Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Laser writing"”.
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Femtosecond laser writing in transparent materials
… high index bismuth borate glass by femtosecond laser direct writing. Broadening of the transmitted light source by as much as 500 nm was demonstrated through a waveguide with a length of 1.8 cm. Finally, passive waveguide components such as Y-splitters and directional couplers have also been …
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Thermo-responsive and electroconductive shape-memory polymer composites for useful applications
… polymers (CPs) have been produced via direct laser writing or multiphoton fabrication (using a Photonic Nanoscribe). The modified SMPs will be reported for the first time, in addition, their properties are investigated and prove insightful for potential applications of these materials.
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Femtosecond laser micro-machining and consequent self-assembled nano-structures in transparent materials
… novel developments in the field of femtosecond laser micro-machining within the bulk of transparent materials. Thanks to its unique properties, the femtosecond laser writing technique offers the potential for realizing three-dimensional multi-component photonic devices, fabricated in a single …
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Engineering and characterizing light-matter interactions in photonic crystals
… fabricating photonic crystals, including direct laser writing, interference lithography, colloidal deposition, and chemical vapor deposition. The angle-resolved characterization of photonic crystals is performed on fluorescent photonic crystals that exhibit uniquely photonic effects, which are …
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Three-dimensional metallic architectures for photonic and energy storage applications
… advanced template fabrication technique, direct laser writing, in combination with electrodeposition for chiral metamaterial applications.
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Assembly of Structures using Optical Tweezers
… studied, including approaches such as direct laser writing, direct ink writing, self assembly, and numerous others. While several of these platforms do pose unique advantages or abilities, very few approaches have the ability to efficiently fabricate three-dimensional (3D) structures that have …
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Spectrum management for high efficiency photonic devices
… textures was fabricated using 3D direct laser writing on photoresist. The fabricated samples were optically characterized and potential modifications to achieve even higher efficiencies were pointed out. Further, this thesis demonstrated a new display architecture that can alleviate …
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Paviršinių difrakcinių elementų optimizavimas ir formavimas femtosekundiniais UV lazerio impulsais /
… and high costs. With the advancement of laser technologies and the availability of femtosecond solid-state lasers, these lasers can be applied to the formation and processing of various microstructures. The radiation from such lasers has a Gaussian intensity distribution, resulting in …
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The Development of Novel Electrochemical Sensors Based on Innovative Materials
… of this thesis is devoted to the development of laser-induced graphene (LIG)-based electrochemical sensors. It explores the fabrication of three-dimensional (3D) porous laser-scribed graphene electrodes and their functionalization with conducting polymers, such as overoxidized polypyrrole, for …
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Co-Assembly Of Nanostructured Hybrid Materials For Energy Applications
… In a first example, a 308 nm pulsed XeCl excimer laser was used to induce transient melting of amorphous silicon in colloidal self-assembly-directed silica templates, which subsequently solidified into crystalline silicon nanostructures with hexagonal nonclose-packed symmetry. Subsequently, by …
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HIGH PERFORMANCE NANOPHOTONIC CAVITIES AND INTERCONNECTS FOR OPTICAL PARAMETRIC OSCILLATORS AND QUANTUM EMITTERS
… range of a high-quality on-chip (or off-chip) laser source to new wavelengths. However, parasitic effects normally limit the output power and conversion efficiency of χ(3)microring OPOs. This issue is resolved by using a microring geometry with strongly normal dispersion to suppress parasitic …
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Creation of 3-dimensional micro-optical materials
… 5 discusses our recent discovery that direct laser writing can be used inside the pores of porous silicon and porous silicon oxide, and that the local fill fraction of resist can be controlled. This method opens up great possibilities for a wide variety of micro-optics. Nearly arbitrary 3D …
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Materials and processes for the optical additive manufacturing of advanced organic/inorganic nanocomposites for the mask-less plating of insulator and semiconductor substrates, and microfluidic devices
… photopolymerization category, namely the Direct Laser Writing (TP-DLW). This technique exploits the optical, nonlinear multiphoton absorption process, and allows for the fabrication of 3D objects featuring details below the diffraction limit, down to 100 nm or even less. Here, this multi-photon …
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Nanolithography and nanoscopy methods for the study of biological samples in confined spaces
… to demonstrate the usage of 2-photon direct laser writing for the fabrication of master molds of nanofiltration chips. The system was characterized and its nanolithography capabilities, using electron microscopy and atomic force microscopy, evaluated. The fabrication process is outlined and …
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Subsurface two-photon lithography: improvements and applications
… is implemented with a porous material as the writing medium, allowing different densities of photoresist to be created within. Thus, with SCRIBE, a variety of gradient index (GRIN) optical devices can be fabricated. In this work, we explore the challenges with applying SCRIBE-written optics as …
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Advancing optical interconnects: Exploring low-loss 3D photonic waveguides, loop mirrors, and distributed Bragg reflectors
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-08-01
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Graphene Brain on a Chip Platform for the Study of Neurodegeneration
A complex network of interconnected neurons forms the brain. This network is disrupted in neurodegenerative diseases---such as Parkinson's disease (PD), and there are limited tools available to study the molecular mechanisms behind the degradation of the neuronal network. This indicates a gap in …