Publications (12)
Linear and Nonlinear Ultra-Short Pulse Looped Antennas: Radiation and Parametric Oscillations
H. Grebel
Modern optical systems send and receive ultra-short temporal pulses (USP). While ultra-broad band antennas do exist in the microwave region (e.g., log-periodic antennas), their sho…
Optical cages made of graphitic frameworks
J. P. Walker, H. Grebel
In pursuit of infrared (IR) radiation absorbers, we examine quasicrystal structures made of graphite wires. An array of graphitic cages and cage-within-cage, and whose overall dime…
Active-carbon based supercapacitors with Au colloids: the case for placing the colloids at the electrolyte/electrode interface
H. Grebel, Shupei Yu, Yuanwei Zhang
Supercapacitors (S-C) are short-term energy storage elements that find many applications, e.g., electronic charging devices and suppressors of power fluctuations in grids that are…
The effect of periodic spatial perturbations on the emission rates of quantum dots near graphene platforms
X. Miao, D. J. Gosztola, X. Ma +3
Quenching of fluorescence (FL) at the vicinity of conductive surfaces, and in particular, near a 2-D graphene layer has become an important biochemical sensing tool. The quenching…
Optically Controlled Supercapacitors with Semiconductor Embedded Active Carbon Electrodes
H. Grebel
Supercapacitors, S-C - capacitors that take advantage of the large capacitance at the interface between an electrode and an electrolyte - have found many short-term energy applicat…
Optical Cages
V. Kumar, J. P. Walker, H. Grebel
We examine array of metal-mesh frameworks for their wide-band absorption. These take the form of quasi-crystal optical cages. An array of cages tends to focus the incoming radiatio…
Super-capacitors interfaced with quantum dots at the electrolyte/electrode interface: capacitance gain and fluorescence line-width narrowing
H. Grebel
Quantum dots (QDs), embedded in supercapacitors (S-C) cells exhibited capacitance amplification that peaked at certain QD concentration. More than 2.5 peak amplification was demons…
An Electrical Grid with Discrete Energy Levels
H. Grebel
Minimizing both power fluctuations and energy waste in an electrical grid is a central challenge to energy policy. Any discrepancy between power production and loads may lead to in…
Raman spectroscopy of active-carbon electrodes when Au colloids are placed at the electrolyte/electrode interface
H. Grebel, Y. Zhang
We use surface enhanced Raman spectroscopy (SERS) in studying functionalized Au nanoparticles (AuNPs) when incorporated in active-carbon (A-C) based super-capacitor cells. We obser…
Asymmetric supercapacitors: optical and thermal effects when active carbon electrodes are embedded with nano-scale semiconductor dots
H. Grebel
Optical and thermal effects in asymmetric supercapacitors, whose active-carbon (AC) electrodes were embedded with nano-Si (n-Si) quantum dots (QD), are reported. We describe two st…
Parametric Oscillation and amplification with gate controlled capacitor-within-capacitor
H. Grebel
A Capacitor-within-Capacitor (CWC) is a nested electronic element that has two components: the cell (e.g., the outer capacitor) and the gate (e.g., the inner capacitor). The design…
Transfer of Graphene with Protective Oxide Layers
H. Grebel, L. Stan, A. V. Sumant +4
Transfer of graphene, grown by Chemical Vapor Deposition (CVD), to a substrate of choice, typically involves deposition of a polymeric layer (typically, poly(methyl methacrylate, P…