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IEEE Photonics Conference (PHO)

作者： Akasaka, Youichi Sekiya, Motoyoshi Fujitsu Labs Amer Inc Richardson TX 75082 USA

PDL caused by fiber splice was evaluated by finite-difference time-domain method. Misalignment, bubble, and bending at the splice were investigated. PDL is observed in all cases and the combination gave a maximum of 0... 详细信息

ISBN: (纸本)9781424489398

关键词： FDTD calculation finite difference methods Loss measurement Optical fiber dispersion Optical fiber polarization time domain analysis bubble bubbles fiber splice finite difference time-domain analysis finite-difference time-domain method misalignment optic

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Efficient approach for the calculation of transmission and reflection spectra of photonic crystal waveguide devices

Efficient approach for the calculation of transmission and r...

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Conference on Nanoengineering - Fabrication, Properties, Optics, and Devices VIII

作者： Chen, Rei-Shin Lin, Yih-Bin Lunghwa Univ Sci & Technol Dept Elect Engn Guishan 33306 Taoyuan County Taiwan

ISBN: (纸本)9780819487124

The conventional approach to calculate the transmission and reflection spectra of a photonic crystal (PC) waveguide device by the finite-difference time-domain method is both time and memory demanding. Here we propose a more efficient approach to obtain these spectra. First, the PC-based absorbing boundary condition is employed. Second, the reflected pulse is obtained by subtracting from a reference waveform. For a T-junction in square lattice PC, a computational cell of 40 x 36 lattice constants can be used instead of 180 x 140 lattice constants. The simulation time is reduced to only one tenth of that using the conventional approach.

关键词： Photonic crystal finite-difference time-domain method transmission spectrum reflection spectrum pulse Fourier transform absorbing boundary condition

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Analysis of optical frequency signal transmission through whispering gallery mode

Analysis of optical frequency signal transmission through wh...

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Conference on Smart Nano-Micro Materials and Devices/SPIE Smart Nano + Micro Materials and Devices Forum

作者： Fukuhara, M. Yu, Y. L. Aihara, T. Nakagawa, K. Yamaguchi, K. Fukuda, M. Toyohashi Univ Technol Dept Elect & Elect Informat Engn 1-1 HibarigaokaTempaku Cho Toyohashi Aichi 4418580 Japan Kagawa Univ Fac Engn Dept Adv Mat Sci Takamatsu Kagawa 7610396 Japan

ISBN: (纸本)9780819488459

In this study, we present an analysis of optical frequency signal transmission through the whispering gallery mode (WGM) generated in a silica microsphere for the application of optical frequency signal transmission to integrated circuits. The behavior of the WGM within a microsphere was analyzed in detail using the finite-difference time-domain method. The electric field distribution in the silica microsphere led to the WGM, and the electric field was amplified within the microsphere. The interval between the peaks of the WGM (free spectral range of the microcavity) was clearly observed in the wavelength spectrum. When two light beams having slightly different wavelengths were guided into the microsphere, a beat frequency corresponding to the difference frequency of the two light beams was also obtained in the simulation. The simulation results were experimentally confirmed by observing the WGM and the beat signal generated in a silica microsphere. From these results, we have theoretically and experimentally clarified the feasibility of optical frequency signal transmission through the WGM.

关键词： whispering gallery mode optical heterodyne beat signal finite-difference time-domain method

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Numerical optimization for the plasmonic Raman sensor including periodic hole arrays and tapering directions

Numerical optimization for the plasmonic Raman sensor includ...

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Conference on Metamaterials - Fundamentals and Applications IV

作者： Yamaguchi, Kenzo Fujii, Masamitsu Gramotnev, Dmitri K. Kagawa Univ Fac Engn Dept Adv Mat Sci 2217-20 Hayashi Cho Kagawa 7610396 Japan Toba Natl Coll Maritime Technol Dept Elect & Mech Toba Mie 5178501 Japan Nanophoton Pty Ltd Brisbane Qld 4035 Australia

ISBN: (纸本)9780819487032

A plasmonic Raman sensor using periodic hole arrays was investigated numerically and experimentally. In previous work, we fabricated a hole array in a thin metal film on a dielectric substrate using focused ion beam lithography and succeeded in observing surface plasmon resonance. We demonstrated the effectiveness of hole shape dependency (i.e., cylindrical or tapered hole structures) for electric field enhancement, transmittance, and reflectance spectra obtained by numerical simulation using the finite-difference time-domain method. Those simulation results for an array of tapered holes agreed well with experimental results. Moreover, we numerically determined the optimized structure in terms of metal film thickness, tapered hole diameter, and hole period. However, optimal structure of a tapered hole array provides insufficient sensitivity (i.e., electric field enhancement) for measuring surface-enhanced Raman scattering. Therefore, we enhanced the electric field by using further structural parameters such as differs from tapered and incident light direction, which we expected to would give us a larger electric field. When the incident light coming from Si3N4 side, the electric field enhancement was increased markedly. The electric field enhancement was more likely to be uninvolved in metal film thicknesses using 300 nm and 500 nm.

