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Antennas and Propagation Society International Symposium

作者： Abdulkadir C. Yücel Hakan Bağci Eric Michielssen Department of Electrical Engineering and Computer Science University of Michigan at Ann Arbor Ann Arbor MI USA Division of Physical Sciences and Engineering King Abdullah University of Science and Technology Thuwal Thuwal KSA

In this paper, an h-adaptive SC-gPC method suited for characterizing rapidly varying and/or discontinuous observables is presented. The proposed extension achieves its efficiency by recursively and adaptively dividing the random domain into sub-domains based on the decay rates of observables' local variances, and constructing separate gPC expansions for each sub-domain. The adaptive SC-gPC method enables the stochastic characterization of electronic systems that involve high-Q resonators and highly non-linear components with discontinuous responses (e.g., rectifier circuits). Due to these systems' high sensitivity to perturbations in excitation or geometry, their stochastic characterization would be impossible using "classical" SC methods without the proposed h-adaptive extension.

关键词： Electromagnetic interference Electromagnetic compatibility Tensile stress RLC circuits Polynomials Random variables Adaptation model

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Parallel DNA Synthesis in microreactors with optical manipulation

Parallel DNA Synthesis in microreactors with optical manipul...

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7th Annual Conference on Foundations of Nanoscience: Self-Assembled Architectures and Devices, FNANO 2010

作者： Wang, Tao Oehrlein, Stefan Somoza, Mark Kershner, Ryan Cerrina, Franco Center for Nanotechnology University of Wisconsin-Madison Madison WI 53706 United States Materials Science Program University of Wisconsin-Madison Madison WI 53706 United States Department of Mechanical Engineering University of Wisconsin-Madison Madison WI 53706 United States Department of Electrical and Computer Engineering University of Wisconsin-Madison Madison WI 53706 United States Department of Electrical and Computer Engineering Boston University Boston MA 02215. United States Center for Nano Science and Technology Department of Electrical Engineering University of Notre Dame Notre Dame IN 46556 United States Physical Chemistry of Biopolymers Fakultät für Chemie Universität Wien A-1090 Wien Austria

We developed an optical tweezers directed approach that allows synthesis of different oligonucleotide on an array of controlled pore glass (CPG) beads in parallel in a two-stream laminar flow microreactor and obtained one oligo sequence per bead. This reactor has been shown to effectively facilitate CPG bead loading and confinement, maintain liquid/ liquid (inert liquid/reagent) interface and withstand the reagents and solvents present in the modified phosphoramidite chemistry. The optical tweezers allows us to externally manipulate the CPG beads inside the channel without having to modify the microfluidic device itself. The parallel synthesis of several different oligonucleotides in a single synthetic run was demonstrated.

关键词： Oligonucleotides

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Time-domain analysis of surface-plasmon-polariton propagation in Ag nano-films using a generalized polarization approach

Time-domain analysis of surface-plasmon-polariton propagatio...

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IEEE PhotonicsGlobal@Singapore, IPGC

作者： A. A. Al-Jabr M. A. Alsunaidi Division of Physical Sciences and Engineering King Abdullah University for Science and Technology Thuwal Saudi Arabia Department of Electrical Engineering King Fahd University of Petroleum and Minerals Dhahran Saudi Arabia

A time-domain analysis of the propagation properties of surface-plasmon-polaritons (SPP) in Silver nanostructures is presented. The analysis is based on a simulation algorithm that unifies the formulation of different dispersion models and multi-pole relations into one form. The main objective of this work is to perform a comparative analysis between different dispersion models used for Silver, including Debye, Drude and multi-pole Lorentz-Drude models. The quantities that are used in the comparison are the SPP propagation length and propagation speed. Experimental results reported in literature are used to support the conclusions.

