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2nd International Conference on Computer Research and Development, ICCRD 2010

作者： Nazarov, Mihail Kim, Young Jin Lee, Eun Young Min, Kyoung-In Jeong, Mun Seok Lee, Su Woong Noh, Do Young Department of Materials Science and Engineering Institute of Science and Technology Gwangju Korea Republic of Department of Materials Science and Engineering Kyonggi University Suwon Korea Republic of Advanced Photonics Research Institute 1 Oryong-dong Buk-gu Gwangju Korea Republic of Department of Physics Chonbuk National University Jeonju Korea Republic of Graduate Program of Photon Science and Technology Gwangju Institute of Science and Technology Korea Republic of

ISBN: (纸本)9780769540436

Efficient phosphors based on YNbO4 and doped by Eu3+, Ga3+, Al3+ were synthesized and investigated under UV, and X-ray excitation in luminescence and Raman spectroscopy. Monoclinic fergusonite crystal structure and excellent luminescent properties under X-ray excitation allow recommend these phosphors as good candidates for different applications. © 2010 IEEE.

关键词： Luminescence

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Photonic crystal defects with increased surface area for improved refractive index sensing

Photonic crystal defects with increased surface area for imp...

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Conference on Lasers and Electro-Optics

作者： Kang, Christopher Phare, Christopher Weiss, Sharon M. Vlasov, Yurii A. Assefa, Solomon Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University 37235 United States IBM. T.J. Watson Research Center Yorktown Heights NY 10536 United States

Photonic crystal cavities with tunable surface area via multiple-hole defects were investigated for increased resonance wavelength shins upon exposure to variable-index analytes. Sensitivity was improved by 10% compar... 详细信息

ISBN: (纸本)9781557528902

关键词： Surface defects

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Photonic crystal defects with increased surface area for improved refractive index sensing

Photonic crystal defects with increased surface area for imp...

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Conference on Lasers and Electro-Optics, CLEO 2010

作者： Kang, Christopher Christopher Phare Weiss, Sharon M. Vlasov, Yurii A. Assefa, Solomon Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University Tennessee 37235 United States IBM T.J. Watson Research Center Yorktown Heights NY 10536 United States

Photonic crystal cavities with tunable surface area via multiple-hole defects were investigated for increased resonance wavelength shifts upon exposure to variable-index analytes. Sensitivity was improved by 10% compa... 详细信息

ISBN: (纸本)9781557528896

关键词： Refractive index

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M -plane (10 1- 0) InN heteroepitaxied on (100) -γ -LiAlO2 substrate: Growth orientation control and characterization of structural and optical anisotropy

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Journal of Applied physics 2010年第7期107卷

作者： Hsiao, Ching-Lien Chen, Jr-Tai Hsu, Hsu-Cheng Liao, Ying-Chieh Tseng, Po-Han Chen, Yen-Ting Feng, Zhe Chuan Tu, Li-Wei Chou, Mitch M. C. Chen, Li-Chyong Chen, Kuei-Hsien Center for Condensed Matter Sciences National Taiwan University Taipei Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei Taiwan Graduate Institute of Photonics and Optoelectronics National Taiwan University Taipei Taiwan Department of Physics and Center for Nanoscience and Nanotechnology National Sun Yat-Sen University Kaohsiung Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei Taiwan Department of Materials Science and Opto-electronic Engineering National Sun Yat-Sen University Kaohsiung Taiwan

Heteroepitaxial growth of m -plane (10 1- 0) InN film on (100) -γ -LiAlO2 (LAO) substrate has been realized by plasma-assisted molecular-beam epitaxy. Surface treatment of LAO substrate plays an important role in controlling the resultant phase and purity of m -plane InN. X-ray diffraction, reflection high-energy electron diffraction, electron back scatter diffraction, and transmission electron microscopy (TEM) studies revealed formation of pure m -plane InN film using substrate preannealed at 800 °C but without any nitridation. In contrast, using substrate with nitridation but otherwise identical pretreatment and growth conditions, c -plane (0001) InN columnar structure was grown, instead of m -plane InN film. Structural anisotropy of the m -plane InN epitaxied on LAO is attributed to the I 1 type base-plane stacking faults according to the modified Williamson-Hall and TEM analyses. A rectangular-to-rectangular atomic stacking sequence and a commensurately lattice-matched condition in epitaxial direction of [1 2- 10] InN [001] LAO with a small misfit strain of ∼0.2% are proposed to realize this heteroepitaxy. Angle-dependent polarized UV-Raman spectra showed that all the InN phonon modes follow Raman selection rule well. Strong polarization anisotropy of photoluminescence (PL) emission located at ∼0.63 eV was observed, as evidenced by a high polarization degree of 87% of the m -plane InN determined by infrared polarized PL spectroscopy. © 2010 American Institute of physics.

