A5102785977- Photonic Crystals and Applications
- Photochemistry and Electron Transfer Studies
- solar cell performance optimization
- Microwave Engineering and Waveguides
- Optical Coatings and Gratings
- Quantum Dots Synthesis And Properties
- Thermal Radiation and Cooling Technologies
- Organic Light-Emitting Diodes Research
- Antenna Design and Analysis
- Global Education and Multiculturalism
- Radioactive element chemistry and processing
- Advanced Antenna and Metasurface Technologies
- Advanced Data Storage Technologies
- Tourism, Volunteerism, and Development
- Photonic and Optical Devices
- Caching and Content Delivery
- Service-Learning and Community Engagement
- Sensorless Control of Electric Motors
- Advanced Thermodynamics and Statistical Mechanics
- Railway Systems and Materials Science
- Gyrotron and Vacuum Electronics Research
- Interconnection Networks and Systems
- International Student and Expatriate Challenges
- Nanofabrication and Lithography Techniques
- X-ray Diffraction in Crystallography
University of Illinois Urbana-Champaign
2015-2024
China Shipbuilding Industry Corporation (China)
2021-2022
Nanjing University of Posts and Telecommunications
2019
Jingdezhen University
2012
Institute of Computing Technology
2009
Chinese Academy of Sciences
2007-2009
Shanghai University
2009
Changchun Institute of Applied Chemistry
1991
We utilize CdSe/CdS seeded nanorods as a tunable lumophore for luminescent concentration. Transfer-printed, ultrathin crystalline Si solar cells are embedded directly into the concentrator, allowing study of concentrators with an area over 5000 times cell. By increasing size CdS rod respect to CdSe seed, reabsorption propagating photons is dramatically reduced. At long luminescence propagation distances, this reduced can overcome diminished quantum yield inherent larger semiconductor...
Luminescent solar concentrators doped with CdSe/CdS quantum dots provide a potentially low-cost and high-performance alternative to costly high-band-gap III–V semiconductor materials serve as top junction in multijunction photovoltaic devices for efficient utilization of blue photons. In this study, photonic mirror was coupled such luminescent waveguide form an optical cavity where emitted luminescence trapped omnidirectionally. By mitigating escape cone scattering losses, 82% luminesced...
For decades, progress in the field of optical (including solar) energy conversion was dominated by advances conventional concentrating optics and materials design. In recent years, however, conceptual technological breakthroughs fields nanophotonics plasmonics combined with a better understanding thermodynamics photon energy-conversion processes reshaped landscape schemes devices. Nanostructured devices that make use size quantization effects to manipulate density states offer way overcome...
Escape cone loss is one of the primary limiting factors for efficient photon collection in large-area luminescent solar concentrators (LSCs). The Stokes shift luminophore, however, opens up an opportunity to recycle escaped luminescence at LSC front surface by utilizing a photonic band-stop filter that reflects photons luminophore's emission range while transmitting those its absorption range. In this study, we examine functional attributes such designs, ones realized here form distributed...
Significance Concentrator photovoltaic (CPV) systems, wherein light focuses onto multijunction solar cells, offer the highest efficiencies in converting sunlight to electricity. The performance is intrinsically limited, however, by an inability capture diffuse illumination, due narrow acceptance angles of concentrator optics. Here we demonstrate concepts where flat-plate cells mount backplanes most sophisticated CPV modules yield additive contribution overall output. Outdoor testing results...
Luminescent solar concentrators (LSCs) harness light generated by luminophores embedded in a light-trapping waveguide to concentrate onto smaller cells. LSCs can absorb both direct and diffuse sunlight, thus operate as flat plate receivers at fixed tilt with conventional module form factor. However, current experience significant power loss through parasitic luminophore absorption incomplete trapping the optical waveguide. Here, we introduce tandem LSC device architecture that overcomes of...
Materials for nanoporous coatings that exploit optimized chemistries and self‐assembly processes offer capabilities to reach ≈98% transmission efficiency negligible scattering losses over the broad wavelength range of solar spectrum from 350 nm 1.5 µm, on both flat curved glass substrates. These nanomaterial anti‐reflection also wide acceptance angles, up ±40°, s‐ p‐polarization states incident light. Carefully controlled bilayer films have allowed fabrication dual‐sided, gradient index...
Conceptual design of dual circularly polarized (CP) square loop antennas using a pair resonant even-modes for wireless sensor application is presented. A simultaneously excited within single, nonuniform element and employed to realize circular polarization characteristic. When the natural boundary conditions feed lines are matched, respectively, bidirectional CP antenna can be attained at first. Then, unidirectional designed by introducing simple metallic reflector. Both designs exhibit...
