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Articoli di riviste sul tema "Coupled waveguides"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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1

Seidel, Andreas, Jacek Gosciniak, Maria U. Gonzalez, Jan Renger, Carsten Reinhardt, Roman Kiyan, Romain Quidant, Sergey I. Bozhevolnyi e Boris N. Chichkov. "Fiber-Coupled Surface Plasmon Polariton Excitation in Imprinted Dielectric-Loaded Waveguides". International Journal of Optics 2010 (2010): 1–6. http://dx.doi.org/10.1155/2010/897829.

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We present fiber-coupled dielectric-loaded plasmonic waveguides for 1.55 μm telecom wavelength fabricated by two-photon polymerization and nanoimprint lithography. The waveguide structures include 100-μm-long plasmonic waveguides connected on both ends to tapered dielectric waveguides used for end-fire coupling with optical fibers. The excitation of plasmonic waveguides is verified via polarization-resolved measurements of the overall transmission, demonstrating thereby that this technology is suitable in principle for the integration of plasmonic components into fiberoptics. Loss mechanisms are investigated and improvements suggested to reduce transmission losses and consequently increase the viability of practical application.

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Petersen, Jan, Jürgen Volz e Arno Rauschenbeutel. "Chiral nanophotonic waveguide interface based on spin-orbit interaction of light". Science 346, n. 6205 (4 settembre 2014): 67–71. http://dx.doi.org/10.1126/science.1257671.

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Controlling the flow of light with nanophotonic waveguides has the potential of transforming integrated information processing. Because of the strong transverse confinement of the guided photons, their internal spin and their orbital angular momentum get coupled. Using this spin-orbit interaction of light, we break the mirror symmetry of the scattering of light with a gold nanoparticle on the surface of a nanophotonic waveguide and realize a chiral waveguide coupler in which the handedness of the incident light determines the propagation direction in the waveguide. We control the directionality of the scattering process and can direct up to 94% of the incoupled light into a given direction. Our approach allows for the control and manipulation of light in optical waveguides and new designs of optical sensors.

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Wang, Yiquan, Tianzhe Wang e Juan Liu. "Waveguide modes in coupled-resonator optical waveguides". Physics Letters A 353, n. 1 (aprile 2006): 101–4. http://dx.doi.org/10.1016/j.physleta.2005.12.099.

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4

Weeber, Jean-Claude, Gérard Colas-des-Francs, Alexandre Bouhelier, Aymeric Leray, Kirill Vasilev, Xiao Yu, Kamal Hammani et al. "Colloidal quantum dots decorated micro-ring resonators for efficient integrated waveguides excitation". Nanophotonics 9, n. 6 (24 aprile 2020): 1411–23. http://dx.doi.org/10.1515/nanoph-2019-0516.

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AbstractMicro-ring resonators made of titanium dioxide were decorated with local light sources comprising CdSe/CdS colloidal quantum dot aggregates. The active micro-resonators are operated to achieve efficient evanescent excitation of nearby co-planar integrated waveguides. Coupled-mode analysis and numerical simulations are used to capture the dynamic of the optical interaction between locally activated resonators and integrated waveguides. In this context, we exemplify the key role of resonator intrinsic loss. Next, we show that locally activated or bus-waveguide excited resonators are in optimum waveguide interaction for the same so-called critical coupling condition, although the physical origin of this property is different for each configuration. More importantly, we found that a locally activated resonator is a fabrication imperfection tolerant configuration for the coupling light of local sources into waveguides. This remarkable property originates from the opposite change of the power cycling into the resonator and the waveguide coupling efficiency as a function of the resonator-waveguide separation gap. By operating an 8-μm-radius ring resonator with loaded quality factors around Q = 2100, we experimentally demonstrate a 5.5-dB enhancement of the power coupled into the output waveguide compared to a direct local source waveguide excitation.

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5

Bankov, S. E., V. I. Kalinichev e E. V. Frolova. "Coupled EBG Waveguides". Journal of Communications Technology and Electronics 66, n. 4 (aprile 2021): 375–85. http://dx.doi.org/10.1134/s106422692104001x.

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6

LI, DENG-FENG, HUI-NING DONG, XIAO-TAO ZU e YI-SHEN QIU. "A CORRECTED SCALAR COUPLED-MODE THEORY FOR THE ANISOTROPIC WAVEGUIDE". International Journal of Modern Physics B 21, n. 02 (20 gennaio 2007): 159–68. http://dx.doi.org/10.1142/s0217979207036515.

