Transmittance data for the co- and cross-polarized cases are described accurately with Fano-type and pure Lorentzian-type line shapes, respectively. This polarization control allows for changing the relative weights of resonant and non-resonant transmission mechanisms, thus controlling the shape and symmetry of the observed Fano-type line shapes
Electrically Pumped Metallo-dielectric Pedestal Nanolasers
No full textElectrically pumped metallo-dielectric nanolasers are demonstrated. Employing a two-step InP chemical etching, we obtain straight pedestal sidewalls and preferentially reduce the diameter of the n-doped InP cladding more than the p-doped one for optimized performance. © 2013 IEEE.DARPA; Defense Advanced Research Projects Agency; NSF; National Science Foundation; ARO; Army Research OfficeDing, K., Ning, C., Metallic subwavelength-cavity semiconductor nanolasers (2012) Light: Science & Applications, 1, pp. e20Nezhad, M.P., Simic, A., Bondarenko, O., Slutsky, B., Mizrahi, A., Feng, L., Lomakin, V., Fainman, Y., Roomtemperature subwavelength metallo-dielectric lasers (2010) Nature Photonics, 4, pp. 395-399Lee, J.H., Khajavikhan, M., Simic, A., Gu, Q., Bondarenko, O., Slutsky, B., Nezhad, M.P., Fainman, Y., Electrically pumped sub-wavelength metallo-dielectric pedestal pillar lasers (2011) Optics Express, 19, pp. 21524-21531Inamura, E., Miyamoto, Y., Tamura, S., Takasugi, T., Furuya, K., Wet chemical etching for ultrafine periodic structure: Rectangular InP corrugations of 70 nm pitch and 100 nm depth (1989) Japanese Journal of Applied Physics, 28, pp. 2193-219
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
Thermal Considerations In Electrically-pumped Metallo-dielectric Nanolasers
Get PDFMetal nanocavity-based lasers show promise for dense integration in nanophotonic devices, thanks to their compact size and lack of crosstalk. Thermal considerations in these devices have been largely overlooked in design, despite the importance of self-heating and heat dissipation to device performance. We discuss the sources of self-heating in electrically-pumped wavelength-scale nanolasers, and the incorporation of these heat sources into a heat dissipation model to calculate laser operating temperature. We apply this thermal model to an example electrically-pumped nanolaser operating at room temperature. © 2014 SPIE.8980The Society of Photo-Optical Instrumentation Engineers (SPIE)Lee, J.H., Khajavikhan, M., Simic, A., Gu, Q., Bondarenko, O., Slutsky, B., Nezhad, M.P., Fainman, Y., Electrically pumped sub-wavelength metallo-dielectric pedestal pillar lasers (2011) Optics Express, 19, pp. 21524-21531. , OctDing, K., Ning, C.Z., Fabrication challenges of electrical injection metallic cavity semiconductor nanolasers (2013) Semiconductor Science and Technology, 28, p. 124002. , NovHill, M.T., Oei, Y.-S., Smalbrugge, B., Zhu, Y., De Vries, T., Van Veldhoven, P.J., Van Otten, F.W.M., Smit, M.K., Lasing in metallic-coated nanocavities (2007) Nature Photonics, 1, pp. 589-594. , SeptNezhad, M.P., Simic, A., Bondarenko, O., Slutsky, B., Mizrahi, A., Feng, L., Lomakin, V., Fainman, Y., Room-temperature subwavelength metallo-dielectric lasers (2010) Nature Photonics, 4, pp. 395-399. , AprKhajavikhan, M., Simic, A., Katz, M., Lee, J.H., Slutsky, B., Mizrahi, A., Lomakin, V., Fainman, Y., Thresholdless nanoscale coaxial lasers (2012) Nature, 482, pp. 204-207. , JanGu, Q., Slutsky, B., Vallini, F., Smalley, J.S.T., Nezhad, M.P., Frateschi, N.C., Fainman, Y., Purcell effect in sub-wavelength semiconductor lasers (2013) Optics Express, 21 (13), p. 15603Ning, C.Z., What is Laser Threshold (2013) IEEE Journal of Selected Topics in Quantum Electronics, 19, pp. 1503604-1503604. , MayHess, O., Pendry, J.B., Maier, S.A., Oulton, R.F., Hamm, J.M., Tsakmakidis, K.L., Active nanoplasmonic metamaterials (2012) Nature Materials, 11, pp. 573-584. , JulyDing, K., Hill, M.T., Liu, Z.C., Yin, L.J., Van Veldhoven, P.J., Ning, C.Z., Record performance of electrical injection sub-wavelength metallic-cavity semiconductor lasers at room temperature (2013) Optics Express, 21 (4), pp. 4728-4733Hobson, W.S., Mohideen, U., Pearton, S.J., Slusher, R.E., Ren, F., SiN x/sulphide passivated GaAs/AlGaAs microdisk lasers (1993) Electronics Letters, 29 (25), pp. 