A5087611777- Mechanical and Optical Resonators
- Topological Materials and Phenomena
- Magneto-Optical Properties and Applications
- Graphene research and applications
- Photonic and Optical Devices
- Advanced Condensed Matter Physics
- Energy Harvesting in Wireless Networks
- Acoustic Wave Resonator Technologies
- Full-Duplex Wireless Communications
- Diverse Music Education Insights
- RFID technology advancements
- Advanced Antenna and Metasurface Technologies
- Diverse Musicological Studies
- Experimental and Theoretical Physics Studies
- Microwave Engineering and Waveguides
- HIV Research and Treatment
- Electromagnetic Scattering and Analysis
- Microfluidic and Bio-sensing Technologies
- Quantum optics and atomic interactions
- Music Technology and Sound Studies
- Force Microscopy Techniques and Applications
- Advanced MEMS and NEMS Technologies
- HIV/AIDS drug development and treatment
- Innovative Energy Harvesting Technologies
- Neuroscience, Education and Cognitive Function
University of Illinois Urbana-Champaign
2016-2022
Fred Hutch Cancer Center
2020
University of Washington
2020
Georgia Institute of Technology
2015
California State University, Fullerton
2010
Intel (United States)
2006
University of Wisconsin–Milwaukee
2002
Florida State University
2000
Washington University in St. Louis
1994
There is pressing urgency to understand the pathogenesis of severe acute respiratory syndrome coronavirus clade 2 (SARS-CoV-2), which causes disease COVID-19. SARS-CoV-2 spike (S) protein binds angiotensin-converting enzyme (ACE2), and in concert with host proteases, principally transmembrane serine protease (TMPRSS2), promotes cellular entry. The cell subsets targeted by tissues factors that regulate ACE2 expression remain unknown. Here, we leverage human, non-human primate, mouse...
Topological insulators in the spotlight In addition to having an insulating interior while at same time supporting conducting surface states, topological have many other interesting properties. Higher-order where regions of interest are along edges and corners, been difficult identify unambiguously. Peterson et al. developed a theoretical framework help characterize these exotic including new marker—the fractional charge density—that can be used detect states matter when spectroscopic probe...
Abstract The transport of energy through 1-dimensional (1D) waveguiding channels can be affected by sub-wavelength disorder, resulting in undesirable localization and backscattering phenomena. However, quantized disorder-resilient is observable the edge currents 2-dimensional (2D) topological band insulators with broken time-reversal symmetry. Topological pumps are able to reduce this higher-dimensional insulator phenomena lower dimensionality utilizing a pumping parameter (either space or...
Backscatter modulation in radio frequency identification (RFID) tags will potentially connect billions of tomorrow's devices to the Internet-of-Things. Current passive RFID systems have power constraints that limit tag communication short ranges, but these limitations can be overcome by employing reflection amplifiers. In this paper, we show negative differential resistance devices, such as tunnel diodes, exhibit 27 dB more gain and 10 lower consumption than state-of-the-art Two 5.8 GHz...
Erratic bit phenomena have been reported in advanced flash memories, and attributed to trapping/detrapping effects that modify the threshold voltage. This paper describes for first time observance of erratic behavior SRAM Vmin, defined as minimum voltage at which array is functional. Random telegraph signal (RTS) noise soft breakdown gate leakage shown be cause. The Vmin phenomenon can eliminated 90 nm SRAMs by process optimization. However, gets worse with smaller cell sizes represents...
The bulk-boundary correspondence, which links a bulk topological property of material to the existence robust boundary states, is hallmark insulators. However, in crystalline materials presence states insulating gap not always necessary since they can be hidden energy bands, obscured by artifacts non-topological origin, or, case higher-order topology, gapped altogether. Crucially, such systems interplay between symmetry-protected topology and corresponding symmetry defects provide variety...
In this paper, we present a 5.8 GHz RFID tag equipped with high gain, low power reflection amplifier based on tunnel diode. Experimental results show that the realized prototype achieves gains above 40 dB and requires only 29 μW of biasing power. The detects very RF signals (<; -90 dBm) provides read ranges up to 2 km. Long communication Manchester encoding are achieved by off
We study nonreciprocity in spatiotemporally modulated 1D resonator chains from the perspective of equivalent 2D arrays with a synthetic dimension and transverse electric magnetic fields. The fields are respectively related to temporal spatial modulation chain, we show that their combination can induce strong transmission nonreciprocity, i.e., complete isolation only weak perturbative modulation. This nonreciprocal effect is analogous Hall for charged particles. experimentally implement two...
We demonstrate a synthetic Hall effect for light, using an acousto-optically modulated nanophotonic resonator chain. To produce this effect, we simultaneously generate the required electric field temporal modulation and magnetic spatial of show how combination these fields transverse to direction light propagation can be used non-reciprocal optical transmission, as basis new photonic topological devices.
RFID applications have power constraints that limit RF tags to short range communications. This article presents the design procedures, validated by experimental results, make a low-powered reflection amplifier exploits quantum mechanical tunneling effect dramatically enhance of passive or semi-passive tags. A return gain 34.4 dB with bias 45 μW at 5.45 GHz and 22.1 47 5.55 been observed for impinging levels as low -70 dBm. These results allow, certain devices, factor 7 improvement link...
Integrating magnets into resonant mechanical systems allows for intriguing capabilities, such as the ability to tune resonance frequency or induce coupling between resonators without any physical contact. Here, we present analytical models well experimental study of an integrated magneto-mechanical system. Using a point dipole approximation, explore magneto-static spring effect, which can either soften stiffen depending on orientation and spatial position magnets. We use translational...
High-Q optical resonators allow label-free detection of individual nanoparticles through perturbation signatures but have practical limitations due to reliance on random diffusion deliver particles the sensing region. We recently developed microfluidic optomechanical that free-flowing in fluid media with near perfect efficiency, without requiring labeling, binding, or direct access mode. Rapid single is achieved a long-range interaction which modification resonator vibrational modes during...
Wavelike spatiotemporal modulation of discrete coupling elements creates synthetic phonons that enable nonreciprocal coupling.
The ability to apply knowledge rests at the core of educational experience and is an important aspect all teaching. In music education, many experiences are structured so information gained can be related another activity, but such transfer difficult. When students learn new situations, they more likely retain that knowledge; this retention seems enhanced when presented within activity where creativity encouraged. There also evidence support a technique teacher clearly states goal for...
A model has been developed through closed-form equations which simply determines the theoretical output power and energy-conversion efficiency for an RF-to-dc energy harvesting circuit with N rectifying elements. This improves on previous works are limited to evaluating circuits only a single element or frequency excitation. Validation obtained simulation of ideal components show good agreement harvesters up 6 diodes along measurements 5.8 GHz voltage doubler within 5.6%. The relationships...
We demonstrate a synthetic Hall effect for light, using an acousto-optically modulated nanophotonic resonator chain. To produce this effect, we simultaneously generate the required electric field temporal modulation, and magnetic spatial modulation of show how combination these fields transverse to direction light propagation can be used non-reciprocal optical transmission, as basis new photonic topological devices.
Resonators are a common feature of many electromagnetic filters, and when side-coupled to waveguide can be used as band-stop or notch filter. The coupling their resonant modes is extremely important the function these devices but often overlooked an opportunity for design. It has recently been shown that through spatiotemporal modulation multiple couplers between single-mode resonator it possible couple only waves traveling in one direction [1]. This "nonreciprocal coupling" create...