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A new coupled-mode formulation based on scalar modes is developed for the anisotropic optical waveguide. In the new formulation, the birefringence property of the material is represented as additional coupling to the coupling due to the refractive-index perturbations. The theory is applied to the direction coupler made of parallel slab waveguides. The numerical results show that the numerical value of the birefringence coupling correction is around 10% as much as that of the refractive-index perturbation coupling for the special case.

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7

Shamonin, M., M. Lohmeyer e P. Hertel. "Directional coupler based on radiatively coupled waveguides". Applied Optics 36, n. 3 (20 gennaio 1997): 635. http://dx.doi.org/10.1364/ao.36.000635.

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8

Slobodianiuk, D. V. "Excitation of Ultrashort Spin Waves via Spin-Cherenkov Effect in Magnetic Waveguides". Ukrainian Journal of Physics 66, n. 5 (28 maggio 2021): 424. http://dx.doi.org/10.15407/ujpe66.5.424.

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The excitation of ultrashort wavelength spin waves via the spin-Cherenkov effect in magnetic waveguides is investigated via a micromagnetic modeling. The proposed excitation method is relatively simple and easily tunable. The excitation efficiency of the proposed scheme is obtained for different excitation pulse velocities and widths. A coupled waveguide system is also considered. In this case, the spin waves are excited in the first waveguide and then are transferred to the second one due to the dipolar coupling between waveguides. It is also shown that the excitation and transfer of excited spin waves have some limitations related to the dipolar coupling mechanism between the waveguides.

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9

Yang, Chunmei, Wenyu Luo, Renhe Zhang, Liangang Lyu e Fangli Qiao. "An Efficient Coupled-Mode Formulation for Acoustic Propagation in Inhomogeneous Waveguides". Journal of Computational Acoustics 24, n. 01 (marzo 2016): 1550019. http://dx.doi.org/10.1142/s0218396x15500198.

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The direct-global-matrix coupled-mode model (DGMCM) for sound propagation in range-dependent waveguides was recently developed by Luo et al. [A numerically stable coupled-mode formulation for acoustic propagation in range-dependent waveguides, Sci. China G: Phys. Mech. Astron. 55 (2012) 572–588]. A brief review of the formulation and characteristics of this model is given. This paper extends this model to deal with realistic problems involving an inhomogeneous water column and a penetrable sloping bottom. To this end, the normal mode model KRAKEN is adopted to provide local modal solutions and their associated coupling matrices. As a result, the extended DGMCM model is capable of providing full two-way solutions to two-dimensional (2D) realistic problems with a depth- and range-dependent sound speed profile as well as a penetrable sloping bottom. To validate this model, it is first applied to a benchmark problem of sound propagation in a plane-parallel waveguide with a depth- and range-dependent sound speed profile, and then it is applied to a problem involving both an inhomogeneous water column and a sloping bottom. Comparisons with the analytical solution proposed by DeSanto and with the numerical model COUPLE are also provided, which show that the extended DGMCM model is accurate and efficient and hence can serve as a benchmark for realistic problems of sound propagation in an inhomogeneous waveguide.

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Dalir, Hamed, Farzad Mokhtari-Koushyar, Iman Zand, Elham Heidari, Xiaochuan Xu, Zeyu Pan, Shuai Sun, Rubab Amin, Volker J. Sorger e Ray T. Chen. "Atto-Joule, high-speed, low-loss plasmonic modulator based on adiabatic coupled waveguides". Nanophotonics 7, n. 5 (24 maggio 2018): 859–64. http://dx.doi.org/10.1515/nanoph-2017-0092.

