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1 Oct 2012

Volume 101, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 101, 141101 (2012); http://dx.doi.org/10.1063/1.4742864 (4 pages)

Po-Hsun Huang, Michael Ian Lapsley, Daniel Ahmed, Yuchao Chen, Lin Wang, and Tony Jun Huang
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Approaching single-photon detection in near-infrared region

Da Li, Yi Jiang, Yujie J. Ding, Ioulia B. Zotova, and Narasimha S. Prasad

Appl. Phys. Lett. 101, 141126 (2012); http://dx.doi.org/10.1063/1.4757885 (3 pages)

Online Publication Date: 5 October 2012

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We have implemented a single-photon detection system in the 1.55-μm region, based on frequency up-conversion in MgO-doped periodically poled LiNbO3 waveguide. We have subsequently reached a record-low dark count rate of 45 counts per second. The detectable signal photon rate, i.e., the rate for counting the up-converted photons corrected by the dark counts, noises, and losses, reaches a record-low value of 81 photons per second. Through free-space coupling, we have eliminated the dark counts induced by parametric fluorescence.
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42.79.Gn Optical waveguides and couplers
78.55.-m Photoluminescence, properties and materials

Two-dimensional distributed-feedback in InGaAs/GaAs quantum structure lattice arrays

K. Y. Cheng, Chien-Chia Cheng, and K. C. Hsieh

Appl. Phys. Lett. 101, 141127 (2012); http://dx.doi.org/10.1063/1.4757988 (3 pages)

Online Publication Date: 5 October 2012

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The spontaneous emission properties of an artificial semiconductor lattice—quantum structure lattice (QSL)—with in-plane two-dimensional distributed-feedback (DFB) are reported. Quantum box arrays fabricated in strained InGaAs/GaAs quantum wells are used as lattice units in the QSL. The photoluminescence (PL) peak wavelength of the QSL shows the characteristic weak temperature dependence of a DFB structure (0.024 nm/K) between 77 and 150 K. The surface emission of the QSL array shows a collimated radiation pattern. The peak PL intensity has maximum values centered within ±30° of the surface normal and dropped off beyond that angle rapidly.
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78.67.De Quantum wells
78.55.Cr III-V semiconductors

Optical super-resolution by high-index liquid-immersed microspheres

Arash Darafsheh, Gary F. Walsh, Luca Dal Negro, and Vasily N. Astratov

Appl. Phys. Lett. 101, 141128 (2012); http://dx.doi.org/10.1063/1.4757600 (4 pages) | Cited 1 time

Online Publication Date: 5 October 2012

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It is experimentally shown that barium titanate glass microspheres with diameters (D) in the range 2–220 μm and with high refractive index (n ∼ 1.9–2.1) can be used for super-resolution imaging of liquid-immersed nanostructures. Using micron-scale microspheres, we demonstrate an ability to discern the shape of a pattern with a minimum feature size of ∼λ/7, where λ is the illumination wavelength. For spheres with D > 50 μm, the discernible feature sizes were found to increase to ∼λ/4. Detailed data on the resolution, magnification, and field-of-view are presented. This imaging technique can be used in biomedical microscopy, microfluidics, and nanophotonics applications.
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78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
42.30.-d Imaging and optical processing
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