A5065110999- Transition Metal Oxide Nanomaterials
- Laser Material Processing Techniques
- Advanced Memory and Neural Computing
- Plasmonic and Surface Plasmon Research
- Additive Manufacturing and 3D Printing Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Gas Sensing Nanomaterials and Sensors
- Electronic and Structural Properties of Oxides
- Nanofabrication and Lithography Techniques
- Metamaterials and Metasurfaces Applications
- Modular Robots and Swarm Intelligence
- Advanced Condensed Matter Physics
- Surface Roughness and Optical Measurements
- ZnO doping and properties
- Additive Manufacturing Materials and Processes
- 3D IC and TSV technologies
- Electrowetting and Microfluidic Technologies
- Adhesion, Friction, and Surface Interactions
- Semiconductor Lasers and Optical Devices
- Physics of Superconductivity and Magnetism
- Nonlinear Optical Materials Studies
- Interactive and Immersive Displays
- Magnetic properties of thin films
- Laser-Ablation Synthesis of Nanoparticles
- Ga2O3 and related materials
United States Naval Research Laboratory
2013-2022
K Lab (United States)
2013-2021
United States Navy
2017-2020
Yale University
2018
University of Leeds
2018
Paul Scherrer Institute
2018
University of Glasgow
2018
Naval Research Laboratory Materials Science and Technology Division
2018
National Academies of Sciences, Engineering, and Medicine
2017
Sensors (United States)
2016
Abstract Direct calorimetric measurements of a solid state passive switchable radiator for spacecraft thermal control have been performed in simulated space environment. Dynamic emissivity is provided by the thermochromic phase change multilayer VO 2 thin film based resonant absorber. The measured radiated power difference between 300 K and 373 was 480 W/m corresponding to 7× radiative cooling power. We present theoretical experimental values both normal hemispherical as well optical...
Information display utilizing plasmonic color generation has recently emerged as an alternative paradigm to traditional printing and technologies. However, many implementations so far have either presented static pixels with a single state or rely on relatively slow switching mechanisms such chemical transformations liquid crystal transitions. Here, we demonstrate spatial, spectral, temporal control of light using dynamic that function through the electric-field-induced alignment nanorods in...
Many emerging applications in microscale engineering rely on the fabrication of 3D architectures inorganic materials. Small-scale additive manufacturing (AM) aspires to provide flexible and facile access these geometries. Yet, synthesis device-grade materials is still a key challenge toward implementation AM microfabrication. Here, comprehensive overview microstructural mechanical properties metals fabricated by most state-of-the-art methods that offer spatial resolution ≤10 μm presented....
Abstract The discovery of low-dimensional metallic systems such as high-mobility metal oxide field-effect transistors, the cuprate superconductors and conducting interfaces ( e.g. , LaAlO 3 /SrTiO ) has stimulated research into nature electronic transport in two-dimensional given that seminal theory for disordered metals predicts state cannot exist two dimensions (2D). In this report, we demonstrate existence a metal–insulator transition (MIT) highly RuO 2 nanoskins with carrier...
By combining the enhanced photosensitive properties of zinc oxide nanoparticles and excellent transport characteristics graphene, UV-sensitive, solar-blind hybrid optoelectronic devices have been demonstrated. These offer high responsivity gain, making them well suited for photodetector applications. Here, we report a ZnO nanoparticle/graphene phototransistor that exhibits up to 4 × 104 AW−1 gain 1.3 105 with UV wavelength selectivity. were synthesized by pulsed laser fragmentation in liquid...
Abstract An ultrafast insulator–metal–insulator phase transition cycle in epitaxially strained vanadium dioxide films is observed. The are characterized by optoelectronic autocorrelation measurements that reveal a 400 fs transient change response spanning two orders magnitude. These findings suggest predominantly electronic mechanism and demonstrate the promise of this material for applications requiring fast, high‐contrast switching.
Multiscale laser patterning of indium tin oxide thin films using the combination direct interference (DLIP) and induced periodic surface structuring (LIPSS) was studied. By balancing DLIP LIPSS, structures in an ordered hierarchical pattern consisting 75 nm 650 nm DLIP, 50 µm spot size were demonstrated. The effects fluence on grain growth are discussed. anisotropic conductance due to LIPSS shown exceed 50,000:1. Infrared reflectance measurements indicated that anisotropy uniform across...
Electronic paper, or e-Paper, for use in displays has seen rapid growth the past decade because of its potential as an alternative to traditional transmissive displays. Offering several critical advantages over current display technologies, including high contrast direct sunlight, wide viewing angles, and compatibility with flexible substrate processing, electrowetting (EWDs) have made it forefront e-Paper research development efforts. Here, we describe a new design fabrication multi-color,...