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AbstractIn atomic multi-level systems, adiabatic elimination (AE) is a method used to minimize complicity of the system by eliminating irrelevant and strongly coupled levels by detuning them from one another. Such a three-level system, for instance, can be mapped onto physically in the form of a three-waveguide system. Actively detuning the coupling strength between the respective waveguide modes allows modulating light to propagate through the device, as proposed here. The outer waveguides act as an effective two-photonic-mode system similar to ground and excited states of a three-level atomic system, while the center waveguide is partially plasmonic. In AE regime, the amplitude of the middle waveguide oscillates much faster when compared to the outer waveguides leading to a vanishing field build up. As a result, the plasmonic intermediate waveguide becomes a “dark state,” hence nearly zero decibel insertion loss is expected with modulation depth (extinction ratio) exceeding 25 dB. Here, the modulation mechanism relies on switching this waveguide system from a critical coupling regime to AE condition via electrostatically tuning the free-carrier concentration and hence the optical index of a thin indium thin oxide (ITO) layer resides in the plasmonic center waveguide. This alters the effective coupling length and the phase mismatching condition thus modulating in each of its outer waveguides. Our results also promise a power consumption as low as 49.74aJ/bit. Besides, we expected a modulation speed of 160 GHz reaching to millimeter wave range applications. Such anticipated performance is a direct result of both the unity-strong tunability of the plasmonic optical mode in conjunction with utilizing ultra-sensitive modal coupling between the critically coupled and the AE regimes. When taken together, this new class of modulators paves the way for next generation both for energy and speed conscience optical short-reach communication such as those found in interconnects.

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Hasan, M. Arif, Lazaro Calderin, Trevor Lata, Pierre Lucas, Keith Runge e Pierre A. Deymier. "Directional Elastic Pseudospin and Nonseparability of Directional and Spatial Degrees of Freedom in Parallel Arrays of Coupled Waveguides". Applied Sciences 10, n. 9 (4 maggio 2020): 3202. http://dx.doi.org/10.3390/app10093202.

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We experimentally and numerically investigated elastic waves in parallel arrays of elastically coupled one-dimensional acoustic waveguides composed of aluminum rods coupled along their length with epoxy. The elastic waves in each waveguide take the form of superpositions of states in the space of direction of propagation. The direction of propagation degrees of freedom is analogous to the polarization of a quantum spin; hence, these elastic waves behave as pseudospins. The amplitude in the different rods of a coupled array of waveguides (i.e., the spatial mode of the waveguide array) refer to the spatial degrees of freedom. The elastic waves in a parallel array of coupled waveguides are subsequently represented as tensor products of the elastic pseudospin and spatial degrees of freedom. We demonstrate the existence of elastic waves that are nonseparable linear combinations of tensor products states of pseudospin/ spatial degrees of freedom. These elastic waves are analogous to the so-called Bell states of quantum mechanics. The amplitude coefficients of the nonseparable linear combination of states are complex due to the Lorentzian character of the elastic resonances associated with these waves. By tuning through the amplitudes, we are able to navigate both experimentally and numerically a portion of the Bell state Hilbert space.

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12

Chong, Lip Fah, Jing Hua Teng, Ee Leong Lim, Norman Soo Seng Ang, J. R. Dong e Soo Jin Chua. "DFB Lasers with Tilted Waveguide for Multi-Wavelength Generation". Advanced Materials Research 31 (novembre 2007): 36–38. http://dx.doi.org/10.4028/www.scientific.net/amr.31.36.

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In this paper, we present the theoretical investigation of index-coupled distributed feedback (DFB) laser with tilted single mode ridge waveguides. By tilting part of the ridge waveguide in various degrees, DFB laser with manifold effective grating periods can be realized. The structure is analyzed using couple mode theory in matrix form based on threshold analysis. Important parameters of DFB laser like resonant frequency and threshold gains are obtained by solving the eigen-equation. The results indicate not only that the lasing frequency is modulated by the waveguide titling angle, but also large Gain Margin (GM) can be achieved at the threshold condition which enhance the stable single mode operation in index-coupled DFB laser.

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Liu, Juan, e Qi Li. "Coupled Mode Sound Propagation in Inhomogeneous Stratified Waveguides". Applied Sciences 11, n. 9 (27 aprile 2021): 3957. http://dx.doi.org/10.3390/app11093957.

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An efficient coupled mode method for modeling sound propagation in horizontally stratified inhomogeneous waveguides, in which the seabed is modeled as a (layered) acoustic medium, is presented. The method is based on Fawcett’s coupled mode method and the multimodal admittance method. The acoustic field is expanded onto the unusual local eigenfunctions composed by normal modes in the corresponding one-layer homogeneous waveguides with constant depth equal to the local total depth of the multilayered waveguide. A set of energy-conserving first-order differential equations governing the modal amplitudes of acoustic fields is derived. The admittance method is employed to solve the differential equations in a numerically stable manna. The coupled mode method considers the backscattering effect of inhomogeneities and full coupling between local modes, and offers improvement from the viewpoint of efficiency and computational cost. The acoustic fields predicted by the method agree well with those computed by the commercial finite element software COMSOL Multiphysics. The method can be extended to further establish fast and accurate 3D sound propagation models in complex shallow water environments.

