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245 results on '"Wahlbrink, T."'

1. Mobility in Graphene Double Gate Field Effect Transistors

Author

Lemme, M. C., Echtermeyer, T. J., Baus, M., Szafranek, B. N., Bolten, J., Schmidt, M., Wahlbrink, T., and Kurz, H.

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

In this work, double-gated field effect transistors manufactured from monolayer graphene are investigated. Conventional top-down CMOS-compatible processes are applied except for graphene deposition by manual exfoliation. Carrier mobilities in single- and double gated graphene field effect transistors are compared. Even in double-gated graphene FETs, the carrier mobility exceeds the universal mobility of silicon over nearly the entire measured range. At comparable dimensions, reported mobilities for ultra thin body silicon-on-insulator MOSFETs can not compete with graphene FET values., Comment: 7 pages, 9 figures

Published
2008
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4. Observation of magnetic order in La_{1.9}Sr_{0.1}CuO_{4} from two-magnon Raman scattering

Author

Lin, Y., Sichelschmidt, J., Eldridge, J. E., Wahlbrink, T., and Cheong, S. -W.

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons
Abstract

We reported two-magnon Raman scattering from La_{1.9}Sr_{0.1}CuO_4, which has a suppressed Tc=12 K, as the temperature is lowered below 37 K and an ordered spin phase is formed. The two-magnon Raman intensity increases with decreasing temperature. The magnetic scattering in La_{1.9}Sr_{0.1}CuO_4 is totally different from that reported in the parent compound La_2CuO_4. We analyze the line shape of the two-magnon scattering within the traditional Loudon-Fleury theory and find the superexchange constant J=1052 cm^{-1}. The calculation of the frequency moment suggests that the quantum fluctuations are very weak in the system. The room temperature Raman scattering from La_2CuO_4 is also measured. Strong features appear in the one-phonon spectrum at the frequencies of the longitudinal optical (LO) infrared modes which we suggest become Raman active through a Fr\"{o}hlich-interaction., Comment: 6 pages, 4 eps figures, submitted to PRB

Published
1998

28. Influence of Zn/In codoping on the optical properties of lithium niobate

Author

Karemir, K., Betzler, K., Matzas, B., Tiegel, B., Wahlbrink, T., Wohlecke, M., Gather, B., Rubinina, N., and Volk, T.

Subjects
Lithium alloys -- Research, Semiconductor doping -- Research, Physics
Abstract

The effects of combining the dopants Zn and In on the optical properties of lithium niobate (LiNbO3) are studied. It is shown that codoping does not provide complete control over refractive indices or the noncritical colinear phase matching temperature. However, codoping can be used to enhance the optical properties of LiNbO3. The use of the Sellmeier equation to determine the linear and nonlinear optical properties of LiNbO3 is discussed.

Published
1998

29. Efficient Metal-Halide Perovskite Micro Disc Lasers Integrated in a Silicon Nitride Photonic Platform

Author

Cegielski, P. J., primary, Neutzner, S., additional, Porschatis, C., additional, Gandini, M., additional, Schall, D., additional, Perini, C. A.R., additional, Bolten, J., additional, Suckow, S., additional, Chmielak, B., additional, Petrozza, A., additional, Wahlbrink, T., additional, Lemme, M. C., additional, and Giesecke, A. L., additional

Published
2018
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32. Generation of 64 GBd 4ASK signals using a silicon-organic hybrid modulator at 80°C

Author

Lauermann, M., Wolf, S., Hartmann, W., Palmer, R., Kutuvantavida, Y., Zwickel, H., Bielik, A., Altenhain, L., Lutz, J., Schmid, R., Wahlbrink, T., Bolten, J., Giesecke, A. L., Freude, W., and Koos, C.

Subjects
ddc:620, Engineering & allied operations
Abstract

We demonstrate a silicon-organic hybrid (SOH) Mach-Zehnder modulator (MZM) generating four-level amplitude shift keying (4ASK) signals at symbol rates of up to 64 GBd both at room temperature and at an elevated temperature of 80°C. The measured line rate of 128 Gbit/s corresponds to the highest value demonstrated for silicon-based MZM so far. We report bit error ratios of 10−10 (64 GBd BPSK), 10−5 (36 GBd 4ASK), and 4 × 10−3 (64 GBd 4ASK) at room temperature. At 80 °C, the respective bit error ratios are 10−10, 10−4, and 1.3 × 10−2. The high-temperature experiments were performed in regular oxygen-rich ambient atmosphere.

Published
2016
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34. Characterization of CMOS metal based dielectric loaded surface plasmon waveguides at telecom wavelengths

Author

Weeber, J.-C., primary, Arocas, J., additional, Heintz, O., additional, Markey, L., additional, Viarbitskaya, S., additional, Colas-des-Francs, G., additional, Hammani, K., additional, Dereux, A., additional, Hoessbacher, C., additional, Koch, U., additional, Leuthold, J., additional, Rohracher, K., additional, Giesecke, A. L., additional, Porschatis, C., additional, Wahlbrink, T., additional, Chmielak, B., additional, Pleros, N., additional, and Tsiokos, D., additional

Published
2017
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36. Silicon-organic hybrid (SOH) integration and photonic multi-chip systems: Technologies for high-speed optical interconnects

Author

Koos, C., primary, Freude, W., additional, Leuthold, J., additional, Dalton, L. R., additional, Wolf, S., additional, Zwickel, H., additional, Hoose, T., additional, Billah, M. R., additional, Lauermann, M., additional, Weimann, C., additional, Hartmann, W., additional, Melikyan, A., additional, Lindenmann, N., additional, Koeber, S., additional, Palmer, R., additional, Korn, D., additional, Alloatti, L., additional, Giesecke, A.-L., additional, and Wahlbrink, T., additional

Published
2016
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37. Low-power silicon-organic hybrid (SOH) modulators for advanced modulation formats

Author

Lauermann, M., Palmer, R., Koeber, S., Schindler, P. C., Korn, D., Wahlbrink, T., Bolten, J., Waldow, M., Elder, D. L., Dalton, L. R., Leuthold, J., Freude, W., and Koos, C.

