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

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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Single molecule tug-of-war and confinment-induced entropic recoiling of DNA in nanoslits

Single molecule tug-of-war and confinment-induced entropic r...

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13th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2009

作者： Yeh, Jia-Wei Taloni, Alessandro Shen, Jie-Pan Chen, Yeng-Long Chou, Chia-Fu Department of Physics National Taiwan University Taipei Taiwan Institute of Physics Taiwan International Graduate Program Academia Sinica Taipei Taiwan Research Center for Applied Sciences Taiwan International Graduate Program Academia Sinica Taipei Taiwan Genomics Research Center Taiwan International Graduate Program Academia Sinica Taipei Taiwan Nano Science and Technology Taiwan International Graduate Program Academia Sinica Taipei Taiwan

ISBN: (纸本)9780979806421

Single DNA molecules confined in micro- and nanochannels have been studied for its tug-of-war behavior and confinement-induced entropic recoiling under different nanoslit lengths (2, 3, 4, 10, and 20 μm) and 50 nm in depth. From a scaling analysis, we confirmed that the entropic force is independent of polymer length inside the nanoslit. We present a model for stretched-recoiling process at the micronano interface. For DNA retracting process, the force over drag coefficient per unit length f/ρ was found to be 13.4±0.6 μm2/sec. © 2009 CBMS.

关键词： DNA

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Real-time data acquisition incorporating high-speed software correlator for single-molecule spectroscopy

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Journal of Microscopy 2009年第3期234卷 302-310页

作者： Yang, L.-L. Lee, H.-Y. Wang, M.-K. Lin, X.-Y. Hsu, K.-H. Chang, Y.-R. Fann, W. White, J.D. Department of Physics National Taiwan University Taipei Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei Taiwan Department of Electrical Engineering Yuan Ze University Taoyuan Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei Taiwan

Summary Single-molecule spectroscopy and detection are powerful techniques for the study of single fluorescent particles and their interaction with their environment. We present a low-cost system for simultaneous real-time acquisition, storage of inter-photon arrival times and the calculation and display of the fluorescence time trace, autocorrelation function and distribution of delays histogram for single-molecule experiments. From a hardware perspective, in addition to a multi-core computer, only a standard low-cost counting board is required as processing is software-based. Software is written in a parallel programming environment with time crucial operations coded in ANSI-C. Crucial to system performance is a simple and efficient real-time autocorrelation algorithm (acf) optimized for the count rates (approximately 104 cps) encountered in single-molecule experiments. The algorithm's time complexity is independent of temporal resolution, which is maintained at all time delays. The system and algorithm's performance was validated by duplicating the signal from the photon detector and sending it to both the ordinary counter board and a commercial correlator simultaneously. The data acquisition system's robustness under typical single-molecule experimental conditions was tested by observing the diffusion of Rhodamine 6G molecules in deionized water. © 2009 The Royal Microscopical Society.

关键词： Fluorescence

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Dielectric constant at x -band microwave frequencies for multiferroic BiFeO3 thin films

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Journal of Applied Physics 2009年第7期105卷

作者： Abdul Ahad, Faris B. Hung, D.S. Yao, Y.D. Lee, S.F. Tu, C.S. Wang, T.H. Chen, Y.Y. Fu, Y.P. 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 Information and Telecommunication Engineering Ming Chuan University Taipei 111 Taiwan Department of Materials Engineering Tatung University Taipei 104 Taiwan Department of Graduate Institute of Applied Science and Engineering Fu Jen University Taipei 242 Taiwan Department of Materials Science and Engineering National Dong Hwa University Hualien 974 Taiwan

The magnetic-induced dielectric responses of BiFeO3 (BFO) thin films were measured at the X -band microwave frequency ranged from 7 to 12.5 GHz. The measurement was given initially by a high-precision cavity microwave resonator without magnetic field. Both the real and imaginary parts of the permittivity showed its dielectric property as a function of the measuring frequency. The X -band dielectric responses of the BFO thin film were then measured by a controlled magnetic field at room temperature. The data demonstrated up to 2.2% dielectric tunability by using only 3.46 kOe magnetic field at TE107 mode (9.97705 GHz). © 2009 American Institute of Physics.

关键词： Magnetic fields

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Electronic properties of low-dimensional nano-structures

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Journal of the Vacuum Society of Japan 2008年第7期51卷 421-422页

作者： Aoyagi, Yoshinobu Ritsumelkan University 1-1-1 Noji-Higashi Kusatsu-shi Shiga 525-8577 Japan Tokyo Institute of Technology Interdisciplinary Graduate School of Science and Engineering 4259 Nagatsuda Midori-ku Yokohama 226-8502 Japan Nano Science Joint Research Program Nano Science Technology Development and Support Team 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan

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Integral videography autostereoscopic display using multiprojection

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Systems and Computers in Japan 2006年第5期37卷 34-45页

作者： Liao, Hongen Iwahara, Makoto Koike, Takefumi Momoi, Yasuyuki Hata, Nobuhiko Sakuma, Ichiro Dohi, Takeyoshi Graduate School of Engineering University of Tokyo Tokyo 113-8656 Japan Z-axis Ltd. Japan Hitachi Ltd. Tokyo 101-8010 Japan Graduate School of Frontier Sciences University of Tokyo Tokyo 113-8656 Japan Graduate School of Information Science and Technology University of Tokyo Tokyo 113-8656 Japan Nano Bioengineering Education Program Graduate School of Engineering University of Tokyo Z-axis Ltd. Systems Development Laboratory Hitachi Ltd. Graduate School of Information Science and Technology University of Tokyo Institute of Environmental Studies Graduate School of Frontier Sciences University of Tokyo

Various techniques of autostereoscopic three-dimensional (3D) display for displaying real 3D information have been investigated in recent years. We have performed research and application of integral videography (IV), which is an animated display technique based on the principle of integral photography (IP). Although IV and IP are ideal ways to display 3D images, their spatial viewing resolution and high-speed image rendering algorithm must be improved. The pixel pitch of the display and the lens pitch are the main factors affecting IV image quality. We improved the image quality by increasing the number and density of the pixels. Parallel image processing and displaying method were also developed for animated IV imaging. We have created a scalable high-resolution image using multiple projection and project it onto a small screen to achieve high-density pixels using long-focal-length projection optics. Furthermore, an image calibration method was developed for geometrical correction and color modulation to generate seamless IV images. We evaluated the developed device by displaying an X-ray computed tomography (CT) image. Measurement of the geometrical accuracy of the reproduced IV images demonstrated that the spatial resolution of the display system matched that by theoretical analysis. Experimental results showed that our technique is very effective in obtaining 3D animated images with practical spatial resolution. © 2006 Wiley Periodicals, Inc.

关键词： Display devices

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