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Li, Xuefeng, Zhaolu Wang e Hongjun Liu. "The Coupled Nonlinear Schrödinger Equations Describing Power and Phase for Modeling Phase-Sensitive Parametric Amplification in Silicon Waveguides". Journal of Applied Mathematics 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/621751.

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The coupled nonlinear Schrödinger (NLS) equations describing power and phase of the optical waves are used to model phase-sensitive (PS) parametric amplification in a width-modulated silicon-on-insulator (SOI) channel waveguide. Through solving the coupled NLS equations by the split-step Fourier and Runge-Kutta integration methods, the numerical results show that the coupled NLS equations can perfectly describe and character the PS amplification process in silicon waveguides.

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15

Mookherjea, S., e A. Yariv. "Coupled resonator optical waveguides". IEEE Journal of Selected Topics in Quantum Electronics 8, n. 3 (maggio 2002): 448–56. http://dx.doi.org/10.1109/jstqe.2002.1016347.

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16

Capmany, J., P. Muñoz, J. D. Domenech e M. A. Muriel. "Apodized coupled resonator waveguides". Optics Express 15, n. 16 (2007): 10196. http://dx.doi.org/10.1364/oe.15.010196.

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Sychugov, V. A., A. V. Tishchenko e B. A. Usievich. "Radiatively coupled corrugated waveguides". Quantum Electronics 24, n. 5 (31 maggio 1994): 442–44. http://dx.doi.org/10.1070/qe1994v024n05abeh000112.

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Yavuz, Nurperi, Mustafa Mert Bayer, Hüseyin Ozan Ҫirkinoğlu, Ali Serpengüzel, Thien Le Phu, Argyro Giakoumaki, Vibhav Bharadwaj, Roberta Ramponi e Shane M. Eaton. "Laser-Inscribed Diamond Waveguide Resonantly Coupled to Diamond Microsphere". Molecules 25, n. 11 (10 giugno 2020): 2698. http://dx.doi.org/10.3390/molecules25112698.

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An all-diamond photonic circuit was implemented by integrating a diamond microsphere with a femtosecond-laser-written bulk diamond waveguide. The near surface waveguide was fabricated by exploiting the Type II fabrication method to achieve stress-induced waveguiding. Transverse electrically and transverse magnetically polarized light from a tunable laser operating in the near-infrared region was injected into the diamond waveguide, which when coupled to the diamond microsphere showed whispering-gallery modes with a spacing of 0.33 nm and high-quality factors of 105. By carefully engineering these high-quality factor resonances, and further exploiting the properties of existing nitrogen-vacancy centers in diamond microspheres and diamond waveguides in such configurations, it should be possible to realize filtering, sensing and nonlinear optical applications in integrated diamond photonics.

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19

Ly-Gagnon, Dany-Sebastien, Krishna C. Balram, Justin S. White, Pierre Wahl, Mark L. Brongersma e David A. B. Miller. "Routing and photodetection in subwavelength plasmonic slot waveguides". Nanophotonics 1, n. 1 (1 luglio 2012): 9–16. http://dx.doi.org/10.1515/nanoph-2012-0002.

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AbstractThe ability to manipulate light at deeply sub-wavelength scales opens a broad range of research possibilities and practical applications. In this paper, we go beyond recent demonstrations of active photonic devices coupled to planar plasmonic waveguides and demonstrate a photodetector linked to a two conductor metallic slot waveguide that supports a mode with a minute cross-sectional area of ∼λ2/100. We demonstrate propagation lengths of ∼10λ (at 850 nm), routing around 90° bends and integrated detection with a metal-semiconductor-metal (MSM) photodetector. We show polarization selective excitation of the slot mode and measure its propagation characteristics by studying the Fabry-Perot oscillations in the photocurrent spectra from the waveguide-coupled detector. Our results demonstrate the practicality of transferring one of the most successful microwave and RF waveguide technologies to the optical domain, opening up many opportunities in areas such as biosensing, information storage and communication.

