Interactive clothing requires sensing and display functionalities to be embedded on textiles. Despite the significant progress of electronic textiles, integration optoelectronic materials fabrics remains as an outstanding challenge. In this Letter, using electro-optical tunability graphene, we report adaptive optical textiles with electrically controlled reflectivity emissivity covering infrared near-infrared wavelengths. We achieve modulation by reversible intercalation ions into graphene...

The topological structure associated with the branch point singularity around an exceptional (EP) can provide tools for controlling propagation of light. Through use graphene-based devices, we demonstrate emergence EPs in electrically controlled interaction between light and a collection organic molecules terahertz regime at room temperature. We show that intensity phase pulses be by gate voltage, which drives device across EP. Our tunable system allows reconstruction Riemann surface complex...

The control of thermal radiation by shaping its spatial and spectral emission characteristics plays a key role in many areas science engineering. Conventional approaches to tailoring using metamaterials are hampered both the limited resolution required subwavelength material structures materials' strong absorption infrared. In this work, we demonstrate an approach based on concept topology. By changing single parameter multilayer coating, were able reflection topology surface, with critical...

Thermoelectric effects on phase change memory elements are computationally analyzed through 2-D rotationally symmetric finite-element simulations of reset operation a Ge <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Sb Te xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> (GST) mushroom cell with 10-nm critical dimension. Temperature-dependent material parameters used to determine the thermoelectric contributions at junctions (Peltier...

Phase-change memory (PCM) devices are enabled by amorphization- and crystallization-induced changes in the devices' electrical resistances. Amorphization is achieved melting quenching active volume using short duration pulses (∼ns). The crystallization (set) pulse duration, however, much longer depends on cell temperature reached during pulse. Hence, temperature-dependent process of phase-change materials at device level has to be well characterized achieve fast PCM operations. A main...

During the fast switching in Ge2Sb2Te5 phase change memory devices, both amorphous and fcc crystalline phases remain metastable beyond hexagonal transition temperatures respectively. In this work, electrical properties together with crystallization times resistance drift behaviour of GST are studied using a high-speed, device-level characterization technique temperature range 300 K to 675 K.

Fabrication of supramolecular electroactive materials at the nanoscale with well-defined size, shape, composition, and organization in aqueous medium is a current challenge. Herein we report construction charge-transfer complex one-dimensional (1D) nanowires consisting highly ordered mixed-stack π-electron donor–acceptor (D–A) domains. We synthesized n-type p-type β-sheet forming short peptide-chromophore conjugates, which assemble separately into well-ordered nanofibers media. These...

Electrically tuneable high mobility charges on graphene yield an efficient electro-optical platform to control and manipulate terahertz (THz) waves. Real-world applications require a multiplex THz device with modulation over large active area. The trade-off between the gating switching speed, however, hinders realization of these applications. Here, we demonstrate large-format 256-pixel modulator which provides high-frame-rate reconfigurable transmission patterns. time-domain...

Using graphene as a tunable optical material enables series of devices such switchable radar absorbers, variable infrared emissivity surfaces, or visible electrochromic devices. These rely on controlling the charge density with electrostatic gating intercalation. In this paper, we studied effect ionic liquid intercalation long-term performance optoelectronic operating within broad wavelength range. Our spectroscopic and thermal characterization results reveal key limiting factors for process...

Peripheral nerve injuries cause devastating problems for the quality of patients' lives, and regeneration following damage to peripheral nervous system is limited depending on degree damage. Use nanobiomaterials can provide therapeutic approaches treatment injuries. Electroactive biomaterials, in particular, a promising cure defects. Here, supramolecular electroactive nanosystem with tetra(aniline) (TA)-containing peptide nanofibers was developed utilized regeneration. Self-assembled...

Aluminum, despite its abundance and low cost, is usually avoided for plasmonic applications due to losses in visible/infrared regimes interband absorption at 800 nm. Yet, it compatible with silicon CMOS processes, making a promising alternative integrated applications. It also well known that thin layer of native Al2O3 formed on aluminum when exposed air, which must be taken into account properly while designing structures. Here, the first time we report exploitation fabrication periodic...