关键词： Dispersion Mathematical model Time domain analysis Algorithm design and analysis Finite difference methods Analytical models Optical waveguides

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Enhanced Raman Scattering of Silicon Nanowires by Ag Nanoparticles in‐situ Decoration

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AIP Conference Proceedings 2010年第1期1267卷 53-54页

作者： Zeping Peng Hailong Hu Shijie Wang Zexiang Shen Qihua Xiong aSchool of Physical and Mathematical Sciences Division of Physics and Applied Physics Nanyang Technological University Singapore 637371 bInstitute of Materials Research and Engineering Agency for Science Technologies and Research Singapore 117602 cSchool of Electrical and Electronic Engineering Division of Microelectronics Nanyang Technological University Singapore 639798

Recently, metallic nanoparticles decorated semiconductor nanowires, especially silicon, attract considerable attention, due to their potential applications in photocatalysis, photovoltaics, surface enhanced Raman scattering and biosensing. A common method that has been used to decorate silicon nanowires with metallic nanoparticles, e.g. Au or Pt, is galvanic displacement, in which metallic ions are reduced with electrons supplied by virtue of silicon half‐cell reaction. Here we report a method to decorate silicon nanowires with Ag nanoparticles by surface reduction, in which a freshly etched silicon surface reduces Ag ions in‐situ in aqueous silver nitrate solution. The as‐grown Ag nanoparticles exhibit either highly single crystallinity or twinning boundaries, with most probably diameter ∼25 nm (Figure 1). Raman mapping experiments suggest that 1st order Raman band of silicon nanowires exhibit uniform contrast along wire axis for pristine silicon nanowires, while for Ag nanoparticle decorated silicon nanowires a series of “hot‐spot,” i.e., substantially enhanced Raman scattering were discovered along the wire axis. This was explained by local electric field enhancement due to Ag nanoparticle “nano‐antenna,” which was supported by the correlation between atomic force microscopy (AFM) analysis and Raman mapping (Figure 2). The enhancement is more or less delocalized in Raman mapping due to diffraction limit in our far‐field mapping experiments. In addition, we also noticed a new side band feature ∼495 cm−1 for nanowires appeared after HF etching, this new feature sustained after sequential Oxygen plasma and UV/ozone treatment which excluded the possibility due to any possible surface dangling bonds. We now suspect this feature is due to porosity resulted from HF etching and it is now being subjected to further investigations.

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The effects of rapid annealing and passivation of co-sputtered erbium doped Si-rich oxide/SiO2 superlattice structures

The effects of rapid annealing and passivation of co-sputter...

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2010 Photonics Global Conference, PGC 2010

作者： Silalahi, Samson T.H. Chen, Rui Vu, Q.V. Pita, K. Sun, H.D. Yu, M.B. Photonics Research Centre School of Electrical and Electronic Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore NanoElectronics and Photonics Institute of Microelectronics Singapore 11 Science Park Road Singapore 117685 Singapore

ISBN: (纸本)9781424498826

Erbium doped Si-rich oxide/SiO2 (Er:SRO/SiO2) superlattice structures have been deposited using rf magnetron co-sputtering technique. Rapid annealing treatment with and without passivation (annealing in 5%H2:N2 at 500°C for 1 hour) were carried out. The optimum annealing temperature for un-passivated and passivated samples is 850°C and 1000°C, respectively. Excitation mechanism of Er is through defects or excitons. Passivation enhanced the Si nanocrystals-mediated-Er photoluminescence (PL) at 1.55 μm quenching the competing non-radiative recombination centers. The passivation also quenched the defect-mediated Er emission. The PL peak intensity of Er emission varied with Si nanocrystal size and the optimum size is ∼3.5 nm.

关键词： Passivation

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Polar vs. nonpolar InGaN/GaN quantum heterostructures: Opposite quantum confined electroabsorption and carrier dynamics behavior

Polar vs. nonpolar InGaN/GaN quantum heterostructures: Oppos...