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Reichert, W. M., J. T. Ives, P. A. Suci e V. Hlady. "Excitation of Fluorescent Emission from Solutions at the Surface of Polymer Thin-Film Waveguides: An Integrated Optics Technique for the Sensing of Fluorescence at the Polymer/Solution Interface". Applied Spectroscopy 41, n. 4 (maggio 1987): 636–40. http://dx.doi.org/10.1366/0003702874448724.

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In this paper we report a technique for the excitation and collection of fluorescence in a flow cell coupled to the surface of an integrated optical waveguide. The waveguides were 1–2–µm-thick poly(styrene) films spuncast onto acid-cleaned Pyrex® microscope slides. The flow cell was used to introduce fluorescent solutions to the light energy at the polymer waveguide surface. The flow cell volume consisted of a 0.051-cm-thick silastic gasket sandwiched between a glass collection window and the polymer waveguide surface. Fluorescence data from the waveguide surface excitation of fluorescein solutions are presented. Evanescent- and scatter-excited emissions are separated with the use of light attenuation theory. The application of polymer thin-film waveguides to the study of protein adsorption at the polymer/solution interface is discussed.

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Belyaev, B. A., K. V. Lemderg e V. F. Shabanov. "Investigation of electromagnetic wave transmission line based on coupled dielectric resonators". Доклады Академии наук 489, n. 3 (29 novembre 2019): 240–45. http://dx.doi.org/10.31857/s0869-56524893240-245.

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An analogue of optical waveguide consisting of metallic nanoparticles chain was investigated using modified cylindrical dielectric resonators (DR) in the microwave range. The two lowest resonances of the DR correspond to the dipole and quadrupole modes of oscillations similar to plasma oscillations in spherical nanoparticles. It is shown that a waveguide consisting of seven resonators has high frequency selective properties and relatively low losses, if the resonances of quadrupole modes are used to form its bandwidth. The characteristics of the studied waveguide remain almost unchanged at its bending by 90. Cross-section of the main part of energy localization in waveguide is 5 times less than the length of the electromagnetic wave, which roughly corresponds to the optical waveguides based on plasmon oscillations in nanoparticles.

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Huang, Yin, Changjun Min, Liu Yang e Georgios Veronis. "Nanoscale Plasmonic Devices Based on Metal-Dielectric-Metal Stub Resonators". International Journal of Optics 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/372048.

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We review some of the recent research activities on plasmonic devices based on metal-dielectric-metal (MDM) stub resonators for manipulating light at the nanoscale. We first introduce slow-light subwavelength plasmonic waveguides based on plasmonic analogues of periodically loaded transmission lines and electromagnetically induced transparency. In both cases, the structures consist of a MDM waveguide side-coupled to periodic arrays of MDM stub resonators. We then introduce absorption switches consisting of a MDM plasmonic waveguide side-coupled to a MDM stub resonator filled with an active material.

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YAO, XIANKUN. "WAVELENGTH DEMULTIPLEXING IN METAL–INSULATOR–METAL PLASMONIC WAVEGUIDES". Modern Physics Letters B 28, n. 04 (4 febbraio 2014): 1450025. http://dx.doi.org/10.1142/s0217984914500250.

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In this paper, we have numerically investigated a novel kind of ultra-compact wavelength demultiplexing (WDM) in high-confined metal–insulator–metal (MIM) plasmonic waveguides. It is found that the drop transmission efficiency of the filtering cavity can be strongly enhanced by introducing a side-coupled cavity in the MIM waveguide. The theoretical analysis is verified by the finite-difference time-domain simulations. Through cascading the filtering units, a highly effective triple-wavelength demultiplexer is proposed by selecting the specific separation between the two coupled cavities of filtering units. Our results may find potential applications for the nanoscale WDM systems in highly integrated optical circuits and networks.

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Perrey-Debain, Emmanuel, e I. David Abrahams. "TE Mode Mixing Dynamics in Curved Multimode Optical Waveguides". Communications in Computational Physics 11, n. 2 (febbraio 2012): 525–40. http://dx.doi.org/10.4208/cicp.211209.200710s.

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AbstractPropagation of light through curved graded index optical waveguides supporting an arbitrary high number of modes is investigated. The discussion is restricted to optical wave fields which are well confined within the core region and losses through radiation are neglected. Using coupled mode theory formalism, two new forms for the propagation kernel for the transverse electric (TE) wave as it travels along a curved two-dimensional waveguide are presented. One form, involving the notion of “bend” modes, is shown to be attractive from a computational point of view as it allows an efficient numerical evaluation of the optical field for sharply bent waveguides.