关键词： Aluminum nitride

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Design and fabrication of nanoscale antireflection structures with linearly graded refractive index

Design and fabrication of nanoscale antireflection structure...

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2010 10th IEEE Conference on Nanotechnology, NANO 2010

作者： Song, Young Min Jang, Sung Jun Choi, Hee Ju Yu, Jae Su Lee, Yong Tak Department of Information and Communications Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of Graduate Program of Photonics and Applied Physics Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of Department of Electronic Engineering Kyung Hee University 1 Seocheon-dong Giheung-gu Yongin-si Gyeonggi-do 446-701 Korea Republic of Department of Nanobio Materials and Electronics Gwangju Institute of Science and Technology 1 Oryong-dong Buk-gu Gwangju 500-712 Korea Republic of

ISBN: (纸本)9781424470334

We demonstrate nanoscale antireflection structures on GaAs substrate with linearly graded effective refractive index using a lenslike shape transfer for broadband light-absorbing device application. From reflectance calculation of cone- and parabola-shaped subwavelength grating (SWG) structures, it is found that the parabola shaped structures has lower mean reflectance compared to that of the cone shaped structures over a wide wavelength range. The fabricated SWG structures with parabola shape show the reflectance of below 5 % in a 300-1200 nm wavelength range. ©2010 IEEE.

关键词： Reflection

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Front Cover: Catalyst-free growth of InN nanorods by metal-organic chemical vapor deposition (Phys. Status Solidi A 1/2012)

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physica status solidi (a) 2011年第1期209卷

作者： Min Hwa Kim Dae Young Moon Jinsub Park Yasushi Nanishi Gyu-Chul Yi Euijoon Yoon Hybrid Materials Program (WCU) Department of Materials Science and Engineering Seoul National University Seoul 151-744 Korea Department of Electronic Engineering Hanyang University Seoul 133-791 Korea Department of Photonics Ritsumeikan University Shiga 525-8577 Japan National Creative Research Initiative Center for Semiconductor Nanorods Department of Physics and Astronomy Seoul National University Seoul 151-747 Korea Euijoon Yoon Phone: +82 2 880 2651 Fax: +82 2 6008 3712 Department of Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Suwon 443-270 Korea Energy Semiconductor Research Center Advanced Institute of Convergence Technology Seoul National University Suwon 443-270 Korea Gyu-Chul Yi Phone: +82 2 880 7169 Fax: +82 2 884 3002

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Reconstruction and evaporation at graphene nanoribbon edges

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Physical Review B 2010年第19期81卷 195419-195419页

作者： Gun-Do Lee C. Z. Wang Euijoon Yoon Nong-Moon Hwang K. M. Ho Department of Materials Science and Engineering Seoul National University Seoul 151-742 Korea Ames Laboratory and Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA Department of Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Suwon 433-270 Korea WCU Hybrid Materials Program Department of Materials Science and Engineering Seoul National University Seoul 151-742 Korea National Research Laboratory of Charged Nanoparticles Seoul National University Seoul 151-742 Korea

The reconstruction and evaporation at graphene nanoribbon (GNR) edges are investigated by tight-binding molecular-dynamics simulations and ab initio calculations. It is observed that reconstruction through the formation of pentagon-heptagon pairs can take place quickly along the zigzag edge and it is energetically favorable. At very high temperatures, the armchair edge is found to change into a zigzag edge structure, which further accelerates the evaporation of carbon atoms and leads to the formation of carbon linear chains. The evaporation of carbon atoms from both the zigzag and armchair edges is preceded by the formation of heptagon rings, which serve as a gateway for carbon atoms to escape. In the simulation for a GNR armchair-zigzag-armchair junction, carbon atoms are evaporated row by row from the outermost row of the zigzag edge while the armchair edge remains nearly intact. These results can be applied to nanoelectronic devices fabrication through the temperature-controlled edge structure of GNR.

