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Physical origin of higher-order soliton fission in nanophotonic semiconductor waveguides
摘要： Supercontinuum generation in Kerr media has become a staple of nonlinear optics. It has been celebrated for advancing the understanding of soliton propagation as well as its many applications in a broad range of fields. Coherent spectral broadening of laser light is now commonly performed in laboratories and used in commercial “white light” sources. The prospect of miniaturizing the technology is currently driving experiments in different integrated platforms such as semiconductor on insulator waveguides. Central to the spectral broadening is the concept of higher-order soliton fission. While widely accepted in silica fibers, the dynamics of soliton decay in semiconductor waveguides is yet poorly understood. In particular, the role of nonlinear loss and free carriers, absent in silica, remains an open question. Here, through experiments and simulations, we show that nonlinear loss is the dominant perturbation in wire waveguides, while free-carrier dispersion is dominant in photonic crystal waveguides.
关键词： nonlinear optics,Supercontinuum generation,free-carrier dispersion,soliton fission,semiconductor waveguides
更新于2025-11-28 14:24:03
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Hot wire chemical vapor deposition for silicon photonics: An emerging industrial application opportunity
摘要： In this work different silicon photonic devices, including straight waveguides, multi-mode interference devices and Mach-Zehnder interferometers, were fabricated and characterized on hot-wire chemical vapor deposition (HWCVD) silicon nitride (SiN) layers deposited at temperatures below 350 °C. These layers presented a hydrogen concentration of 13.1%, which is lower than that achieved with plasma enhanced chemical vapor deposition at these deposition temperatures. The lowest reported optical propagation losses of 6.1 dB/cm and 5.7 dB/cm, 1550 nm and 1310 respectively, for straight SiN waveguides prepared by HWCVD was measured. We demonstrated that silicon nitride SiN, prepared using HWCVD, is a viable material for silicon photonics fabrication.
关键词： Multimode interferometer,Silicon photonics waveguides,Silicon photonics,Hot wire chemical vapor deposition,Silicon nitride,Mach-Zehnder interferometer
更新于2025-11-21 11:20:42
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Scalable compact mode (de)multiplexer based on asymmetric Y-junctions
摘要： A scalable asymmetric Y-junctions waveguide mode (de)multiplexer ((de)MUX) is theoretically proposed. The high-order mode in the stem is designed to be separated from the lower-order mode and evolves into the fundamental mode in the narrow arm, through waveguide widths optimization by effective index matching and beam propagation method. Within the wavelength range from 1450 to 1630 nm, the four modes (de)MUX with small footprint of 23 × 3.2 μm2 demonstrates the insertion loss and crosstalk of less than 0.14 dB and -16 dB, respectively. This scheme may be expanded to handle more modes in (de)MUX design.
关键词： Waveguides,Integrated optics devices,Modes,Multiplexing
更新于2025-09-23 15:22:29
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[IEEE 2017 14th IEEE India Council International Conference (INDICON) - Roorkee (2017.12.15-2017.12.17)] 2017 14th IEEE India Council International Conference (INDICON) - Design and study of Cylindrical RF pill box window for 100 GHz BWO with Single side Tapered Output Coupler
摘要： The paper represents the design and implementation of a Silicon Pillar Bow Windmill used in LED output coupler at a frequency of 100 GHz with cylindrical waveguides. The design and simulation have been carried out using CST microwave studio. The designed windmill has a circular aluminum disc with a thickness of 3.19 μm and radius of 2500 μm. The circular disc is sandwiched between two circular waveguides. The designed windmill has been simulated and the return loss and insertion loss are obtained as -22.38 dB and -0.000723 dB respectively at this frequency. The designed windmill has good performance and can be used for low and medium power microwave applications.
关键词： Silicon Pillar Bow Windmill,LED output coupler,insertion loss,CST microwave studio,return loss,cylindrical waveguides
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE 15th International Conference on Group IV Photonics (GFP) - Cancun (2018.8.29-2018.8.31)] 2018 IEEE 15th International Conference on Group IV Photonics (GFP) - Photonic Bonding Modes with Circular Polarization at Zero-Group-Velocity Points
摘要： Breaking the parity symmetry of a photonic crystal waveguides can lead to the bonding of guided modes with orthogonal dominant polarizations. Here we present how this coupling allows anomalous zero-group-velocity and prominent circular polarization to emerge, which can be used to enhance uni-directional photon emission. confined aZGV points along with circular polarization points in high field intensity region. Fabricated devices in Silicon-On-Insulator (SOI) wafer confirms modes coupling and an extremely large slow-down factor[11]. This paradigm opens the way for designing outclass chiral quantum photonics circuit.
