A5081483589- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- Force Microscopy Techniques and Applications
- Photonic and Optical Devices
- Advanced Antenna and Metasurface Technologies
- Nanowire Synthesis and Applications
- Optical Coatings and Gratings
- Advancements in Photolithography Techniques
- Advanced Sensor and Energy Harvesting Materials
- Acoustic Wave Resonator Technologies
- Thermal Radiation and Cooling Technologies
- Semiconductor materials and devices
- Atomic and Subatomic Physics Research
- Nanofabrication and Lithography Techniques
- Microfluidic and Capillary Electrophoresis Applications
- Photonic Crystals and Applications
- Semiconductor Lasers and Optical Devices
- Quantum optics and atomic interactions
- Thermal properties of materials
- Electron and X-Ray Spectroscopy Techniques
- Graphene research and applications
- 2D Materials and Applications
- Diamond and Carbon-based Materials Research
Argonne National Laboratory
2016-2025
Center for Nanoscale Materials
2011-2019
Center for Nanoscale Science and Technology
2016
Sandia National Laboratories
2004-2013
University of Wisconsin–Madison
2013
North Carolina State University
2010
Radiology Associates of Albuquerque
2010
Northeastern University
2010
Sandia National Laboratories California
2004-2009
Office of Scientific and Technical Information
2004-2007
We have used a nonlithographic deposition process to form single polymeric nanowire chemical sensors. Oriented polyaniline nanowires, with diameters on the order of 100 nm, were deposited gold electrodes. The devices showed rapid and reversible resistance change upon exposure NH3 gas at concentrations as low 0.5 ppm. well-defined single-wire geometry allows for characterization wire material device response. response times sensors various correspond radius-dependent differences in diffusion...
The ability to detect small amounts of materials, especially pathogenic bacteria, is important for medical diagnostics and monitoring the food supply. Engineered micro- nanomechanical systems can serve as multifunctional, highly sensitive, immunospecific biological detectors. We present a resonant frequency-based mass sensor, comprised low-stress silicon nitride cantilever beams detection Escherichia coli (E. coli)-cell-antibody binding events with sensitivity down single cell. involved...
We have demonstrated high-sensitivity detection of bacteria using an array bulk micromachined resonant cantilevers. The biological sensor is a micromechanical oscillator that consists silicon-nitride cantilevers with immobilized antibody layer on the surface resonator. Measured frequency shift as function additional cell loading was observed and correlated to mass specifically bound Escherichia coli O157:H7 cells. Deposition subsequent E. cells achieved under ambient conditions.
Broadband perfect absorber based on one ultrathin layer of the refractory metal chromium without structure patterning is proposed and demonstrated. The ideal permittivity for achieving broadband absorption derived impedance transformation method. Since matches this well in visible near-infrared range, a silica-chromium-silica three-layer fabricated to demonstrate absorption. experimental results under normal incidence show that above 90% over wavelength range 0.4-1.4 μm, measurements angled...
We present a method for controlled deposition of oriented polymeric nanofibres. The uses microfabricated scanned tip as an electrospinning source. is dipped in polymer solution to gather droplet source material. A voltage applied the causes formation Taylor cone, and at sufficiently high voltages, jet extracted from droplet. By moving relative surface, acting counter-electrode, nanofibres can be deposited integrated with surface structures. For example, we fibres polyethylene oxide diameters...
Abstract Energy dissipation is an unavoidable phenomenon of physical systems that are directly coupled to external environmental bath. In oscillatory system, it leads the decay oscillation amplitude. situations where stable oscillations required, energy dissipated by vibrations usually compensated replenishment from sources. Consequently, if supply removed, amplitude start immediately, since there no means restitute dissipated. Here, we demonstrate a novel engineering strategy can support...
We report a structural color printing platform based on aluminum plasmonic metamaterials supporting near perfect light absorption and narrow-band spectral response tunable across the visible spectrum to realize high-resolution, angle-insensitive with high purity saturation. Additionally, fabricated can be protected by transparent polymer thin layer for ambient use further improved performance. The demonstrated offers great potential relevant applications such as security marking information storage.
We realize a Λ system in superconducting circuit, with metastable states exhibiting lifetimes up to 8 ms. exponentially suppress the tunneling matrix elements involved spontaneous energy relaxation by creating "heavy" fluxonium, realized adding capacitive shunt original circuit design. The device allows for both cavity-assisted and direct fluorescent readouts, as well state preparation schemes akin optical pumping. Since transitions between are strongly suppressed, we utilize Raman coherent...
Wavelength-selective metamaterial absorbers in the mid-infrared range are demonstrated by using multiple tungsten cross resonators. By adjusting geometrical parameters of resonators single-sized unit cells, near-perfect absorption with single peak tunable from 3.5 µm to 5.5 is realized. The combination two, three, or four different sizes one cell enables broadband at range. obtained spectra exhibit omnidirectionality and weak dependence on incident polarization. underlying mechanism further...
We demonstrate a novel response of nonlinear micromechanical resonator when operated in region strong, mode coupling. The system is excited with single drive signal and its characterized by periodic amplitude modulations that occur at timescales based on parameters. the are consequence coupling responsible for emergence "frequency-comb" regime spectral response. By considering generic model 1∶3 internal resonance, we behavior results from saddle node an invariant circle (SNIC) bifurcation....