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2010 Photonics Global Conference, PGC 2010

作者： Sari, Emre Nizamoglu, Sedat Choi, Jung Hun Lee, Seung Jae Baik, Kwang Hyeon Lee, In Hwan Baek, Jong Hyeob Hwang, Sung-Min Demir, Hilmi Volkan Department of Electrical and Electronics Engineering National Institute of Materials Science and Nanotechnology UNAM Bilkent University 06800 Bilkent Ankara Turkey School of Advanced Materials Engineering Chonbuk National University Chonju 561-756 Korea Republic of Korea Photonics Technology Institute Gwangju 500-460 Korea Republic of Optoelectronics Lab. Korea Electronics Technology Institute Seongnam Gyeonggi 463-816 Korea Republic of School of Electrical and Electronic Engineering Microelectronics Division Nanyang Technological University Singapore 639798 Singapore School of Physical and Mathematical Sciences Physics and Applied Physics Division Nanyang Technological University Singapore 639798 Singapore

ISBN: (纸本)9781424498826

We present a study of quantum confined electroabsorption and carrier dynamics in polar c-plane and nonpolar a-plane InGaN/GaN quantum heterostructures. We demonstrate red-shifting absorption edge, due to quantum confined Stark effect, in nonpolar InGaN/GaN quantum structures in response to increased electric field, while we show the opposite effect with blue-shifting absorption spectra in polar quantum structures. Moreover, confirmed by time-resolved photoluminescence measurements, we prove that carrier lifetimes increase with increasing electric field for nonpolar structures, whereas the opposite occurs for polar ones.

关键词： Electric fields

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Application of block-oriented system identification to modelling paralysed muscle under electrical stimulation

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Lecture Notes in Control and Information sciences 2010年 404卷 403-419页

作者： Cai, Zhijun Bai, Er-Wei Shield, Richard K. Department of Electrical and Computer Engineering University of Iowa Iowa City IA 52242 United States Graduate Program in Physical Therapy and Rehabilitation Science University of Iowa Iowa City IA 52242 United States

ISBN: (纸本)9781849965125

Most biomedical and biological systems have nonlinear dynamics [25, 27], which bring difficulties in modelling and identification. These systems are usually represented as a series of blocks, and each block stands for a linear or nonlinear subsystem. Among those block-oriented models, Wiener model, Hammerstein model and Wiener-Hammerstein model are very popular. The Wiener model is represented as a linear dynamics followed by a nonlinear static system, while the Hammerstein model is composed in the reversed order, and the Wiener-Hammerstein model is constructed as a nonlinear static system surrounded by two linear dynamics (see Figure 24.1). All those three type of models have been extensively researched, and many identification methods have been proposed (e.g. [2, 3, 4, 6, 11, 23, 31, 39, 40]). In this chapter, we use Wiener-Hammerstein system to model the paralysed muscle under electrical stimulation, and propose an effective identification method specifically for the proposed model. © 2010 Springer London.

关键词： Biological systems

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Volumetric plasmonic resonators for very thin organic solar cells

Volumetric plasmonic resonators for very thin organic solar ...

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IEEE Photonics Conference (IPC)

作者： Mustafa Akın Sefunç Ali Kemal Okyay Hilmi Volkan Demir Department of Electrical and Electronics Engineering Department of Physics UNAM-National Nanotechnology UNAM-National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology Bilkent University Ankara Turkey School of Electrical and Electronic Engineering Division of Microelectronics School of Physical and Mathematical Sciences Division of Physics and Applied Physics Nanyang Technological University Singapore Singapore

New-generation thin-film solar cells are designed to feature very thin layers of active material in the order of tens of nanometers, which conveniently offers the advantage of cost reduction. However, this kind of architectures undesirably suffers limited total optical absorption of incident photons in these active layers. To address this problem, there has been an increasing interest in designing plasmonic structures around the active layers for enhancing their total optical absorption. Using a single layer of such plasmonic structures either on the top or at the bottom of these absorbing layers has been extensively studied in the literature. In this work, different than the previous reports, we focus on a new design concept of volumetric plasmonic resonators that relies on the idea of coupling two (or more) layers of coupled plasmonic structures embedded in the organic solar cells. For this, here we incorporate one silver grating on the top of the absorbing layer and another at the bottom of the active layer in order to couple them with each other such that field localization is further increased within the volume of the active material between gratings. In addition to individual plasmonic resonances of these metallic structures, this allows us to take the advantage of the vertical interaction in the volumetric resonator. This interaction contributes to further enhancement of optical absorption in the active layer, beyond the limited photon absorption in non-metallic (bare) organic solar cell. Our results show that this architecture exhibits a substantial absorption enhancement performance particularly under the transverse magnetic (TM) polarized illumination, while the optical absorption is maintained at a similar under the transverse electric (TE) polarized illumination. As a result, the optical absorption in the active layer is enhanced up to ~67%.