Subjects
ddc:620, Engineering & allied operations
Abstract

We demonstrate silicon-organic hybrid (SOH) electro-optic modulators that enable quadrature phase-shift keying (QPSK) and 16-state quadrature amplitude modulation (16QAM) with high signal quality and record-low energy consumption. SOH integration combines highly efficient electro-optic organic materials with conventional silicon-on-insulator (SOI) slot waveguides, and allows to overcome the intrinsic limitations of silicon as an optical integration platform. We demonstrate QPSK and 16QAM signaling at symbol rates of 28 GBd with peak-to-peak drive voltages of 0.6 Vpp. For the 16QAM experiment at 112 Gbit/s, we measure a bit error ratio of 5.1 × 10-5 and a record-low energy consumption of only 19 fJ/bit.

Published
2014

40. 16×1 Dual Polarization SOI MUX/DEMUX for Flexible-Grid Optical Networks

Author

Kanakis, G., primary, Iliadis, N., additional, Argyris, N., additional, Goetz, G., additional, Dede, A., additional, Poulopoulos, G., additional, Kalavrouziotis, D., additional, Bolten, J., additional, Lazarou, I., additional, Wahlbrink, T., additional, Giesecke, A. L., additional, Vanucci, A., additional, Apostolopoulos, D., additional, and Avramopoulos, H., additional

Published
2016
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41. Silicon-organic hybrid (SOH) integration and photonic multi-chip systems: Extending the capabilities of the silicon photonic platform

Author

Koos, C., primary, Freude, W., additional, Leuthold, J., additional, Kohl, M., additional, Dalton, L. R., additional, Bogaerts, W., additional, Lauermann, M., additional, Wolf, S., additional, Weimann, C., additional, Melikyan, A., additional, Lindenmann, N., additional, Billah, M. R., additional, Muehlbrandt, S., additional, Koeber, S., additional, Palmer, R., additional, Koehnle, K., additional, Alloatti, L., additional, Elder, D. L., additional, Giesecke, A.-L, additional, and Wahlbrink, T., additional

Published
2015
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42. Silicon-organic hybrid (SOH) integration for low-power and high-speed signal generation

Author

Koos, C., primary, Freude, W., additional, Leuthold, J., additional, Kohl, M., additional, Dalton, L. R., additional, Bogaerts, W., additional, Lauermann, M., additional, Wolf, S., additional, Palmer, R., additional, Koeber, S., additional, Melikyan, A., additional, Weimann, C., additional, Ronniger, G., additional, Geistert, K., additional, Schindler, P. C., additional, Elder, D. L., additional, Wahlbrink, T., additional, Bolten, J., additional, Giesecke, A. L., additional, Koenigsmann, M., additional, Kohler, M., additional, and Malsam, D., additional

Published
2015
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45. High-speed and low-power silicon-organic hybrid modulators for advanced modulation formats

Author

Lauermann, M., additional, Wolf, S., additional, Palmer, R., additional, Koeber, S., additional, Schindler, P. C., additional, Wahlbrink, T., additional, Bolten, J., additional, Giesecke, A. L., additional, Koenigsmann, M., additional, Kohler, M., additional, Malsam, D., additional, Elder, D. L., additional, Dalton, L. R., additional, Leuthold, J., additional, Freude, W., additional, and Koos, C., additional

Published
2015
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46. All-optical wavelength conversion at 160Gb/s using an SOA and a 3rd order SOI nanowire periodic filter

Author

Stamatiadis, C, Vyrsokinos, K, Stampoulidis, L, Maziotis, A, Sheng, Z, Van Thourhout, Dries, Bolten, J, Karl, M, Wahlbrink, T, and Avramopoulos, H

Subjects
Social Sciences
Abstract

We present 160Gb/s all-optical wavelength conversion using an SOA and a 3rd order racetrack resonator integrated on a SOI nanowire platform. The scheme requires 0.5W of electrical power and the power penalty is < 3 dB.

Published
2010

47. Silicon-Organic Hybrid (SOH) and Plasmonic-Organic Hybrid (POH) Integration

Author

Koos, C., primary, Leuthold, J., additional, Freude, W., additional, Kohl, M., additional, Dalton, L. R., additional, Bogaerts, W., additional, Giesecke, A.-L., additional, Lauermann, M., additional, Melikyan, A., additional, Koeber, S., additional, Wolf, S., additional, Weimann, C., additional, Muehlbrandt, S., additional, Koehnle, K., additional, Pfeifle, J., additional, Palmer, R., additional, Korn, D., additional, Alloatti, L., additional, Elder, D. L., additional, Wahlbrink, T., additional, and Bolten, J., additional

Published
2015
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50. 40 GBd 16QAM modulation at 160 Gbit/s in a silicon-organic hybrid (SOH) modulator

Author

Lauermann, M., primary, Schindler, P. C., additional, Wolf, S., additional, Palmer, R., additional, Koeber, S., additional, Korn, D., additional, Alloatti, L., additional, Wahlbrink, T., additional, Bolten, J., additional, Waldow, M., additional, Koenigsmann, M., additional, Kohler, M., additional, Malsam, D., additional, Elder, D. L., additional, Johnston, P. V., additional, Phillips-Sylvain, N., additional, Sullivan, P. A., additional, Dalton, L. R., additional, Leuthold, J., additional, Freude, W., additional, and Koos, C., additional

Published
2014
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