We demonstrate flip-chip interconnects using laser-induced forward transfer (LIFT) of Ag nanopaste. To achieve this, nanopaste were laser printed directly onto the bond pads an RF switch. The devices bonded to test fixtures via reflow processing, eliminating need for thermocompression bonding. High frequency measurements performed on both a switch with / cured and wire-bonded After bonding, similar wirebonded switch, confirming bonding process does not degrade high performance. This result...
The combination of magnetostrictive thin films with surface acoustic wave (SAW) devices enables the magnetic sensors that exploit AE-effect (magnetically induced change in modulus) without need for free-standing structures are susceptible to vibration and damage. performance these is strongly influenced by anisotropy and, therefore, state stress film. We report fabrication characterization SAW comprised a layer interdigital transducers on piezoelectric substrate. varied annealing....
Additive manufacturing techniques such as 3D printing are able to generate reproductions of a part in free space without the use molds; however, objects produced lack electrical functionality from an applications perspective. At same time, inkjet and laser direct-write (LDW) can be used print electronic components connections onto already existing objects, but not capable generating full object on their own. The approach missing date is combination processes with circuits. Among numerous...
The development of rapid prototyping techniques for the fabrication microelectronic structures has seen growth over past decade. In particular, laser-induced forward transfer (LIFT) is a non-lithographic direct-write technique that offers advantages high speed / throughput, resolution, materials versatility, and substrate compatibility. Because degree control size shape printed material, wide range components, including interconnects, antennas, sensors, become possible using LIFT. this...
A scalable laser lithographic process has been used to striate second-generation high-temperature superconducting coated conductors manufactured with a rolling-assisted biaxially textured substrate and metal organic deposition by American Superconductor Corporation reduce ac losses for electric power applications. The involves patterning resist coating etching, which can be scaled up commercial production. results show that the critical current, I , is not degraded striation widths greater...
The field of metamaterials has expanded to include more than four orders magnitude the electromagnetic spectrum, ranging from microwave optical. While early operated in region where standard printed circuit board techniques could be applied, modern designs operating at shorter wavelengths require alternative manufacturing methods, including advanced semiconductor processes. Semiconductor methods have proven successful for planar 2D geometries limited scale. However, these are by material...
Circular arrays offer the ability to form directional beams throughout a full 360° of azimuth coverage without drawbacks beam broadening and/or scan loss. These advantages make them an attractive choice for Worldwide Interoperability Microwave Access (WiMAX) base station antenna where in any arbitrary direction facilitate range extension and throughput. In this letter, we demonstrate metal plated-on-plastic 3-D-printed circular array that provides low-cost design with simple manufacturing...
We report the dynamics and control of orientational positional order ensembles gold nanorods suspended in air at standard temperature pressure using externally applied electric fields, demonstrating an active aerosol. Light filter, valve gradient responses are shown, establishing aerosols as a unique type optical element we term component-less optics.
The geometry of magnetic flux penetration in a high temperature superconductor at buried interface was imaged using element-specific x-ray excited luminescence. We performed low observation the YBa2Cu3O7–δ (YBCO) by imaging perpendicular magnetization component square Permalloy (Py) mesostructures patterned superjacent to YBCO film. Element specific below critical reveals cross-like which is decorated regions alternating out-of-plane edges Py structures. cross structure can be attributed...
The use of laser induced forward transfer (LIFT) techniques for printing materials sensor and electronics applications is growing as additive manufacturing expands into the fabrication functional structures. LIFT capable achieving high speed/throughput, high-resolution patterns a wide range over many types substrates in flexible-hybrid electronics. In applications, sacrificial or laser-absorbing donor layer required despite fact that it can only be used once. This because various release...
Self-assembled plasmonic metasurfaces are promising optical platforms to achieve accessible flat optics, due their strong light-matter interaction, nanometer length scale precision, large area, light weight, and high-throughput fabrication. Here, using photothermal continuous wave laser lithography, we show the spectral spatial tuning of comprised a monolayer ligand capped hexagonally packed gold nanospheres. To tune response metasurfaces, that by controlling intensity focused onto...
Vanadium dioxide (VO<sub>2</sub>) undergoes a metal-insulator transition (MIT) at 68°C, which point its electrical conductivity changes by several orders of magnitude. This extremely fast (Δt < 100 fs) can be induced thermally, mechanically, electrically, or optically. The combination switching times and response to broad range external stimuli make VO<sub>2</sub> an ideal material for variety novel devices sensors. While the MIT in has been exploited microwave/terahertz...
We demonstrate spectral, spatial, and temporal control of plasmonically generated color through alignment Au nanorods by an applied electric field. Tailoring the nanorod aspect ratio enables operation across visible near-infrared spectrum.
The formation of laser-induced oxide layers on titanium surfaces has been widely investigated for coloring and marking applications. Complex titanium-based oxides exhibiting multiple phases can be achieved through laser patterning. Laser processing offers several advantages in that discrete areas modified leading to patterns with differing optical electronic properties. To date, most research focused the thickness control TiO<sub>2</sub>, a wide bandgap semiconductor (~ 3.2 eV), as means...