A5047522961- Diamond and Carbon-based Materials Research
- Carbon Nanotubes in Composites
- Solid State Laser Technologies
- Force Microscopy Techniques and Applications
- Advanced Fiber Laser Technologies
- Electronic and Structural Properties of Oxides
- Mechanical and Optical Resonators
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Graphene research and applications
- Memory and Neural Mechanisms
- Neuroscience and Neuropharmacology Research
- Zebrafish Biomedical Research Applications
- Molecular Junctions and Nanostructures
- Neuroscience and Neural Engineering
- Boron and Carbon Nanomaterials Research
- Fractal and DNA sequence analysis
- Graphene and Nanomaterials Applications
- Optical Coherence Tomography Applications
- Ferroelectric and Negative Capacitance Devices
- Plasmonic and Surface Plasmon Research
- Neuroscience, Education and Cognitive Function
- Axon Guidance and Neuronal Signaling
- Metal and Thin Film Mechanics
- Cognitive Science and Education Research
Technische Universität Dresden
2023
Center for Neuro-Oncology
2022
University of California, Los Angeles
2021
University of Pittsburgh
2011-2017
Because of the atomic thinness graphene, its integration into a device will always involve interaction with at least one supporting substrate, making surface energy graphene critical to real-life applications. In current paper, contact angle synthesized by chemical vapor deposition (CVD) was monitored temporally after synthesis using water, diiodomethane, ethylene glycol, and glycerol. The then calculated based on data Fowkes, Owens–Wendt (extended Fowkes), Neumann models. fresh CVD grown...
Rodent hippocampal power spectra comprise of periodic and aperiodic components. The components (brain rhythms) contain information about the behavioral or cognitive state animal. are rarely studied their functionality is not well understood, though have shown to be correlated with animal's age excitation-inhibition ratio brain region. To study these in mouse hippocampus we modified existing open-source FOOOF toolbox, which was originally optimized for EEG data. First, using simulated data,...
In this letter, we present the use of monolayer graphene saturable absorbers to produce Q-switched and mode-locked operation Yb Yb:Er-doped phosphate glass waveguide lasers, respectively. For 1535-nm-wavelength Yb:Er laser, pulses have repetition rates up 526 kHz contain at a frequency 6.8 GHz. The measured 0.44-nm bandwidth should allow as short <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\sim 6$...
In this Letter, we present a passively Q-switched Yb:Y2O3 waveguide laser using evanescent-field interaction with an atmospheric-pressure-chemical-vapor-deposited graphene saturable absorber. The waveguide, pumped by broad area diode laser, produced average output power of 456 mW at absorbed 4.1 W. corresponding pulse energy and peak were 330 nJ 2 W, respectively. No damage was observed, demonstrating the suitability top-deposited for high-power operation.
The first, to the best of our knowledge, Q-switched operation a pulsed-laser-deposited waveguide laser is presented. A clad Yb:Y2O3 was using an output coupling mirror coated with single layer graphene deposited by atmospheric pressure chemical vapor deposition. During continuous-wave operation, maximum power 83 mW at slope efficiency 25% obtained. pulses as short 98 ns were obtained repetition rate 1.04 MHz and central wavelength 1030.8 nm.
We report the development and characterization of graphene/LaAlO3/SrTiO3 heterostructures. Complex-oxide heterostructures are created by pulsed laser deposition integrated with graphene using both mechanical exfoliation transfer from chemical-vapor on ultraflat copper substrates. Nanoscale control metal-insulator transition at LaAlO3/SrTiO3 interface, achieved conductive atomic force microscope lithography, is demonstrated to be possible through layer. LaAlO3/SrTiO3-based electric field...
Mirror galvanometer systems (galvos) are commonly employed in research and commercial applications areas involving laser imaging, machining, laser-light shows, others. Here, we present a robust, moderate-speed, cost-efficient home-built galvo system. The mechanical part of this design consists one mirror, which is tilted around two axes with multiple surface transducers. We demonstrate the ability by scanning mirror using computer, via custom driver circuit. performance galvo, including scan...
While the motions of macroscopic objects must ultimately be governed by quantum mechanics, distinctive features mechanics can hidden or washed out thermal excitations and coupling to environment. We propose a system consisting graphene nanomechanical oscillator (NMO) coupled with single spin through uniform external magnetic field, which could become building block for wide range devices. The choice as NMO material is critical minimizing moment inertia oscillator. originates from...
The transfer of graphene grown by chemical vapor deposition (CVD) using amorphous polymers represents a widely implemented method for graphene-based electronic device fabrication. However, the most commonly used polymer, poly(methyl methacrylate) (PMMA), leaves residue on that limits mobility. Here we report and patterning employs perfluoropolymer---Hyflon---as handle to protect against contamination from photoresists or other polymers. CVD-grown transferred this way onto LaAlO$_3$/SrTiO$_3$...
Nitrogen-vacancy (NV) centers are defects in diamonds, which, due to their electronic structure, have been extensively studied as magnetic field sensors. Such detection applications usually employ the NV detect components aligned with direction of internally-defined spin axis center. In this work we fields which slightly misaligned center axis. particular, demonstrate that can measure square angle between and high sensitivity diverges external approaches a value pre-defined by center's...
Visual cortical neurons encode the position and motion direction of specific stimuli retrospectively, without any locomotion or task demand 1 . Hippocampus, a part visual system, is hypothesized to require self-motion cognitive generate allocentric spatial selectivity that scalar, abstract 2,3 , prospective 4–7 To bridge these seeming disparities, we measured rodent hippocampal moving bar light in body-fixed rat. About 70% dorsal CA1 showed stable activity modulation as function bar’s...
A diode-pumped Er,Yb:glass waveguide laser, Q-switched mode-locked using a graphene saturable absorber is presented. Mode-locked pulses at repetition rate of 6.8 GHz are achieved an output power 27 mW and wavelength 1535 nm.
Nitrogen-vacancy (NV) centers are defects in diamonds, which, due to their electronic structure, have been extensively studied as magnetic field sensors. Such detection applications usually employ the NV detect components aligned with direction of internally-defined spin axis center. In this work we fields which slightly misaligned center axis. particular, demonstrate that can measure square angle between and high sensitivity diverges external approaches a value pre-defined by center's...