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Silicon-compatible fabrication of inverse woodpile photonic crystals with a complete band gap
摘要： Three-dimensional (3D) photonic crystals can provide access to very interesting and unique properties for ultimate control and manipulation of photons, not possible otherwise. However, widespread implementation of such photonic crystals remains elusive because the fabrication technology available today has either silicon (Si) incompatibility, poor scalability, a large number of undesired defects, challenging or impossible placement of intentional defects, or has advanced non-standard process steps available only in a few laboratories. In this work, a new methodology of fabricating 3D photonic crystals free of unintentional defects is developed. This methodology is 'truly' Si-compatible and uses techniques available in any standard fabrication facility. A broadband omnidirectional reflector on Si is demonstrated using the same method. Introduction of intentional defect sites for fabrication of 3D waveguides and optical cavities is also discussed.
关键词： Photonic Crystal,Woodpile,Broadband reflector,Band gap,Empty-space-in-Silicon
更新于2025-09-23 15:22:29
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Nanostructuring Strategies To Increase the Photoelectrochemical Water Splitting Activity of Silicon Photocathodes
摘要： Photoelectrochemical water splitting is a promising route for sustainable hydrogen production. Herein, we demonstrate a photoelectrode motif that enables a nanostructured large-surface area electrocatalyst without requiring a nanostructured semiconductor surface with the goal of promoting electrocatalysis while minimizing surface recombination. We compare the photoelectrochemical H2 evolution activity of two silicon photocathode nanostructuring strategies: (1) direct nanostructuring of the silicon surface and (2) incorporation of nanostructured zinc oxide to increase the electrocatalyst surface area on planar silicon. We observed that silicon photocathodes that utilized nanostructured ZnO supports outperformed nanostructured silicon electrodes by ～50 mV at open circuit under 1 sun illumination and demonstrated comparable electrocatalytic activity.
关键词： photocathodes,silicon nanowires,hydrogen evolution,molybdenum disulfide,zinc oxide nanowires,photoelectrochemical water splitting
更新于2025-09-23 15:22:29
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CPW-Fed Triple High Rejection Notched UWB & X-Band Antenna on Silicon for Imaging & Wireless Applications
摘要： In this paper, compact Coplanar Waveguide feed antenna covering UWB & X-Band signals (2.98GHz-13.34GHz) is presented. Antenna also offers triple notched band elimination (WiMAX: 3.40GHz-3.95GHz, WLAN: 4.50GHz-6.34GHz & Downlink Satellite System: 7.11GHz-7.802GHz) which are due to insertion of stub and etching of slots. Antenna is fabricated and characterized on silicon for imaging and wireless applications with having fractional bandwidth of 133%. The antenna offers gain, radiation efficiency and group delay between 3.26dBi-8.00dBi, 84%-92% and ≤ ±1.0ns respectively for the entire of its bandwidth. Isolation of antenna in face to face and side to side orientations are < -25dB with very less distortion presented in the transmission and reception of the signal. The radiations emitted by the antenna are observed as dipole like pattern in E-plane and omni-directional in H-plane.
关键词： radiation efficiency,Silicon,high rejection,fractional bandwidth,gain
更新于2025-09-23 15:22:29
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Layer by layer deposition of alternate carbon nanotubes and Ni films for efficient multilayer thin film temperature gauges
摘要： This study reports a novel approach for growing multilayer thin films consisting of alternate layers of carbon nanotubes (CNT) and nickel on Si (1 0 0) substrates and justifies their use in thin film temperature sensors. A low pressure chemical vapor deposition system was employed for synthesizing CNT films, while Ni films were deposited by electrodeposition. Porous-Si was used as substrate to increase adhesion between the layers of the multilayer structure. The structure of the multilayer films and the quality of the CNT grown were analyzed using several characterization methods, including scanning electron microscopy, x-ray photoelectron spectroscopy, x-ray auger electron spectroscopy and Raman spectroscopy. The electrical characteristics were investigated using a van der Pauw setup and the effect of the increasing number of CNT layers in the multilayer structure was studied. The sensitivity of the multilayer film was found to increase with increasing number of CNT layers, despite the decrease of the temperature coefficient of resistance. On the other hand, the initial resistance was found to increase. Results indicated that these multilayer structures are appropriate for fabricating highly sensitive thin film gauges that can detect lower heat fluxes with more accuracy.