Tailored optical output, such as color purity and efficient intensity, are critical considerations for displays, particularly in mobile applications. To this end, we demonstrate a replica molded photonic crystal structure with embedded quantum dots. Electrohydrodynamic jet printing is used to control the position of dots within device structure. This results significantly less waste dot material than application through drop-casting or spin coating. In addition, targeted placement minimizes...
As part of a virtual exchange program, this mixed-method research investigated the pre-service teachers’ initial attitudes and perceptions towards global citizenship online education. In our findings,participants demonstrated cautiously optimistic attitude that they believed teaching could be effective, but more training isneeded for teachers. Moreover, participants who had Virtual Exchange (VE) experience before critical toward learning. addition, most teachers showed limited familiarity...
The power efficiency, spectral characteristics, and output directionality of light emitting diodes (LEDs) used for lighting video display may be tailored by integrating nanostructures that interact with photon emitters. In this work, we demonstrate an approach in which visible-wavelength-emitting quantum dots (QDs) are integrated within a polymer-based photonic crystal (PC) excited ultraviolet-emitting LED. PC design incorporates two interleaved regions, each distinct periods orthogonal...
It is a challenging task that enables performance isolation while providing guarantees among applications share storage infrastructure. This paper presents admission-control-based proportional allocation (APA), novel I/O request scheduler combines the admission control of worst-case resources reserved with to manage bandwidth for isolation. APA has three characteristics: 1) requests applications; 2) fairness idle resources; 3) monitoring and feedback-based weight adjustment. We implemented...
We propose a design for concentrated photovoltaic (CPV) module with features that can capture both direct and diffuse sunlight. This approach uses luminescent solar concentrator (LSC) sheet includes quantum dots, tailored optical coating enhances concentration delivery of sunlight to the micro-PV cells. In addition, light not captured by dots impinges on tandem cell beneath LSC sheet. The focuses lowering number expensive cells needed within waveguide, thus reducing system costs while...
We demonstrate a method for combining sputtered TiO2 deposition with liquid phase dip-coating of quantum dot (QD) layer that enables precise depth placement QD emitters within high-index dielectric film, using photonic crystal (PC) slab resonator to enhanced emission from the QDs when they are located at specific film. The PC is found modulate resonant wavelength as well enhancement efficiency, semiconducting material embedded changes its spatial overlap mode.
An improved design of a dual-band circularly polarized (CP) square loop antenna under even-mode resonance is presented in this paper. The designed fed by pair orthogonal dipole launcher with fork-like stubs and connected simple balun above the ground plane. Four L-shaped tuning can simultaneously excite first two, odd-order even-modes. approximate ratio formula also deduced using data fitting technique. proposed exhibits identical CP sensing at its two resonant modes. approach expected to...
This systematic review provides an overview of the empirical research relating to protective experiences transgender and gender non-conforming (TGNC) high school students. 22 studies were identified by online search which included TGNC youth. Results revealed increasing trend publication in this field after 2010, with majority these conducted U.S. The reviewed showed that interpersonal support from friends educators played a critical role shaping students' affirming experiences. In addition,...
In article number 1601992, Ralph G. Nuzzo, John A. Rogers, and co-workers demonstrate broadband anti-reflection coatings that rely on porous nanomaterials formed by self-assembly. The image shows the use of such (orange) an array lenses within a concentration photovoltaics architecture, where photons are efficiently concentrated onto underlying triple-junction solar cells, leading to efficiency enhancement ≈8%.
Quantum dots (QDs) integration into photonic devices requires varied approaches to control and modulate their emission. We demonstrate voltage-tunable PC structures with integrated QDs over suspended piezoelectric aluminum nitride thin film resonators that enhancement at MHz frequencies. When the device is actuated its resonant mechanical frequency, extracted QD emission direction likewise modulated via optical frequency of PC. Modulation uses nanometer-scale displacements, offering...
A 4-way power division feed network with 90° phase-shifting function is introduced in this paper. It works Ku full frequency band and cascaded by Wilkinson divider broadband phase shifter. The differences of the four outputs are 90°, 180° 270° respectively. HFSS software used for simulation design, then machining carried out. measured results basically consistent results: standing wave each port less than 2, error within ± 10°, insertion loss 8dB.
A photonic crystal (PC) incorporating two interleaved regions, each with distinct periods in orthogonal directions, enables simultaneous resonant coupling of ultraviolet excitation photons to quantum dots and visible emission for up 5.8X enhancement photon extraction multiple types QDs.
We demonstrate a replica molded photonic crystal structure with embedded quantum dots in which electrohydrodynamic jet printing is used to control the position of within device structure. This results significantly less waste dot material and targeted placement minimizes any emission outside resonant enhancement field, enabling an 8X output highly polarized from