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Characterization of blue-green m-plane InGaN light emitting diodes

July 4th, 2009

You-Da Lin, Arpan Chakraborty, Stuart Brinkley, Hsun Chih Kuo, Thiago Melo et al.
High indium content blue-green (460520 nm) m-plane InGaN light emitting diodes (LEDs) were grown on low defect-density m-plane GaN substrates. Systematic studies were performed on packaged blue-green LED lamps by using a range of well and barrier thicknesses. Photoluminance and electroluminance peak … [Appl. Phys. Lett. 94, 261108 (2009)] published Wed Jul 1, 2009.

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Flexible Ge-on-polyimide detectors

July 4th, 2009

W. S. Ho, Y.-H. Dai, Y. Deng, C.-H. Lin, Y.-Y. Chen et al.
A flexible Ge-on-polyimide photodetector is demonstrated. The single crystalline thin film of Ge was transferred on the polyimide by adhesive wafer bonding and smart-cut techniques. A simple tunneling metal-oxide-semiconductor structure is fabricated for the detector applications. Due to the transpa … [Appl. Phys. Lett. 94, 261107 (2009)] published Wed Jul 1, 2009.

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Photocurrent properties of freely suspended carbon nanotubes under uniaxial strain

July 4th, 2009

S. M. Kaniber, L. Song, J. P. Kotthaus, and A. W. Holleitner
The photocurrent properties of freely suspended single-walled carbon nanotubes (CNTs) are investigated as a function of uniaxial strain. We observe that at low strain, the photocurrent signal of the CNTs increases for increasing strain, while for large strain, the signal decreases, respectively. We … [Appl. Phys. Lett. 94, 261106 (2009)] published Wed Jul 1, 2009.

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Temperature dependences of photoluminescence and electroluminescence spectra in light-emitting diodes

July 4th, 2009

Lian Li, Ping Li, Yumei Wen, Jing Wen, and Yong Zhu
The temperature influence on the luminescence characteristics of light-emitting diodes (LEDs) is investigated to reveal the connection of photoluminescence (PL) with photon absorption and electroluminescence (EL) through current injection. By inspecting the PL and EL spectra at identical injection i … [Appl. Phys. Lett. 94, 261103 (2009)] published Mon Jun 29, 2009.

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Silver halide single mode fibers for broadband middle infrared stellar interferometry

July 4th, 2009

T. Lewi, A. Tsun, A. Katzir, J. Kaster, and F. Fuchs
We report the demonstration of silver halide single mode fibers at lambda=7.5 [mu]m. The fiber’s modal behavior was tested at lambda=10.6 and lambda=7.5 [mu]m, using near field measurements. Single mode operation was observed for both wavelengths with propagation losses of ~16 and ~40 dB/m at lam … [Appl. Phys. Lett. 94, 261105 (2009)] published Mon Jun 29, 2009.

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In situ passivation and blue luminescence of silicon clusters using a cluster beam/HO codeposition production method

July 4th, 2009

A. Brewer and K. von Haeften
Si clusters are produced in a gas aggregation source and fly through ultrahigh vacuum onto a cold target where they are codeposited with water vapor. Melting of the ice yields immediately a suspension of nanoparticles that emits intense, nondegrading luminescence in the blue wavelength range. Spectr … [Appl. Phys. Lett. 94, 261102 (2009)] published Mon Jun 29, 2009.

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200 mW type I GaSb-based laser diodes operating at 3 [mu]m: Role of waveguide width

July 4th, 2009

Takashi Hosoda, Gela Kipshidze, Leon Shterengas, Sergey Suchalkin, and Gregory Belenky
Laser diodes based on AlInGaAsSb/InGaAsSb heterostructures with different waveguide widths were designed and fabricated. The decrease in the waveguide width from 1470 to 470 nm led to the improvement of the device performance. Lasers with 470 nm quinternary waveguides demonstrated 200 mW continuous … [Appl. Phys. Lett. 94, 261104 (2009)] published Mon Jun 29, 2009.

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Nonlinear optical infrared microscopy with chemical specificity

July 4th, 2009

Eun Seong Lee and Jae Yong Lee
We demonstrate a realization of nonlinear optical infrared microscopy that is capable of chemically specific imaging with high spatial resolution. It exploits the nonlinear refraction of the target material that is thermally induced by resonantly absorbed mid-infrared radiation and probed with a sho … [Appl. Phys. Lett. 94, 261101 (2009)] published Mon Jun 29, 2009.

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Beating atmospheric scintillation at millimeter and submillimeter wavelengths

July 2nd, 2009

The distorting effects of turbulence on images from a radio astronomy interferometer may be dramatically reduced by using a second instrument that monitors the atmosphere in real time.

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Beating atmospheric scintillation at millimeter and submillimeter wavelengths

July 2nd, 2009

The distorting effects of turbulence on images from a radio astronomy interferometer may be dramatically reduced by using a second instrument that monitors the atmosphere in real time.

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