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T-shaped plasmonic array as a narrow-band thermal emitter or biosensor

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Optics Express 2009年第16期17卷 13526-13531页

作者： Wang, Chih-Ming Chang, Yia-Chung Abbas, Mohammed Nadhim Shih, Ming-Hsiung Tsai, Din Ping Research Center for Applied Sciences Academia Sinica Taipei 11529 Taiwan Institute of Physics and Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 115 Taiwan Department of Engineering and System Science NTHU Hsinchu 300 Taiwan Department of Physics National Taiwan University Taipei 106 Taiwan

A T-shaped plasmonic array is proposed for application as an effective thermal emitter or biosensor. The reflection and thermal radiation properties of a T-shaped array are investigated theoretically. The angular dependent reflectance spectrum shows a clear resonant dip at 0.36eV for full polar angles. No other significant localized resonant mode is found in the investigated spectral range from 0.12eV to 0.64eV. According to the Kirchhoff s law, the thermal radiation of the proposed structure can lead to a sharp peak at 3.5 νm with low sideband emission. We have also found that the T-shaped structure filled with organic material such as PMMA with different thicknesses (10 nm -50 nm) can lead to significant shift of the resonance wavelength. Thus, the T-shaped structure can also be used as a good sensor for organic materials. © 2009 Optical Society of America.

关键词： Heat radiation

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Numerical simulation of water circulation in a cylindrical horizontal thermal tank

Numerical simulation of water circulation in a cylindrical h...

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Southern Conference on Computational Modeling

作者： Savicki, Darci Luiz Vielmo, Horácio A. IMEF -Institute of Mathematics Statistics and Physics FURG - Federal University of Rio Grande Rio Grande Brazil PROMEC - Mechanical Engineering Graduate Program UFRGS - Federal University of Rio Grande do Sul Porto Alegre Brazil

ISBN: (纸本)9780769539768

It is carried out a numerical study of the three-dimensional temperature and velocity fields in a cylindrical horizontal thermal tank during the process of water circulation. The numerical simulations were made using an academic Finite Volumes numerical code. This simulation considers that the thermal tank is connected to solar collectors. So, in the tank, the inlet jet temperature is higher than those inside the tank. This study aims to investigate the influence of the inlet jet on thermal stratification. The results show that for the mass flow rate studied, there is no significant variation on thermal stratification © 2009 IEEE.

关键词： Solar energy

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Attenuation artifacts and time-of-flight PET

Attenuation artifacts and time-of-flight PET

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Timothy G. Turkington Joshua M. Wilson Departments of Radiology and Biomedical Engineering and the Graduate Program in Medical Physic Duke university Durham NC USA Graduate Program in Medical Physics Duke university Durham NC USA

Attenuation artifacts in PET are seen when attenuation correction (AC) is not performed and when AC is performed but is based on an incorrect attenuation map. PET attenuation artifacts are generally more profound than the straightforward differences in photon attenuation through surrounding tissue from one source location to another. Effects such as the apparent radioactivity in gas pockets in the body or concave contours of the body surface, distortions, and a pronounced body contour are all in addition to the expected nonuniformities due to depth in the body. We have investigated the effects of time-of-flight (TOF) reconstruction on PET artifacts. Uniformity without AC (NAC) was investigated in a large tapering F-18-fillled phantom that increases from a small end to the size of a large patient. Throughout the length of the phantom, the NAC images with TOF were more uniform that the non-TOF images. A whole-body phantom with oval cross section was imaged with uniform F-18 background and a 5.5 cm air-filled sphere at one section, and a 5.5 cm hot (8? background) sphere at another section. In NAC images, the air-filled lesion was artificially hotter than background with non-TOF, but comparable to background with TOF. When this section was corrected with a uniform AC (as if the gas pocket had moved before transmission scan), the non-TOF image showed the sphere to be artificially hot (hotter than background) whereas the TOF images reduced the artifact. In the section with the hot sphere, the NAC distortions typical near the bladder (higher counts anterior and posterior to bladder; depleted areas lateral to bladder) were greatly diminished with TOF images. While AC is necessary for quantitation in PET, the use of TOF and NAC may be useful in providing more interpretable images in some situations were an attenuation map is impossible to obtain, or introduces errors of its own. TOF may also lessen some artifacts in corrected images.

关键词： Attenuation Positron emission tomography Imaging phantoms Image reconstruction Bladder Filling Biomedical imaging physics Telephony Electronic mail

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