关键词： Gratings Plasmons Absorption Photovoltaic cells Optical resonators Computer architecture Silver

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FRET-assisted organic dye molecules using in conjunction with colloidal quantum dots for bio-labelling

FRET-assisted organic dye molecules using in conjunction wit...

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IEEE Photonics Conference (IPC)

作者： Evren Mutlugun Hilmi Volkan Demir Department of Physics Department of Electrical and Electronics Engineering and UNAM-Institute of Materials Science and Nanotechnology Bilkent University Ankara Turkey School of Electrical and Electronic Engineering Division of Microelectronics School of Physical and Mathematical Sciences Luminous Semiconductor Lighting and Display Center of Excellence Nanyang Technological University Singapore Singapore

The paper presents Forster-type resonance energy transfer (FRET)-mediated light-harvesting of CdSe quantum dots for Atto Rhodamine 12 dye molecules using selective excitation wavelengths and achieved up to 4-fold enhancement of the Atto emission. Organic CdSe quantum dots are synthesized using hot injection method, and are emitting at 584 nm with a quantum yield of 31% that are carefully selected to spectrally match the absorption band of the acceptor dye molecules. It is shown that the strong lifetime modifications of the donor and acceptor molecules is the result of light-harvesting FRET, which will be important for bio-labelling.

关键词： Quantum dots Energy exchange Absorption Labeling Photoluminescence Steady-state Nanocrystals

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Au-silica core/shell hybrid nanoparticles furnished with CdTe nanocrystals for enhanced plasmon-exciton interactions

Au-silica core/shell hybrid nanoparticles furnished with CdT...

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IEEE Photonics Conference (IPC)

作者： Ilkem Ozge Ozel Tuncay Ozel Donus Tuncel Hilmi Volkan Demir Department of Physics Department of Chemistry Department of Electrical and Electronics Engineering and UNAM-Institute of Materials Science and Nanotechnology Bilkent University Ankara Turkey School of Electrical & Electronic Engineering Division of Microelectronics School of Mathematical and Physical Sciences Luminous Semiconductor Lighting and Display Center of Excellence Nanyang Technological University Singapore Singapore

To date extensive research efforts have confirmed that optical properties of bulk semiconductors and metals are substantially modified when they are transformed into nano-dimensions. For example, metal nanoparticles with dimensions less than hundred nanometers strongly oscillate at a specific resonance frequency to generate localized surface plasmons depending on their size. This creates strongly localized electric fields in the close proximity of the metal nanoparticles under external excitation. Similarly, because of the size effect, semiconductor quantum dot nanocrystals (NCs), with dimensions less than 10 nanometers, feature highly tunable absorption and emission characteristics. High levels of brightness and photostability, and broad excitation range with sharp emission spectra make these NCs ideal candidates as active materials in light emitting diodes and solar cells, and as fluorescent labels in bioimaging. This paper presents the synthesis and characterization of a new set of CdTe NC decorated, Au-silica core/shell hybrid nanoparticles with silica shell thicknesses controlled and tuned by *** paper demonstrates that Au-silica core/shell nanoparticles can successfully assemble CdTe nanocrystals right on their silica shells for enhanced plasmon-exciton interactions, while avoiding the problems of lacking control in spacing and limited film thickness.

关键词： Gold Silicon compounds Nanocrystals Plasmons Fluorescence

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