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Showing 1 to 17 of 17 for “"nanobeam"”.
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Low threshold organic and quantum dot nanobeam lasers
… materials and quantum dots with one dimensional nanobeam photonic crystal cavities to design lasers for the visible spectrum. We cover the theory behind generation of optical gain and lasing as well as the theory of photonic crystals. We outline a strategy for designing laser cavities using the …
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TUNING AND OPTOMECHANICS OF COUPLED PHOTONIC CRYSTAL NANOBEAM CAVITIES
… devices based on coupled photonic crystal nanobeam cavities, with studies including nano fabrication process development, device tuning with NEMS actuators, investigation of optical gradient force and tunable cavity optomechanics. High efficiency resonance tuning by electrostatically …
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The Stochastic Dynamics of Optomechanical Sensors for Atomic Force Microscopy
… important diagnostics of a mechanical resonator (nanobeam) used in cavity optomechanical sensors for atomic force microscopy. Atomic force microscopy (AFM) is a tool to image surface topology down to the level of individual atoms. Conventional AFM has been an essential tool for micro and nanoscale …
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Second Harmonic Generation in Silicon Photonic Crystal Resonators for Quantum Optic Applications
… the form of a one dimensional photonic crystal nanobeam cavity for efficient second harmonic generation.
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Toward an active CMOS electronics-photonics platform based on subwavelength structured devices
… resonator based links. Photonic crystal (PhC) nanobeam cavities can support high-quality resonance modes while confining light in a small volume, enhancing light-matter interactions and potentially enabling ultimate efficiencies in active devices such as modulators and photodetectors. However, …
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Scalable creation of spin-photon interfaces for solid-state quantum information processing
… dielectic reflectors and photonic crystal nanobeam cavities directly on the surface of bulk diamond. Our results pave the way towards a scalable network of entangled quantum registers based on spin qubits in diamond.
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Multi-Microscopy Characterisation of III-Nitride Devices and Materials
… The roughness and morphology of microdisk and nanobeam cavities was studied using FIB-tomography (FIBT), demonstrating how the dual-beam instrument may be used to access the 3D morphology of cavities down to the resolution of the SEM and the slicing thickness of the FIB. This tomography …
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A hybrid approach towards on-chip visible lasers
… and cadmium selenide nanoplatelets. We created nanobeam photonic crystal cavities that incorporate organic gain media resulting in an ultracompact low-threshold organic laser. We combined colloidal quantum dots with polymethylmethacrylate (PMMA) to create suspended polymeric cavities that showed …
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Strong Light-Matter Interaction with Cavities for Quantum Information Processing
… We illustrate the design concept with a silicon nanobeam photonic crystal cavity reaching ultrasmall mode volume that is a hundred-thousand-times smaller than the diffraction limit. In the second method, we study "magnetic" light-matter interaction in a metallic cavity. The three mode engineering …
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Nanoscale quantification of stress and strain in III-V semiconducting nanostructures
… such as convergent beam electron diffraction, nanobeam electron diffraction, and geometric phase analysis we quantify and map the strain fields in top-down fabricated InAlN/GaN high electron mobility transistor structures and GaAs/GaAsP core-shell nanowires grown by a particle-mediated …
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CRYOGENIC MICROSCOPIES OF ENERGY STORAGE MATERIALS: INSIGHTS INTO METAL ANODES, SOLID-ELECTROLYTE INTERFACES, AND MXENES
… systematic approach combining scanning electron nanobeam diffraction (SEND), TOF-SIMS, and cryo-TEM for stable cycling. This enables statistical quantification and mapping of SEI components at the micron scale with nanometer resolution, revealing critical interface characteristics that govern …
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Advanced Characterization for Studying Ni-rich Cathode Materials for Li-ion Batteries
… of the phase segregation formation mechanism, a nanobeam approach was involved. An initial operando experiment by means of scanning x-ray diffraction microscopy was carried out to probe multiple single particles and follow the Li+ heterogenities upon cycling. However, the experiment faced …
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Quantitative analysis of nanoscale order in amorphous materials by stem-mode fluctuation electron microscopy
… exciting multiple Bragg reflections when a STEM nanobeam interacts with a volume containing ordered regions in an amorphous matrix. We perform experimental analysis on several sputtered amorphous thin films including a-Si, nitrogen-alloyed GeTe and Ge2Sb2Te5. The samples contain a wide variety of …
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Quantitative analysis of crystal lattice and defects in nanoscale functional materials by electron diffraction
… of Bragg diffraction, and diffuse scattering in nanobeam diffraction. First, we develop a powerful and versatile technique for lattice strain mapping using SEND. The measurement of strain is based on determining the Bragg peak positions recorded in the diffraction patterns from a local crystal …
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New modalities of strain-based engineering of ferroelectrics: domain structure and properties of PbZr1-xTixO3 thin films
… of transmission electron microscopy-based nanobeam diffraction strain mapping and multi-dimensional band-excitation switching spectroscopy. We observe that the presence of compositional and strain gradients can preferentially stabilize highly-energetic, needle-like domains, which under …
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Three-dimensional nanostructure determination based on scanning electron nanodiffraction
Nanocrystalline materials in general feature a large density of surfaces, interphase and grain boundaries, and a large surface/volume ratio, which have attracted tremendous interest for their unique mechanical, chemical and electronic properties. For example, nanocrystalline metals and alloys …
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Physics-informed neural networks (PINNs) in nonlocal elasticity [Reti neurali Informate dalla fisica (PINNs) nell’elasticità non locale]
Questa tesi esamina l’integrazione di nanomateriali e nanostrutture sostenibili nei sistemi Micro- e Nano-Elettro-Meccanici (MEMS/NEMS), con particolare attenzione allo sviluppo di formulazioni continue non locali per strutture di piccola scala. Vengono introdotti i concetti fondamentali …