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Little, B. E. "Filter synthesis for coupled waveguides". Journal of Lightwave Technology 15, n. 7 (luglio 1997): 1149–55. http://dx.doi.org/10.1109/50.596960.

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Song, Junfeng, Lian-Wee Luo, Xianshu Luo, Haifeng Zhou, Xiaoguang Tu, Lianxi Jia, Qing Fang e Guo-Qiang Lo. "Loop coupled resonator optical waveguides". Optics Express 22, n. 20 (25 settembre 2014): 24202. http://dx.doi.org/10.1364/oe.22.024202.

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Melnichuk, O. P., e I. Yu Popov. "Coupled dielectric waveguides: variational estimations". Journal of Mathematical Physics 46, n. 7 (luglio 2005): 073501. http://dx.doi.org/10.1063/1.1933046.

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Żakowicz, Władysław. "Two coupled dielectric cylindrical waveguides". Journal of the Optical Society of America A 14, n. 3 (1 marzo 1997): 580. http://dx.doi.org/10.1364/josaa.14.000580.

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Liu, Hui, e Shining Zhu. "Coupled magnetic resonator optical waveguides". Laser & Photonics Reviews 7, n. 6 (5 marzo 2013): 882–900. http://dx.doi.org/10.1002/lpor.201200069.

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Duyar, M., V. Akan, E. Yazgan e M. Bayrak. "Analyses of elliptical coplanar coupled waveguides and coplanar coupled waveguides with finite ground width". IEEE Transactions on Microwave Theory and Techniques 54, n. 4 (giugno 2006): 1388–95. http://dx.doi.org/10.1109/tmtt.2006.871354.

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Türschmann, Pierre, Hanna Le Jeannic, Signe F. Simonsen, Harald R. Haakh, Stephan Götzinger, Vahid Sandoghdar, Peter Lodahl e Nir Rotenberg. "Coherent nonlinear optics of quantum emitters in nanophotonic waveguides". Nanophotonics 8, n. 10 (30 agosto 2019): 1641–57. http://dx.doi.org/10.1515/nanoph-2019-0126.

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AbstractCoherent quantum optics, where the phase of a photon is not scrambled as it interacts with an emitter, lies at the heart of many quantum optical effects and emerging technologies. Solid-state emitters coupled to nanophotonic waveguides are a promising platform for quantum devices, as this element can be integrated into complex photonic chips. Yet, preserving the full coherence properties of the coupled emitter-waveguide system is challenging because of the complex and dynamic electromagnetic landscape found in the solid state. Here, we review progress toward coherent light-matter interactions with solid-state quantum emitters coupled to nanophotonic waveguides. We first lay down the theoretical foundation for coherent and nonlinear light-matter interactions of a two-level system in a quasi-one-dimensional system, and then benchmark experimental realizations. We discuss higher order nonlinearities that arise as a result of the addition of photons of different frequencies, more complex energy level schemes of the emitters, and the coupling of multiple emitters via a shared photonic mode. Throughout, we highlight protocols for applications and novel effects that are based on these coherent interactions, the steps taken toward their realization, and the challenges that remain to be overcome.

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Pham, Hoang Duc, Soeren Ploennigs e Wolfgang Mathis. "Modeling and Simulation of stochastically deformed Waveguides using Schelkunoff's Method". Advances in Radio Science 16 (4 settembre 2018): 35–41. http://dx.doi.org/10.5194/ars-16-35-2018.

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Abstract. This paper deals with the propagation of electromagnetic waves in cylindrical waveguides with irregularly deformed cross-sections. The general theory of electromagnetic waves is of high interest because of its practical use as a transmission medium. But only in a few special cases, an analytic solution of Maxwell's equations and the appropriate boundary conditions can be found (Spencer, 1951). The coupled-mode theory, also known as Schelkunoff's method, is a semi-numerical method for computing electromagnetic waves in hollow and cylindrical waveguides bounded by perfect electric walls (Saad, 1985). It allows to calculate the transverse field pattern and the propagation constant. The aim of this paper is to derive the so-called generalized telegraphist's equations for irregular deformed waveguides. Subsequently, the method's application will be used on a circular waveguide as an illustrating example.