2199-2200Ding, K., Ning, C.Z., Metallic subwavelength-cavity semiconductor nanolasers (2012) Light: Science & Applications, 1, pp. e20. , JulyNing, C.Z., Indik, R.A., Moloney, J.V., Self-consistent approach to thermal effects in vertical-cavity surface-emitting lasers (1995) JOSA B, 12 (10), pp. 1993-2004Smalley, J.S.T., Gu, Q., Fainman, Y., Temperature dependence of the spontaneous emission factor in subwavelength semiconductor lasers (2014) IEEE Journal of Quantum Electronics, 50, pp. 175-185. , MarYu, S.F., (2003), Analysis and design of vertical cavity surface emitting lasers, Wiley - VCH, JanSchmidt, N.M., Goldberg, Y.A., (1996) Handbook Series on Semiconductor Parameters Volume 2: Ternary and Quaternary III-V Compounds, 2. , Handbook Series on Semiconductor Parameters, World Scientific, London, JanSchmidt, N.M., Goldberg, Y.A., (1996) Handbook Series on Semiconductor Parameters Volume 1: Si, Ge, C (Diamond), GaAs, GaP, GaSb, InAs, InP, InSb, 1. , Handbook Series on Semiconductor Parameters, World Scientific, London, JanZhang, P., Lau, Y.Y., Tang, W., Gomez, M.R., French, D.M., Zier, J.C., Gilgenbach, R.M., Contact resistance with dissimilar materials: Bulk contacts and thin film contacts (2011) Electrical Contacts (Holm) 2011 IEEE 57th Holm Conference, pp. 1-6. , IEEE, SeptAgrawal, G.P., Dutta, N.K., (1993) Semiconductor Lasers, , Van Nostrand Reinhold, New York, JanYoneoka, S., Lee, J., Liger, M., Yama, G., Kodama, T., Gunji, M., Provine, J., Kenny, T.W., Electrical and Thermal Conduction in Atomic Layer Deposition Nanobridges Down to 7 nm Thickness (2012) Nano Lett, 12, pp. 683-686. , FebWank, J.R., George, S.M., Weimer, A.W., Nanocoating individual cohesive boron nitride particles in a fluidized bed by ALD (2004) Powder Technology, 142, pp. 59-69. , AprDörre, E., Hübner, H., (1984) Alumina: Processing, Properties, and Applications, , Springer-Verlag, Berlin, JanKleiner, M.B., Kuhn, S.A., Weber, W., Thermal conductivity measurements of thin silicon dioxide films in integrated circuits (1996) Electron Devices, IEEE Transactions on, 43 (9), pp. 1602-1609Adachi, S., (1992) Physical Properties of III-V Semiconductor Compounds, , John Wiley & Sons, Inc., Mörlenbach, JanLange, N.A., (1999) Lange's Handbook of Chemistry, , McGraw-Hill Professional 15 ed., JanAndersson, S., Dzhavadov, L., Thermal conductivity and heat capacity of amorphous SiO2: Pressure and volume dependence (1992) Journal of Physics: Condensed Matter, 4 (29), p. 6209Lide, D.R., (2003) CRC Handbook of Chemistry and Physics, CRC Press 84 Ed., , JuneBassous, E., Fabrication of novel three-dimensional microstructures by the anisotropic etching of (100) and (110) silicon (1978) IEEE Transactions on Electron Devices, 25, pp. 1178-1185. , OctCahill, D.G., Thermal conductivity measurement from 30 to 750 K: The 3 method (1990) Review of Scientific Instruments, 6 (12), p. 802Cahill, D.G., Katiyar, M., Abelson, J.R., Thermal conductivity of alpha-Si:H thin films (1994) Physical Review B, 50 (9), p. 6077Borca-Tasciuc, T., Kumar, A.R., Chen, G., Data reduction in 3 method for thin-film thermal conductivity determination (2001) Review of Scientific Instruments, 72 (4), p. 2139Wang, R.Y., Segalman, R.A., Majumdar, A., Room temperature thermal conductance of alkanedithiol self-assembled monolayers (2006) Applied Physics Letters, 89 (17), p. 173113Majumdar, A., Scanning thermal microscopy (1999) Annual Review of Materials Science, 29 (1), pp. 505-585Kim, K., Jeong, W., Lee, W., Reddy, P., Ultra-high vacuum scanning thermalmicroscopy for nanometer resolution quantitative thermometry (2012) ACS Nano, 6, pp. 4248-4257. , MayShen, S., Henry, A., Tong, J., Zheng, R., Chen, G., Polyethylene nanofibres with very high thermal conductivities (2010) Nature Nanotechnology, pp. 1-5. , MarLiu, Z., Shainline, J.M., Fernandes, G.E., Xu, J., Chen, J., Gmachl, C.F., Continuous-wave subwavelength microdisk lasers at λ = 1.53?m (2010) Optics Express, 18, pp. 19242-19248. , AugLuo, T., Chen, G., Nanoscale heat transfer - From computation to experiment (2013) Physical Chemistry Chemical Physics, 15 (10), pp. 3389-341
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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
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