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[IEEE 2018 IEEE International Ultrasonics Symposium (IUS) - Kobe, Japan (2018.10.22-2018.10.25)] 2018 IEEE International Ultrasonics Symposium (IUS) - Suppression of Propagation Losses in TC SAW Resonators Using Thin Plates of LiTaO3 Bonded to Quartz Substrates
摘要： Suppression of Propagation Losses in Thin-Film Lithium Niobate Optical Waveguides
关键词： Lithium Niobate,Thin-Film,Optical Waveguides,Quasi-Phase Matching,Propagation Losses
更新于2025-09-19 17:15:36
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Efficient coupling of light from dielectric to HIMI plasmonic waveguide
摘要： This is the ?rst report on the investigation of a hybrid plasmonic tapered coupler injecting light ef?ciently from conventional dielectric waveguide to a hybrid insulator–metal–insulator (HIMI) plasmonic waveguide. The proposed structure gives high transmission ef?ciency and suppresses the re?ection losses signi?cantly. With this tapered coupling mechanism, maximum transmittance and return loss of 98% and 26 dB have been observed, respectively. The coupler also offers very good propagation length (274 μm) along with minimal mode propagation losses (0.016 dB/μm). Apart from that, it offers decent con?nement of light in low dielectric regions up to 32%. The proposed structure is designed in an ultra-short tapered length of 1.0 μm, and the entire structure occupies a footprint area of 1.4 × 2.4 μm2. Proposed hybrid waveguide coupler could be useful for several chip scale applications.
关键词： chip scale applications,light confinement,hybrid plasmonic tapered coupler,propagation length,mode propagation losses,reflection losses,HIMI plasmonic waveguide,transmission efficiency
更新于2025-09-16 10:30:52
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Low-Loss Waveguides by Planar Modified Chemical Vapor Deposition
摘要： We present a novel method to fabricate planar photonic devices for high power applications using Modified Chemical Vapor Deposition (MCVD) technology. The MCVD process, usually applied to optic fibers, is used here to deposit a layer of Ge doped silica on a fused silica slab. The doped layer was then heat-treated by a CO2 laser in order to achieve high optical quality and increase its damage threshold. Finally, direct laser lithography, followed by deep dry etching, was used to shape straight and curved large-core air-cladded waveguides with smooth sidewalls. The straight waveguides were shown to have an excellent propagation loss, 0.33 dB/cm, and the curved waveguide had a propagation loss of 1 dB/cm.
关键词： Propagation losses,Optical waveguides,Germanium doped silica
更新于2025-09-16 10:30:52
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Mode-crossing spectroscopy for photonic waveguide characterization
摘要： We report a novel spectroscopic technique to characterize photonic waveguides over more than an octave of wavelength. The technique, called mode-crossing spectroscopy, uses a broadband source and a spectrometer that are coupled to the input and output ends of a series of straight dielectric waveguides via single-mode optical fibers. Measurements of the wavelengths at which multiple modes are degenerate in a single waveguide enable the determination of the refractive index of the core, as well as the waveguide width variation. In addition, mode-dependent losses are reported from 700 nm to 1550 nm using waveguides of varying lengths. The core refractive indices are measured within an error of ±0.5%, waveguide width variation to an accuracy of less than 5 nm, and waveguide propagation losses within an error of ±0.5 dB/cm. Ultrabroadband in situ measurements of loss and index over an octave of bandwidth are crucial for the accurate characterization of photonic integrated circuits and devices, especially those based on precision broadband couplers, interferometers, and resonant cavities.
关键词： propagation losses,mode-crossing spectroscopy,photonic waveguides,waveguide width variation,refractive index
更新于2025-09-16 10:30:52