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Sun, Baoguang, Xiaofeng Wang, Canmei Zhou e Yuqin Fan. "Fiber-to-waveguide coupling based on plasmonic devices". International Journal of Modern Physics B 34, n. 25 (15 settembre 2020): 2050225. http://dx.doi.org/10.1142/s0217979220502252.

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Due to the large difference in mode size and effective-index mismatch between the optical fiber and the waveguides on the photonic integrated circuits, it is a big challenge to efficiently couple light into thin semiconductor waveguides. In this paper, a taper plasmonic coupler is presented to couple fiber light into an Si waveguide. The taper plasmonic coupler structure is optimized, and the alignment tolerance of the gap, the lateral offset and the vertical offset between coupler and Si waveguide are studied. Numerical simulation shows that the coupler changes the single mode fiber light to multimode light at its input port section, while at its output port section, the coupler turns the multimode light back to a single mode light, and finally couples this light to Si waveguide. The maximum couple efficiency is 86.8% in [Formula: see text] effective coupler length.

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Chatzidimitriou, Dimitrios, Alexandros Pitilakis, Traianos Yioultsis e Emmanouil Kriezis. "Nonreciprocal propagation in a non-Hermitian silicon photonic coupler employing graphene saturable absorption". EPJ Web of Conferences 238 (2020): 11006. http://dx.doi.org/10.1051/epjconf/202023811006.

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Abstract (sommario):

We present the concept, analysis and design of a nonreciprocal system of coupled nonlinear waveguides, operating at the near infrared. We exploit the spatial asymmetry induced by the exceptional points of a non-Hermitian coupler which, combined with saturable absorption in the nonlinear regime, can break Lorentz reciprocity. In this work, we introduce asymmetric losses in a pair of coupled silicon waveguides by overlaying only one of them with unbiased graphene, subject to saturable absorption. The device can be used as a broadband half-duplex isolator: a two-port component offering unidirectional transmission of high-power signals.

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35

Kumar, Sushil, Gaurav Sharma, Gulab Chand Yadav, Vivek Singh e Abhay Kumar Singh. "A novel method of plasmon coupled optical waveguide for aerosol sensor-=SUP=-*-=/SUP=-". Оптика и спектроскопия 129, n. 11 (2021): 1425. http://dx.doi.org/10.21883/os.2021.11.51650.1014-21.

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Abstract (sommario):

The tropospheric aerosol characterization is important for understanding environmental process as well as human health safety. In this study, the surface plasmon resonance sensor is proposed for the detection of ammonium sulfate which is an important component of aerosols. The reflectivity of proposed sensor waveguides is calculated as a function of the incident angle using the transfer matrix method. The performance of proposed sensors having sol-gel film of tetraethylorthosilane and thymolblue are studied and compared. Firstly, the dispersion characteristics are obtained for different modes, and it is observed that the modes are tightly bound in thymol blue waveguide in comparison to tetraethylorthosilane waveguide. Further, the magnetic field distributions are also studied and compared for proposed waveguide sensor configurations. It is found that the sol-gel film of thymol blue waveguide provides high sensitivity while tetraethylorthosilane waveguide shows high figure of merit. Keywords: aerosol, surface plasmon resonance sensor; reflectivity, sensitivity, detection accuracy.

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36

Cooper, Michael L., Greeshma Gupta, Mark A. Schneider, William M. J. Green, Solomon Assefa, Fengnian Xia, Dawn K. Gifford e Shayan Mookherjea. "Waveguide dispersion effects in silicon-on-insulator coupled-resonator optical waveguides". Optics Letters 35, n. 18 (3 settembre 2010): 3030. http://dx.doi.org/10.1364/ol.35.003030.

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37

Chang, Hosung, e Je-Myung Jeong. "A modified coupled-mode analysis for asymmetric coupled waveguides". Microwave and Optical Technology Letters 13, n. 5 (5 dicembre 1996): 277–80. http://dx.doi.org/10.1002/(sici)1098-2760(19961205)13:5<277::aid-mop9>3.0.co;2-d.

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38

Tang, Ting Ting, e Li Luo. "Refractive-Index Sensor Based on Metal-Insulator-Metal Waveguides". Applied Mechanics and Materials 742 (marzo 2015): 46–49. http://dx.doi.org/10.4028/www.scientific.net/amm.742.46.