关键词： localized surface plasmon tapered hole array nano-focusing gold finite-difference time-domain method

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Designing a Nanometer-Scale Light Bending Structure

Designing a Nanometer-Scale Light Bending Structure

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Conference on Photonics North

作者： Maqsood, M. W. Chau, K. J. Univ British Columbia Sch Engn Kelowna BC Canada

ISBN: (纸本)9780819485816

The emergence of nanotechnology now enables the controlled fabrication of nanometer scale structures capable of steering and confining light waves over small distances. To realize complex nanoscale light guiding structures, it will be necessary to develop methods to guide light around tight bends and corners with high efficiency. Achieving high efficiency waveguide bends, however, is generally difficult because of radiation losses at the bend (1). To achieve tight waveguide bends several approaches have been put forward including the use of dielectric photonic crystals(2) and resonators(3). One recent and promising method to limit the amount of loss over a bend is to restrict the path of light by encasing a bend in an opaque medium, such as metal. Such a bend can be conceptualized by joining the two metal-dielectric-metal (MDM) waveguides such that their dielectric cores are connected to each other at 90 degrees (4-6) as shown in Fig. 1. When the thickness of the dielectric cores is subwavelength, only the lowest order surface plasmon polariton (SPP) mode is sustained by the bend. Further, when the metal walls are constructed from a low-loss metal such as Ag, the SPP mode can propagate over the bend. [GRAPHICS]

关键词： Waveguides Silver Dielectrics Metals Radio propagation Wave propagation Electromagnetism finite-difference time-domain method Light wave propagation Photonic crystals

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Review of the Results of the COST MP0702 Exercise on the Sensitivity of Metal-Dielectric Layered Flat Lens to Fabrication Inaccuracies

Review of the Results of the COST MP0702 Exercise on the Sen...

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13th International Conference on Transparent Optical Networks (ICTON)

作者： Stefaniuk, Tomasz Kotynski, Rafal Baghdasaryan, Hovik Pastuszczak, Anna Marciniak, Marian Lavrinenko, Andrei Panajotov, Krassimir Szoplik, Tomasz Univ Warsaw Fac Phys Pasteura 7 PL-02093 Warsaw Poland State Engn Univ Armenia Fiber Opt Commun Lab Yerevan 0009 Armenia Natl Inst Telecommun PL-04894 Warsaw Poland Tech Univ Denmark Dept Photon Engn DK-2800 Lyngby Denmark Vrije Univ Brussel Dept Appl Phys & Photon IR-TONA B-1050 Brussels Belgium Bulgarian Acad Sci Inst Solid State Phys Sofia 1784 Bulgaria

ISBN: (纸本)9781457708800

We summarise the results of the COST MP0702 exercise on the sensitivity of metal-dielectric layered superlens to fabrication inaccuracies. The major results of this joint task have been already published in Ref. 1, Opto-Electronics Review, vol. 18(4), pp. 446-457, 2010. The numerical analysis of the superlens is based on the transfer matrix method, the finite-difference time-domain technique, and the method of single expression, and is compared with a simplified effective medium approach. The lens is designed for imaging with subwavelength resolution at wavelength of 441 nm. Its operation may be attributed to self-collimation with a secondary role of Fabry-Perot resonant transmission. We have estimated the resolution, transmission efficiency and sensitivity with respect to fabrication inaccuracies of this superlens. The tolerance analysis indicates that the resolution and transmission efficiency are highly sensitive to even small changes of layer thicknesses.

关键词： Plasmonics nanophotonics nanolenses superresolution multilayers finite-difference time-domain method single expression method transfer matrix method effective medium theory

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Computed Effects of Sweat Gland Ducts on the Propagation of 94 Ghz Waves in Skin

Computed Effects of Sweat Gland Ducts on the Propagation of ...