Abstract Unlocking the potential of terahertz (THz) and millimeter (mm) waves for next generation communications imaging applications requires reconfigurable intelligent surfaces (RIS) with programmable elements that can manipulate in real-time. Realization this technology has been hindered by lack efficient THz electro-optical materials scalable semiconductor platform. Here, merging graphene-based modulators thin-film transistor (TFT) technology, we demonstrate very-large-scale (&gt;300000...

Abstract Spectrally selective thermal emission is in high demand for thermophotovoltaics, radiative cooling, and infrared sensing applications. Spectral control of the emissivity historically achieved by choosing material with suitable properties. The recent advancements nanofabrication techniques that lead to enhanced light–matter interactions enable optical properties like are not naturally available. In this study, emitters based on nanometer‐thick dielectrics field‐enhancement surfaces...

Thermoelectric transport in semiconductors is usually considered under small thermal gradients and when it dominated by the role of majority carriers. Not much known about effects that arise large can be established high-temperature, small-scale electronic devices. Here, we report a surprisingly asymmetry self-heating symmetric highly doped silicon microwires with hottest region shifted along direction minority carrier flow. We show at sufficiently high temperatures strong (~1 K/nm), energy...

Metal surfaces coated with ultrathin lossy dielectrics enable color generation through strong interferences in the visible spectrum. Using a phase-change thin film as coating layer offers tuning generated by crystallization or re-amorphization. Here, we study optical response of consisting (5–40 nm) phase-changing Ge2Sb2Te5 (GST) films on metal, primarily Al, layers. A scale ranging from yellow to red blue that is obtained using different thicknesses as-deposited amorphous GST layers turns...

Self-assembled peptide nanostructures containing π-Conjugated small molecules based on a [1]benzothieno [3,2-b]benzothiophene (BTBT) unit are shown as solution-processable semiconducting materials for potential use in tissue engineering, bioelectronics and (opto)electronics.

Infrared absorption spectroscopy has greatly benefited from the electromagnetic field enhancement offered by plasmonic surfaces. However, because of localized nature fields, such enhancements are limited to nanometer-scale volumes. Here, we demonstrate that a relatively small, but spatially uniform can yield superior infrared detection performance compared exhibited optimized nanoantennas. A specifically designed CaF2/Al thin film surface is shown enable observation stronger vibrational...

The thermal tunability of the optical and electrical properties phase-change materials has enabled decades-old rewritable data storage recently commercialized memory devices. Recently, materials, in particular, Ge2Sb2Te5 (GST), have been considered for other thermally configurable photonics applications, such as active plasmonic surfaces. Here, we focus on nonplasmonic field enhancement demonstrate use ultrasensitive infrared absorption spectroscopy platforms employing interference-based...

We report charge storage based memristive operation of a junctionless thin film flash memory cell when it is operated as two terminal device by grounding the gate. Unlike memristors on nanoionics, presented mode, which we refer to flashristor potentially allows greater control over properties, allowing rational design. The mode demonstrated using depletion type n-channel ZnO transistor grown atomic layer deposition (ALD), with HfO2 tunnel dielectric, Al2O3 and non-stoichiometric silicon...

Nanocrystalline silicon microwires are self-heated through single, large amplitude, and microsecond voltage pulses. Scanning electron micrographs show very smooth wire surfaces after the pulse compared to as-fabricated nanocrystalline texture. Voltage-pulse induced self-heating leads significant conductance improvement, suggesting crystallization of wires. The minimum resistivity during is extracted from wires different dimensions as 75.0±4.6 μΩ cm, matching previously reported values for...

Germanium antimony telluride has been the most used and studied phase-change material for electronic memory due to its suitable crystallization temperature, amorphous crystalline resistance contrast, stability of phase. In this work, segregation Ge in a Ge2Sb2Te5 film 30 nm thickness during heating inside transmission electron microscope was observed characterized. The deposited using sputtering on Protochips Fusion holder left uncapped atmosphere about four months. Oxygen incorporated...