关键词： photonic crystal waveguides,circular polarization,zero-group-velocity
更新于2025-09-23 15:22:29
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A metamaterials-loaded quarter mode SIW microfluidic sensor for microliter liquid characterization
摘要： In this paper, a two concentric complementary split-ring resonators (CSRRs) loaded quarter mode substrate integrated waveguide (QMSIW) is proposed as a compact microfluidic chemical sensor for liquid characterization, demonstrated by the measurement of distilled (DI) water and ethanol liquid mixtures. The proposed sensor can detect the liquid concentration from the resonance frequency shift caused by the liquid sample flowing inside the microfluidic channel engraved on polydimethylsiloxane (PDMS). Its electrical size is only ?0.25λg. The simulated resonant frequency shifts between DI water and 100% ethanol is 1196 MHz (from 2.620 GHz to 3.816 GHz), while less than 6 μL samples are used. The experimental results have validated the possibility of the application of the proposed microfluidic structure as a chemical sensor.
关键词： micro?uidic sensor,Metamaterials,complementary split-ring resonator (CSRR),chemical sensor,substrate integrated waveguides (SIW)
更新于2025-09-23 15:21:21
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Features of electromagnetic wave propagation in two- and three-layer cylindrical dielectric waveguides
摘要： Various characteristics of electromagnetic waves propagating in two- and three-layer open-dielectric waveguide structures of cylindrical shape are studied. Parameters of wave components in separate areas of the waveguide are considered. Electrodynamic characteristics and frequency dependencies for several values of layer dielectric permittivity obtained during the study are analyzed. The corresponding graphs of dependencies are presented. The dependencies of the power flux density of transverse magnetic (TM) waves in two- and three-layer waveguide structures in the absence of field dependence on azimuthal angle are considered.
关键词： dielectric waveguides,TM waves,power flux density,electromagnetic waves,cylindrical waveguides
更新于2025-09-23 15:21:01
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[IEEE 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP) - Zatoka, Ukraine (2018.9.9-2018.9.14)] 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP) - The Theory of Anharmonic Bloch Oscillations in the Coupler from the Two Arrays of Waveguides
摘要： Using the coupled-mode method, the effects of propagation of laser radiation in a coupler of two parallel waveguide arrays are studied. It is shown that due to the composite spatial structures of each of the subsystems, the structure of the spatial distribution of radiation intensity in the subsystems is substantially complicated in the investigating system.
关键词： anharmonic Bloch oscillations,coupled mode method,array of waveguides
更新于2025-09-23 15:21:01
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Graphene on an optical waveguide: comparison of simulation approaches
摘要： Recently, unusual properties of novel two-dimensional materials like graphene have revolutionized many branches of science and technology. Adequate numerical simulations of photonic devices comprising graphene layers require new approaches or modified methods. In this paper we present comparison of results obtained with three representations of a graphene monolayer: (1) an infinitely thin sheet with a finite surface complex conductivity, (2) a thin layer of a finite thickness exhibiting uniaxially anisotropic complex permittivity, and (3) anisotropic permittivity perturbation in an infinitely small volume. Numerical solutions of rigorous dispersion equations were compared to each other and also with the results obtained with several commercial as well as proprietary software packets. Under proper conditions, all approaches provide comparable results.
关键词： Perturbation method,Volumetric method,Optical waveguides,Graphene,Boundary condition method,Numerical simulations
更新于2025-09-23 15:21:01
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[IEEE 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Rome, Italy (2019.6.17-2019.6.20)] 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Differentiation of the Laser Pulse in a Waveguide with a Bragg Grating
摘要： A novel one-port probe technique, which combines the measurements of a rectangular waveguide and coaxial probe to nondestructively yield the permittivity and permeability of a PEC-backed material, is presented. A brief description of the derivation of the theoretical probe reflection coefficients, necessary for permittivity and permeability extraction via numerical inversion, is provided. Experimental characterization results of a PEC-backed magnetic material are presented to validate the proposed approach. Error analysis is also undertaken to quantify the new technique’s sensitivity to common experimental errors.
关键词： moment methods,microwave measurements,waveguides,Integral equations,permeability measurement,uncertainty,permittivity measurement,measurement uncertainty
更新于2025-09-23 15:21:01