关键词： carbon nanotubes,thin film gauges,surface and interface chemistry,porous silicon,adhesion sensing,x-ray photoelectron spectroscopy
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) - Ultra Low Loss Asymmetric Multimode Interference Power Splitters
摘要： Ultra low loss arbitrary-ratio multimode interference (MMI) splitters are realized by utilizing tilted tapers with minimum excess loss predicted to be 0.05dB and the maximum no more than 0.215dB. the comparison in Fig1(b), (c) and (d), the joggle phenomenon is eased by using tilted tapers and the corresponding excess loss is also reduced.
关键词： multimode interference,arbitrary-ratio power splitter,Silicon Photonics
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) - Optimization of a Polarization Beam Splitter for Broadband Operation using a Genetic Algorithm
摘要： We present a design method for a polarization beam splitter for broadband operation based on a genetic algorithm (GA). The devices are segmented into short sections, where the geometric parameters for each device are determined using a GA.
关键词： genetic algorithm,silicon photonics,directional coupler,broadband,optimization,beam splitter
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) - Electric Field Tuning of BaTiO<inf>3</inf>-on-Silicon Multi-Ring Resonators via the Pockels Effect
摘要： We demonstrate optical tuning in hybrid barium titanate-silicon photonic structures. Individual resonances of a multi-ring resonator are coalesced into a single resonance. Critically, device operation is stable in time. Our devices enable adjustable wavelength filters and offer a low power solution to compensate fabrication imperfections.
关键词： Ring resonator,Barium titanate,Silicon photonics,Pockels
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) - Subwavelength-Grating-Based 4-Channel Add-Drop Multiplexers in Silicon Photonics
摘要： We demonstrate a compact silicon photonic 4-channel optical add-drop wavelength multiplexer enabled by subwavelength-grating-based contra-directional couplers. Pass-bands of the device show on-chip insertion losses below 1.3 dB with wide 3 dB bandwidth of ~ 6.7 nm suitable for coarse wavelength division multiplexing (CWDM) in short-reach optical interconnect applications.
关键词： add-drop multiplexers,silicon photonics,subwavelength structures,contra-directional couplers
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) - On the Transfer of Quantum-Optic Pair Sources Realized on SOI Photonics to Electronic Wafers
摘要： A micro-ring assisted photon-pair engine for CWDM and DWDM emission is implemented on silicon-on-insulator technology. Coincidences in pair emission show a 95% visibility for the photonic die. Just a small degradation is observed after wafer-level transfer to a BiCMOS electronics wafer in the 1550-nm region.
关键词： Photon pair source,3D Integration,Silicon photonics,Quantum optics
更新于2025-09-23 15:22:29
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Flexible Filtering Element on SOI with Wide Bandwidth tunability and Full FSR tuning
摘要： We demonstrate a Silicon-on-Insulator flexible filtering element, relying on two serially coupled micro ring resonators equipped with three thermo-optically tuned Mach-Zehnder interferometers, acting as variable optical couplers. A single electrode configuration is adopted, enabling the low-complexity thermo-optical control of the filtering element for bandwidth and wavelength tuneability. The module's performance has been studied in detail via simulation analysis and the obtained results were verified through experimental evaluation. Wide bandwidth tunability from 9 GHz to 103 GHz is achieved with a power efficiency of 0.284 mW/GHz, while full Free Spectral Range wavelength tuning is achieved with an efficiency of 0.297 mW/GHz. Module's insertion loss lays below 3 dB.
关键词： Silicon photonics,Optical switches,Microring resonators,Bandwidth flexibility,Thermo-optic control,Wavelength division multiplexing,Optical filters
更新于2025-09-23 15:22:29