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Abstract (sommario):

We propose a refractive sensor based on directional coupling between two metal-insulator-metal (MIM) waveguides to measure the refractive index change of the insulator, which is designed to be with a structure of metal-insulator-metal-insulator-metal (MIMIM) in which surface plasmon waves (SPW) are excited. The propagation properties are analyzed by coupled mode theory, and the expressions about the coupling coefficient, coupling length and sensitivity are derived. The sensing properties based on simulation results are also discussed. Compared with a dielectric waveguide, the total size of our sensor with MIMIM waveguide is about one tenth that with dielectric materials, while the sensitivity is improved ten times larger than the former.

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39

Zhang, Q., e S. N. Khan. "Compact Broadside Coupled Directional Coupler Based on Coplanar CRLH Waveguides". Journal of Electromagnetic Waves and Applications 23, n. 2-3 (1 gennaio 2009): 267–77. http://dx.doi.org/10.1163/156939309787604418.

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40

Chieh-Pin Chang, Jui-Chieh Chiu, Hua-Yueh Chiu e Yeong-Her Wang. "A 3-dB Quadrature Coupler Using Broadside-Coupled Coplanar Waveguides". IEEE Microwave and Wireless Components Letters 18, n. 3 (marzo 2008): 191–93. http://dx.doi.org/10.1109/lmwc.2008.916805.

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41

Chen Xin, 陈欣, 孟伟 Meng Wei e 楼慈波 Lou Cibo. "Structure of Adiabatic Coupled Supersymmetric Waveguides". Acta Optica Sinica 39, n. 2 (2019): 0223001. http://dx.doi.org/10.3788/aos201939.0223001.

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42

Sydoruk, O., E. Shamonina e L. Solymar. "Parametric amplification in coupled magnetoinductive waveguides". Journal of Physics D: Applied Physics 40, n. 22 (2 novembre 2007): 6879–87. http://dx.doi.org/10.1088/0022-3727/40/22/004.

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43

Karle, T. J., D. H. Brown, R. Wilson, M. Steer e T. E. Krauss. "Planar photonic crystal coupled cavity waveguides". IEEE Journal of Selected Topics in Quantum Electronics 8, n. 4 (luglio 2002): 909–18. http://dx.doi.org/10.1109/jstqe.2002.801741.

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44

Frolov, S. V., e I. Yu Popov. "Resonances for laterally coupled quantum waveguides". Journal of Mathematical Physics 41, n. 7 (luglio 2000): 4391–405. http://dx.doi.org/10.1063/1.533349.

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45

Boucher, Yann G., Florian F. L. Bentivegna e Yuliya S. Dadoenkova. "Supermodes in Coupled Bigyrotropic Slab Waveguides". IEEE Journal of Quantum Electronics 54, n. 4 (agosto 2018): 1–8. http://dx.doi.org/10.1109/jqe.2018.2842640.

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46

Poon, J. K. S., Lin Zhu, G. A. DeRose e A. Yariv. "Polymer microring coupled-resonator optical waveguides". Journal of Lightwave Technology 24, n. 4 (aprile 2006): 1843–49. http://dx.doi.org/10.1109/jlt.2006.870971.

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47

Gosciniak, Jacek, Valentyn S. Volkov, Sergey I. Bozhevolnyi, Laurent Markey, Sébastien Massenot e Alain Dereux. "Fiber-coupled dielectric-loaded plasmonic waveguides". Optics Express 18, n. 5 (26 febbraio 2010): 5314. http://dx.doi.org/10.1364/oe.18.005314.

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48

Rai, Amit, Sumanta Das e Girish Agarwal. "Quantum entanglement in coupled lossy waveguides". Optics Express 18, n. 6 (12 marzo 2010): 6241. http://dx.doi.org/10.1364/oe.18.006241.

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49

Chamorro-Posada, P. "Radiation in bent asymmetric coupled waveguides". Applied Optics 58, n. 16 (30 maggio 2019): 4450. http://dx.doi.org/10.1364/ao.58.004450.

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50

Khomeriki, Ramaz, Archil Ugulava e Levan Chotorlishvili. "Self-chaotization in coupled optical waveguides". Journal of the Optical Society of America B 25, n. 8 (16 luglio 2008): 1265. http://dx.doi.org/10.1364/josab.25.001265.

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