A5025110177- Thermal Radiation and Cooling Technologies
- Advanced Thermoelectric Materials and Devices
- Advanced Semiconductor Detectors and Materials
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Perovskite Materials and Applications
- Additive Manufacturing Materials and Processes
- Ocular Surface and Contact Lens
- Neural Networks and Reservoir Computing
- Emotional Intelligence and Performance
- Plasmonic and Surface Plasmon Research
- Advanced Sensor and Energy Harvesting Materials
- Orbital Angular Momentum in Optics
- Advanced Materials and Mechanics
- Optical and Acousto-Optic Technologies
- Mathematics and Applications
- Education and Critical Thinking Development
- Optical properties and cooling technologies in crystalline materials
- Ionosphere and magnetosphere dynamics
- Advanced Fiber Laser Technologies
- Neurobiology and Insect Physiology Research
- Geophysics and Gravity Measurements
- Chalcogenide Semiconductor Thin Films
- GNSS positioning and interference
- Metamaterials and Metasurfaces Applications
United States Air Force Research Laboratory
2023-2024
Columbia University
2018-2024
Wright-Patterson Air Force Base
2024
George Washington University
2016-2019
Photonic crystal slabs (PCSs) are a well-studied class of devices known to support optical Fano resonances for light normally incident the slab, useful narrowband filters, modulators, and nonlinear photonic devices. In shallow-etched PCSs linewidth is easily controlled by tuning etching depth. This design strength comes at cost large device footprint due poor in-plane localization energy. fully-etched realized in high index contrast material systems, greatly improved, but command over...
Broadband high reflectance in nature is often the result of randomly, three-dimensionally structured materials. This study explores unique optical properties associated with one-dimensional nanostructures discovered silk cocoon fibers comet moth, Argema mittrei. The are populated a density air voids randomly distributed across fiber cross-section but invariant along fiber. These filamentary strongly scatter light solar spectrum. A single measuring ~50 μm thick can reflect 66% incoming...
We utilize room-temperature uniaxial pressing at applied loads achievable with low-cost, laboratory-scale presses to fabricate freestanding CH3NH3PbX3 (X– = Br–, Cl–) polycrystalline ceramics millimeter thicknesses and optical transparency up ∼70% in the infrared. As-fabricated perovskite can be produced desirable form factors (i.e., size, shape, thickness) high-quality surfaces without any postprocessing (e.g., cutting or polishing). This method should broadly applicable a large swath of...
Abstract Lightweight, low‐cost metasurfaces and reflectarrays that are easy to stow deploy desirable for many terrestrial space‐based communications sensing applications. This work demonstrates a lightweight, flexible metasurface platform based on flat‐knit textiles operating in the cm‐wave spectral range. By using colorwork knitting approach called float‐jacquard directly integrate an array of resonant metallic antennas into textile, two textile reflectarray devices, lens (metalens),...
Thin-film LC based geo-phase optics have previously been demonstrated to drastically reduce size, weight, and power requirements for large-aperture optical systems while providing non-mechanical functionality discrete values – example, digital switching of the beam steering angle. In this work, we present a series Alvarez-Lohmann lens capable analog tuning focal length through lateral translation or azimuthal rotation. For circularly polarized inputs, diffraction efficiencies greater than...
In this report, we utilize room-temperature uniaxial pressing at applied loads achievable with low-cost, laboratory-scale presses to fabricate freestanding CH3NH3PbX3 (X-=Br- ,Cl-) polycrystalline ceramics millimeter thicknesses and optical transparency up ~70% in the infrared. As-fabricated perovskite can be produced desirable form factors (i.e., size, shape, thickness) high quality surfaces without any post-processing (e.g., cutting or polishing). We additionally expect method broadly...