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20 Feb 2012

Volume 100, Issue 8, Articles (08xxxx)

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Appl. Phys. Lett. 100, 082401 (2012); http://dx.doi.org/10.1063/1.3684972 (4 pages)

Elizabeth Rapoport and Geoffrey S. D. Beach
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Near-resonant two-photon absorption in luminescent CdTe quantum dots

Jayakrishna Khatei, C. S. Suchand Sandeep, Reji Philip, and K. S. R. Koteswara Rao

Appl. Phys. Lett. 100, 081901 (2012); http://dx.doi.org/10.1063/1.3687695 (3 pages)

Online Publication Date: 21 February 2012

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We report the nonlinear optical absorption studies in two differently sized water-soluble cadmium telluride quantum dot (QD) samples, exhibiting first excitonic absorption peaks at 493 nm and 551 nm, respectively. An optical limiting behavior is observed for near-resonant excitation at 532 nm using nanosecond laser pulses, originating from the effective two-photon absorption (TPA) mechanism. The effective TPA coefficient (βeff) is measured to be in the range of 10−12 m/W. This is one order of magnitude higher than the TPA coefficient (β) reported for off-resonant excitation. At this excitation wavelength, the smaller QD shows a relatively weaker photoluminescence and stronger nonlinear absorption.
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78.67.Hc Quantum dots
78.55.Et II-VI semiconductors

Stimulated emission in AlGaN/AlGaN quantum wells with different Al content

J. Mickevičius, J. Jurkevičius, K. Kazlauskas, A. Žukauskas, G. Tamulaitis, M. S. Shur, M. Shatalov, J. Yang, and R. Gaska

Appl. Phys. Lett. 100, 081902 (2012); http://dx.doi.org/10.1063/1.3688051 (4 pages) | Cited 4 times

Online Publication Date: 21 February 2012

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Stimulated emission (SE) is studied in AlGaN/AlGaN multiple quantum wells (MQWs) with different Al content grown on sapphire substrate. The spectra of spontaneous and stimulated emission and their transformations with increasing temperature as well as stimulated emission thresholds were measured in the temperature range from 8 to 300 K. Phonon-assisted band broadening in low-Al-content MQWs and double-scaled potential profile in high-Al-content MQWs were observed in the samples and linked with carrier localization conditions. The temperature dependence of the stimulated emission threshold was similar in the samples where the stimulated transitions occur between extended states and in the samples where the transitions occur in localized states. The stimulated emission threshold depends predominantly on the density of nonradiative recombination centers.
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78.45.+h Stimulated emission
78.67.De Quantum wells

Micro-fabricated channel with ultra-thin yet ultra-strong windows enables electron microscopy under 4-bar pressure

Tuncay Alan, Tadahiro Yokosawa, João Gaspar, Gregory Pandraud, Oliver Paul, Fredrik Creemer, Pasqualina M. Sarro, and Henny W. Zandbergen

Appl. Phys. Lett. 100, 081903 (2012); http://dx.doi.org/10.1063/1.3688490 (4 pages) | Cited 1 time

Online Publication Date: 23 February 2012

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Transmission electron microscopy (TEM) of (de-)hydrogenation reactions is crucial to characterize efficiency of hydrogen storage materials. The nanoreactor, a micromachined channel with 15-nm-thick windows, effectively confines the gas flow to an electron-transparent chamber during TEM of reactions. Realistic experiments require very high pressures to be sustained by the device. Nanomechanical bulge tests and simulations show that due to a very strong size effect, ultra-thin device components can reliably withstand tensile stresses as high as 19.5 GPa enabling high pressure operation. We use the device to characterize Pd particles under a 4-bar H2 pressure within the ultra-high-vacuum of the TEM.
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85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
07.10.Cm Micromechanical devices and systems

Non-resonant femtosecond laser control of the molecular dynamics in liquid chloroform

V. G. Nikiforov, A. G. Shmelev, G. M. Safiullin, and V. S. Lobkov

Appl. Phys. Lett. 100, 081904 (2012); http://dx.doi.org/10.1063/1.3689776 (4 pages) | Cited 1 time

Online Publication Date: 23 February 2012

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The optical control of the molecular motions in chloroform CHCl3 at room temperature through the non-resonant excitation was enhanced by means of the double-pulse pump-probe technique. When the separation time of the pump pulses and their relative intensity were varied, the amplification or the cancellation of the coherent vibrations of the molecules was achieved. The molecular responses were detected by the time-resolved optically heterodyne-detected optical-Kerr-effect technique.
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78.47.D- Time resolved spectroscopy (>1 psec)
61.20.Ja Computer simulation of liquid structure
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
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