Chirality plays an essential role in the fields of biology, medicine and physics. However, natural materials exhibit very weak chiroptical response. In this paper, near-infrared chiral plasmonic metasurface absorbers are demonstrated to selectively absorb either left-handed or right-handed circularly polarized light for achieving large circular dichroism (CD) across wavelength range from 1.3 µm 1.8 µm. It is shown that maximum absorption can reach 0.87 CD around 0.70. The current design able...
Most chiral metamaterials and metasurfaces are designed to operate in a single wavelength band with certain circular dichroism (CD) value. Here, mid-infrared metasurface absorbers selective CD dual-wavelength bands demonstrated. The dual-band selectivity tunability the enabled by unique design of unit cell two coupled rectangular bars. It is shown that sign each can be independently controlled flipped simply adjusting geometric parameters, width length, vertical mechanism selection absorber...
An open question in mechanics is whether mechanical resonators can be made nonlinear with vibrations approaching the quantum ground state. This requires engineering a nonlinearity far beyond what has been realized thus far. Here we discovered mechanism to boost Duffing by coupling of nanotube resonator single-electron tunneling and operating system ultrastrong regime. Remarkably, thermal become highly when lowering temperature. The average vibration amplitude at lowest temperature 13 times...
Sodium (Na) is predicted to be an ideal plasmonic material with ultralow optical loss across visible near-infrared (NIR). However, there has been limited research on Na plasmonics. Here we develop a scalable fabrication method for nanostructures by combining phase-shift photolithography and thermo-assisted spin-coating process. Using this method, fabricated nanopit arrays varying periodicities (300-600 nm) tunable surface plasmon polariton (SPP) modes spanning NIR. We achieved SPP resonances...
Optical phase-change materials exhibit tunable permittivity and switching properties during phase transition, which offers the possibility of dynamic control optical devices. Here, a wavelength-tunable infrared chiral metasurface integrated with material GST-225 is demonstrated designed unit cell parallelogram-shaped resonator. By varying baking time at temperature above transition GST-225, resonance wavelength tuned in range 2.33 µm to 2.58 µm, while circular dichroism absorption maintained...
Optical metasurfaces provide novel solutions to label-free biochemical sensing by localizing light resonantly beyond the diffraction limit, thereby selectively enhancing light-matter interactions for improved analytical performance. However, high-Q resonances in are usually achieved reflection mode, which impedes metasurface integration into compact imaging systems. Here, we demonstrate a platform advanced based on physics of bound states continuum (BIC) and electromagnetically induced...
Etch resistance of two commonly used lithography resists is increased significantly by sequential infiltration synthesis (SIS). Exposing films to trimethyl-aluminum and water with long dosage times infiltrates the bulk film alumina, which renders them dramatically more resistant plasma etching no degradation patterns. Enhanced etch eliminates need for an intermediate hard mask concomitant costs pattern fidelity losses. Moreover, allowing thinner resist films, this approach can improve final...
We present lifetime limitations and failure analysis of many packaged RF MEMS ohmic contacting switches with Au–Au, Au–Ir, Au–Pt contact materials operating 100 μN force per in hermetically sealed glass wall packages. All metals were tested using the same switch design a controlled environment to provide comparison between performance different their corresponding mechanisms. The lifetimes varied from several hundred cycles 200 million mechanisms causing failures for materials. Switches...
In this paper, we describe the optimization of transition-edge-sensor (TES) detector arrays for thirdgeneration camera South Pole Telescope.The camera, which contains ∼16 000 detectors, will make high-angular-resolution maps temperature and polarization cosmic microwave background.Our key results are scatter in transition Ti/Au TESs is reduced by fabricating on a thin Ti(5 nm)/Au(5 nm) buffer layer thermal conductivity legs that support our islands dominated SiOx dielectric microstrip...
Chronic cranial window (CCW) is an essential tool in enabling longitudinal imaging and manipulation of various brain activities live animals. However, active CCW capable sensing the concealed vivo environment while simultaneously providing optical access to not currently available. Here we report a disposable ultrasound-sensing (usCCW) featuring integrated transparent nanophotonic ultrasonic detector fabricated using soft nanoimprint lithography process. We optimize sensor design associated...
Three-dimensional confinement allows semiconductor quantum dots (QDs) to exhibit size-tunable electronic and optical properties that enable a wide range of opto-electronic applications from displays, solar cells bio-medical imaging single-electron devices. Additional modalities such as spin valley can provide further degrees freedom requisite for information spintronics. When seeking combine these material features into QD structures, however, cause hybridization inhibits the robustness...
This article introduces in archival form the Nanolithography Toolbox, a platform-independent software package for scripted lithography pattern layout generation.The Center Nanoscale Science and Technology (CNST) at National Institute of Standards (NIST) developed Toolbox to help users CNST NanoFab design devices with complex curves aggressive critical dimensions.Using parameterized shapes as building blocks, allows rapidly nanoscale arbitrary complexity through scripting programming.The...
The dynamic response of a nonlinear resonator in the presence resonant mode coupling is studied experimentally and theoretically. For case clamped-clamped beam 1:3 internal resonance, we show that at onset steady state oscillations cannot be sustained. At higher drive levels, stable can maintained but amplitude undergoes modulated responses. We use these responses to build bifurcation diagram described remarkably well with simple model consisting Duffing coupled linear one.
Abstract Conventional metasurfaces have demonstrated efficient wavefront manipulation by using thick and high-aspect-ratio nanostructures in order to eliminate interactions between adjacent phase-shifter elements. Thinner-than-wavelength dielectric are highly desirable because they can facilitate fabrication integration with both electronics mechanically tunable platforms. Unfortunately, their constitutive elements exhibit strong electromagnetic coupling neighbors, the design requires a...