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 “"dynamic tuning"”.
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Fabrication and Dynamic Tuning of Periodic Structures From Holographic Lithography
… of lateral undulation could be controlled by tuning AR and exposure dosage. Using double-exposure through photomasks, patterns with both nanowaves and nanowalls for optical display were created.
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TUNING AND OPTOMECHANICS OF COUPLED PHOTONIC CRYSTAL NANOBEAM CAVITIES
This thesis focuses on mechanical tuning and optomechanics of photonic 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 …
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Droplet manipulation on structured shape memory polymer surface
While methods for dynamic tuning of surface wettability to manipulate water droplets have been widely explored for many applications including digital microfluidics, those based on dynamically changeable surface morphology have remained challenging to achieve. In this work, we present a structured …
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MICROSCOPIC SURFACE ELECTROCHEMICAL ACTUATORS FOR VOLTAGE-TUNABLE OPTICAL ELEMENTS
… critical to the world of photonics, theyallow dynamic tuning of the amplitude and phase of light via electric modulation of two semi reflective plates. Here, I present a novel application of a voltage-driven micro actuator technology, the surface electrochemical actuator (SEA), to work as the …
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Proton dynamics in ultrathin GdO𝑥H𝑦 films for magneto-ionics
Dynamic tuning of materials properties with simple voltage control is desirable for a variety of applications, from magnetic memory, to neuromorphic computing, to solid state pixels and optical circuit components. Metal oxides can conduct ionic current, allowing their properties and those of …
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Subthreshold leakage control techniques for low power digital circuits
… circuit techniques were also explored to provide dynamic tuning of device threshold voltages to tune out parameter and temperature variations during. the active state. This not only helps reduce active leakage currents but also improves process yields as well. A final research direction explored …
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Dynamic tailoring and tuning for space-based precision optical structures
… pose specific challenges in the areas of system dynamics and controls, uncertainty management and testing. The telescope optics must meet stringent positional tolerances in the presence of environmental and on-board disturbances, resulting in heavy demands on structural dynamics and control. In …
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Modular Implementation of Program Adaptation with Existing Scientific Codes
… for expressing adaptation strategies, develop a dynamic tuning approach for parallel programs, and support flexible runtime adaptation schemes, respectively. The applicability of the proposed approaches is demonstrated through example applications to real-world scientific software.
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Scalable and Reconfigurable True-Time Delay Line for Integrated Radio-Frequency Recurrent Neural Processors
… signal preservation along the delay line, and dynamic tuning for different carrier frequencies or true-time delay needs. A full model of the active delay line and it's integration with the RF-RNN architecture is developed in GlobalFoundaries 65-nm BiCMOS technology. The model includes delay …
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Motion design, control and implementation in robot manipulators
The dynamic performance of robots, specifically the tracking accuracy and motion duration, is influenced by both the nominal motion profile and the feedback control method employed. Three schemes are developed and experimentally tested to tackle the improvement of dynamic performance, in the …
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5G mmWave Integrated Positioning for Autonomous Vehicles in Urban Environments
… environments, weather conditions, and operating dynamics. To achieve this goal, three novel methodologies are proposed. The first methodology proposes a dynamic tuning approach for the extended Kalman filter's (EKF) covariance matrix while operating in a standalone 5G trilateration mode, where …
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Analysis and Applications of Microstructure and Holey Optical Fibers
… fibers in conjunction with the possibility of dynamic tuning offers desirable characteristics with potential applications in communications and sensing. Injecting gases or liquids in holey fibers with gratings changes their transmission characteristics. These changes may be exploited in …
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Heterogeneous parallel virtual machine: A portable program representation and compiler for performance and energy optimizations on heterogeneous parallel systems
… techniques. It uses a three step approximation tuning strategy, a combination of development-time, install-time, and dynamic tuning. Our strategy ensures software portability, even though approximations have highly hardware-dependent performance, and enables efficient dynamic approximation …
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Acoustoelectric charge transport in quasi-one-dimensional systems
… a weak counterpropagating SAW beam produces a dynamic tuning of the SAW potential. Observations of a quantized acoustoelectric current are then presented in novel etched-channel SAW devices which aff ord a more precise current by allowing better control over the channel geometry. The presently …
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Synthesis Technique of Thickness-Customizable Multilayered Frequency Selective Surface for Plasma-Based Electromagnetic Structures
… contained plasma (plasma-shells) as active tuning elements. These ceramic, gas-encapsulating shells are ideal for high-power microwave and electromagnetic pulse protection because they are rugged, hermetic, operable at extreme temperatures, and insensitive to ionizing radiation. A 2D …
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Organic devices for solid state lighting : technology and processing
… with a multitude of possible colors or even the dynamic tuning of the emission color, they are ideal solutions for advertising applications. Last but not least, OLED possess an enormous energy saving potential. It is generally acknowledged that OLED, in principle, have the capability to exceed …
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Bottom-up Self-Assembly across Hierarchies: From Triblock Terpolymers to Patchy Particles to Colloidal (Co-)Polymers
… the corona block (expansion/contraction). This dynamic tuning of the corona volume is a unique key feature of the bottom-up approach to soft patchy nanoparticles from triblock terpolymers. In a consecutive work, the AB and ABA CBBs were mixed in specific ratios prior to self-assembly by addition …
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Dimensionally reduced modeling and gradient-based design of microchannel cooling networks
… ability to perform multiple functions such as dynamic tuning of electromagnetic properties, self-healing and thermal management depending on the fluid circulated in the embedded microchannels. Recent breakthroughs in the vaporization of sacrificial component (VaSC) manufacturing technique have …
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Silicon Photonics for All-Optical Processing and High-Bandwidth-Density Interconnects
… The microring-based implementation allows dynamic tuning of the multiplexing and demultiplexing characteristic of the system which allows operation on WDM grid as well device tuning to combat intra-channel crosstalk. The characterization focuses on the first reported power penalty …
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Designer magnetoplasmonics for adaptive nano-optics
… of advanced optical nanoantennas, used to dynamically manipulate light. Among applications are nanorulers, adaptive magneto-chiral and highly transparent magneto-dielectric surfaces.