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Conference on Energy-Based Treatment of Tissue and Assessment VI

作者： Shafirstein, Gal Moros, Eduardo G. Univ Arkansas Med Sci Dept Otolaryngol 4301 W Markham Little Rock AR 72205 USA Univ Arkansas Med Sci Dept Radiat Oncol Little Rock AR 72205 USA

ISBN: (纸本)9780819484383

The effects of sweat gland ducts (SGD) on specific absorption rate and temperatures during millimeter wave irradiation of skin were investigated with a high resolution finite differences time domain model consisting of a 30 mu m stratum corneum (SC), a 350 mu m epidermis, 1000 mu m dermis and five SGD (60 mu m radius, 300 mu m height, 370 mu m separation). The source was a WR-10 waveguide irradiating at 94 GHz. Without SGD, specific absorption rate (SAR) and temperature maximum were in the dermis near epidermis. With SGD, a higher SAR maximum was inside SGD in the epidermis while temperature maximum moved to the epidermis/stratum-corneum junction. SGD significantly affected how GHz waves were absorbed in the skin. Implications of these finding in nociceptive research will be discussed as well as other potential medical applications.

关键词： Skin Synthetic aperture radar Absorption Wave propagation Waveguides Radio propagation Electromagnetism Extremely high frequency finite-difference time-domain method Medical research

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Advances in Photonics Design and Modeling for Nano- and Bio-photonics Applications

Advances in Photonics Design and Modeling for Nano- and Bio-...

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16th International School on Quantum Electronics - Laser Physics and Applications

作者： Tanev, Stoyan Tuchin, Valery Cheben, Pavel Bock, Przemek Schmid, Jens Pond, James Univ. of Southern Denmark (Denmark) N.G. Chernyshevsky Saratov State Univ. (Russian Federation) Institute of Precise Mechanics and Control (Russian Federation) National Research Council Canada (Canada) Lumerical Solutions Inc. (Canada)

ISBN: (纸本)9780819482372

In this invited paper we focus on the discussion of two recent unique applications of the finite-difference time-domain (FDTD) simulation method to the design and modeling of advanced nano-and bio-photonic problems. We will first discuss the application of a traditional formulation of the FDTD approach to the modeling of sub-wavelength photonics structures. Next, a modified total/scattered field FDTD approach will be applied to the modeling of biophotonics applications including Optical Phase Contrast Microscope (OPCM) imaging of cells containing gold nanoparticles (NPs) as well as its potential application as a modality for in vivo flow cytometry configurations. The discussion of the results shows that the specifics of optical wave phenomena at the nano-scale opens the opportunity for the FDTD approach to address new application areas with a significant research potential.

关键词： finite-difference time-domain method sub-wavelength nanophotonic structures optical phase contrast microscope optical clearing effect biological cell gold nanoparticles biomedical imaging

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Fibre Fabry - Perot cavity-based aperture probe for near-field optical microscopy systems

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QUANTUM ELECTRONICS 2011年第3期41卷 249-252页

作者： Kulchin, Yu. N. Vitrik, O. B. Bezverbnyi, A. V. Pustovalov, E. V. Kuchmizhak, A. A. Nepomnyashchii, A. V. Russian Acad Sci Far Eastern Branch Inst Automat & Control Proc Vladivostok 690004 Russia Far Eastern Fed Univ Inst Phys & Informat Technol Vladivostok 690950 Russia

We report a theoretical analysis and experimental study of the possibility of producing a novel type of interferometric near-field aperture probe for near-field optical microscopy systems using a fibre Fabry - Perot microcavity with a nanometre-scale aperture made in one of its output mirrors. The probe ensures a spatial resolution no worse than lambda/04.

关键词： aperture-based near-field optical microscopy optical fibre Fabry - Perot interferometer finite-difference time-domain method

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Modification of the scattering of silver nanoparticles induced by Fabry-Perot resonances rising from a finite Si layer

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JOURNAL OF OPTICS 2011年第1期13卷

作者： Marrocco, V Marani, R Grande, M Morea, G Calo, G Petruzzelli, V D'Orazio, A Politecn Bari Dipartimento Elettrotecn & Elettron I-70125 Bari Italy

In this paper we theoretically give evidence of the enhancement of scattering phenomena related to single metal nanoparticles having different shapes and located on a silicon layer having finite thickness, thus resembling a thin film solar cell. The study has been carried out in order to deeply understand how the presence of corners (nanobrick) or rounded edges (nanosphere) and the contact surfaces between the metal nanoparticle and the semiconductor affect the scattering when a finite Si layer is considered right below the nanoparticles. Arrays of such silver nanoparticles have also been investigated through a proprietary finite-difference time-domain-based code. The comparison with a typical configuration, where the semiconductor layer is semi-infinite, leads us to note that, in dependence on the shape and size of the nanoparticles, the finite layer, which acts as a Fabry-Perot resonant cavity, is able to exceptionally twist the forward and backward scattering. In particular the forward scattering in all cases is enhanced, whereas the backward scattering seems to be more sensitive to the interference induced by resonances rising in the finite dielectric layers, since it exhibits opposite effects depending on the nanoparticle shapes.

关键词： surface plasmons metal nanoparticles scattering finite-difference time-domain method

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