A5103093248- Phase-change materials and chalcogenides
- Photonic and Optical Devices
- Liquid Crystal Research Advancements
- Chalcogenide Semiconductor Thin Films
- Photonic Crystals and Applications
- Optical Coatings and Gratings
- Semiconductor Lasers and Optical Devices
- Transition Metal Oxide Nanomaterials
- Advanced Fiber Optic Sensors
- Semiconductor Quantum Structures and Devices
- Advanced Machining and Optimization Techniques
- Acoustic Wave Resonator Technologies
- Plasma Diagnostics and Applications
- Magnetic Field Sensors Techniques
- Power Transformer Diagnostics and Insulation
- Electrophoretic Deposition in Materials Science
- Ferroelectric and Piezoelectric Materials
- Advancements in Semiconductor Devices and Circuit Design
- Perovskite Materials and Applications
- Nonlinear Optical Materials Research
- High voltage insulation and dielectric phenomena
- Aerosol Filtration and Electrostatic Precipitation
- GaN-based semiconductor devices and materials
- Silicon Carbide Semiconductor Technologies
- Low-power high-performance VLSI design
University of Michigan
2015-2019
Michigan United
2017-2019
Rutgers, The State University of New Jersey
2002
This Letter presents an innovative design of electro-optical modulator using germanium telluride (GeTe) phase change material with integrated nano-heater. The refractive index and the electrical conductivity GeTe significantly as goes though crystallographic change. Amorphization crystallization is achieved Joule heating method by passing current through array metal gratings, where fills slits between lines. These also increase contrast amorphous (on) crystalline (off) phases having...
Abstract It is shown that a phase change material (PCM), germanium telluride (GeTe), when integrated into subwavelength layered optical cavity, can produce widely tunable reflective colors. the crystallization temperature (Tx) of GeTe dependent on film thickness for thin films less than ≈20 nm, which exploited color tuning. Four colors from same physical structure are demonstrated by electrical heating, through novel and thermal engineering stack includes two layers with only single joule...
This letter reports the first results on a new generation of anti-symmetric lamb-wave devices using simple solidly mounted platform AlN/Mo/Si and operating at very-high-to-super-high frequency range. AlN/Mo/Si-based resonators (SMRs) with sub-micrometer interdigitated transducers were fabricated electron beam lithography liftoff process. Plasma etching was used to etch vias in ground pads get access bottom electrode for grounding. By comparing floating, grounded, no device performances, it...
In this paper, we present an ultra-fast and high-contrast optical shutter with applications in atomic clock assemblies, integrated photonic systems, communication hardware, <i>etc</i>. The design exploits the total light absorption phenomenon a thin phase change (PC) material placed over metal layer. switches between ON OFF states by changing PC thus its refractive index. used work is Germanium Telluride (GeTe), group IV-VI chalcogenide compound, which exhibits good contrast when switching...
Three‐dimensional photonic bandgap (PBG) structures using alumina (Al 2 O 3 ) as the high permittivity material were modeled and then fabricated by Fused Deposition of Multi‐materials (FDMM) technology. A finite element method a real‐time electromagnetic wave propagation software used to simulate design layered PBG for applications in microwave frequency range. The modeling predicted 3‐D 16.5–23.5 GHz FDMM provides computer‐controlled process generate structures, allowing fabrication...
This paper introduces a new electro-optical shutter with measured transmission loss of less than 1.3 dB in the ON state and isolation ~14 OFF state. The is composed sub-wavelength metallic slits filled germanium telluride (GeTe) phase change material (PCM). serve both as waveguides for extra-ordinary optical signal nano-heaters changing GeTe. work focuses on thermal characterization GeTe amorphous crystalline states through Joule heating. As goes its transition, complex reflective index...
In this paper, a new automatic system has been proposed for critical conditions diagnosis of distribution insulators. regard, variety experiments have conducted on different types insulators under environmental conditions. Leakage current harmonics these analyzed. Fast Fourier Transform (FFT) applied leakage waveforms and results show strong correlation between third to fifth amplitude ratio regarding Therefore, (R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
This paper presents a high-contrast electro-optical modulator with record-breaking amplitude modulation index of 27 dB and forward loss < 3 at 1.5 μm. The high contrast is achieved by utilizing slit surface plasmon polariton resonances in an array gold lines filled phase change material (Germanium Telluride-GeTe). Stacking multiple layers the plasmonic grating enabled development high-index chip scale dimensions telecommunication wavelength. Coupling optical modes results such when GeTe goes...
This paper demonstrates a tunable color filter in an optical waveguide grating architecture consisting of phase change material, Germanium Telluride (GeTe). The and resonances were used to enhance the dynamic when GeTe is transitioned between its amorphous crystalline states. refractive index changes response applied heat, which results different reflected colors. Red, yellow, green colors achieved at room temperature for periods phase. When state, these orange, green, blue, respectively.
Fused Deposition of Ceramics (FDC), a Solid Freeform Fabrication technique, has been used to manufacture tube actuators with helical electrodes. It is expected that the special electroding along length tubes results in higher axial displacements since d/sub 33/ coefficient applicable as opposed 31/ radially poled tubes. A silver-palladium electrode filament solids loading 55 vol.% was developed. Two different methods deposition were fabricate electrodes either within wall or on outer surface...
This paper introduces tunable color reflectors for three primary colors (red, blue, and green) use in low power display systems employing a phase change material (PCM) using interference resonance an optical cavity. Optical index tunability of the PCM sitting on top cavity, results tuning device reflection spectrum thus permits vivid tuning. The used to achieve these was Germanium Telluride (GeTe) due its high stability. Specifically, ultra-thin films GeTe grown SiO<sub>2</sub> cavity with...
This paper introduces a tunable color reflector for use in low power display systems employing phase change material (PCM) within sub-wavelength layered structure.Optical index tunability of the PCM reflection spectrum permits vivid tuning applications.The used to achieve these results was Germanium Telluride (GeTe).Specifically, ultrathin film GeTe sandwiched between bottom metallic mirror and top Indium Tin Oxide (ITO) layer.A thick phase-shift Silicon Dioxide (SiO2) placed under enhance...
This paper reports tunable integrated photonic devices in the visible and near-infrared (NIR) regions using a phase change material, Germanium Telluride (GeTe), within sub-wavelength layered optical cavity structures. GeTe exhibits two distinct index of refraction values at its amorphous crystalline states this spectral range. Utilizing property, we demonstrate multi-color filter working range (400 nm-750 nm), achieving four colors through novel thermal engineering thin film stack that...
This paper reports for the first time a high-contrast, low-power reflective color filter employing phase change material in waveguide grating with different periods. Refractive index modulation is produced by crystallographic transition of Germanium Telluride (GeTe) using an external stimulus, such as heat. Nanostrips GeTe are used due to their reliable, fast, and reversible transitions. These thin nanostrips reduce total light absorption yield vivid, bright reflected color. Moreover, buried...