A memory cell consisting of a Pt/VO2/Pt switch element and Pt/NiO/Pt connected in series. By applying voltage higher than Vth 0.6 V, the reaches on state can be accessed. Since reset set voltages are Vth, information written by simply an appropriate to selected cell. lower other cells, we keep cells off prevent interference between others.

Although two-dimensional monolayer transition-metal dichalcogenides reveal numerous unique features that are inaccessible in bulk materials, their intrinsic properties often obscured by environmental effects. Among them, work function, which is the energy required to extract an electron from a material vacuum, one critical parameter electronic/optoelectronic devices. Here, we report large function modulation MoS2 via ambient gases. The was measured situ Kelvin probe technique and further...

We propose a design that increases significantly the absorption of thin layer absorbing material such as amorphous silicon. This is achieved by patterning one-dimensional photonic crystal (1DPC) in this layer. Indeed, coupling incident light into slow Bloch modes 1DPC, we can control photon lifetime and then, enhance integrated over whole solar spectrum. Optimal parameters 1DPC maximize wavelength range interest, up to 45% both S P polarization states instead 33% for unpatterned, 100 nm...

A novel memory cell structure with a Pt/Ti-doped NiO/Pt architecture is shown to exhibit the lowest write current reported thus far for unipolar switching resistance-change-based device, as in figure. The decreases dramatically upon scaling sizes smaller than 100 nm×100 nm. High-density universal can be fabricated by combining this node element selective switch.

Despite the direct band gap of monolayer transition metal dichalcogenides (TMDs), their optical gain remains limited because poor light absorption in atomically thin, layered materials. Most approaches to improve TMDs mainly involve modulation active materials or multilayer stacking. Here, we report a method enhance and emission MoS2 simply through design nanostructured substrate. The substrate consisted dielectric nanofilm spacer (TiO2) film. overall photoluminescence intensity from on was...

Abstract Following the proof‐of‐concept experiment in unit structure level, photonic crystal (PhC) phosphors—structurally engineered phosphor materials based on nanophotonics principles—are integrated with a blue light‐emitting diode (LED) chip to demonstrate compact and efficient white light source. Red‐ or green‐emitting CdSe‐based colloidal quantum dots (CQDs) are coated Si 3 N 4 thin‐film grating fabricate PhC phosphors. The underlying is designed such that band‐edge modes at zone center...

Measuring, recording and analyzing spectral information of materials as its unique finger print using a ubiquitous smartphone has been desired by scientists consumers. We demonstrated it drug classification chemical components with Raman spectrometer. The spectrometer is based on the CMOS image sensor periodic array band pass filters, capturing 2D intensity map, newly defined barcode in this work. Here we show 11 major drugs are classified high accuracy, 99.0%, aid convolutional neural...

We have demonstrated a compact and efficient metasurface-based spectral imager for use in the near-infrared range. The was created by fabricating dielectric multilayer filters directly on top of CMOS image sensor. transmission wavelength each channel selected embedding Si nanopost array appropriate dimensions within multilayers corresponding pixels, this greatly simplified fabrication process avoiding variation multilayer-film thicknesses. meta-spectral shows high efficiency excellent...

Recent advancements in nanotechnology raise the feasibility of a miniaturized, portable Raman spectrometer with promising applications such as material identification, food safety monitoring, and health care. Miniaturizing spectrometers has remained challenge owing to inevitable weakness signals conflict between small size spectral resolution. In this study, we present mini-Raman comprising complementary metal–oxide semiconductor (CMOS) image sensor (CIS) integrated an array filter sets,...

Abstract Metasurfaces, two-dimensional planar optical devices based on subwavelength-scale structures, have garnered significant attention for their potential to replace conventional components in various fields. These can manipulate the amplitude, phase, and polarization of light versatile ways, offering complex functionalities within a single, space-efficient device. However, enhancing functionality remains challenge, requiring an expansion design flexibility structural elements, known as...

The effects of Ni and Ni0.83Pt0.17 alloy electrodes on the resistance switching dc-sputtered polycrystalline NiO thin films were investigated. initial off-state resistances similar to that Pt∕NiO∕Pt film. However, after first cycle switching, significantly decreased in with electrode. It can be attributed migration from films. improvement data dispersion parameters is explained terms decrease effective thickness resulting Ni.

Remarkable progress in terahertz (THz) sources and detectors is followed by the necessity of manipulating radiation. Since natural materials can not perform efficient interaction with THz radiation, artificial structures called metamaterials are designed to overcome "THz gap" this area. A variety tunable using different methods control presented discussed review paper.

This study proposes a one-dimensional sub-wavelength grating structure on GaN surface which behaves as reflector for transverse-electric polarized light in the blue wavelength range. The rigorous coupled-wave analysis method was used to analyze effects of various structural parameters reflectance spectra grating. Based optimal design, (SGR) fabricated using holographic lithography and dry etching processes. It showed that exceeded 90% over 60-nm bandwidth. obtained experimental results were...

We introduce a compound-semiconductor-based omnidirectional reflector. A four-layer-pair stack of GaAs/AlAs was grown epitaxially using molecular-beam epitaxy, and then converted to GaAs/Al2O3 multilayer by selective oxidation the AlAs layers. The resultant one-dimensional photonic crystal exhibited reflection properties in near-IR wavelength range below 1 μm. Reflectance spectra measured at various incidence angles polarizations were observed be good agreement with theoretically simulated results.

We investigated systematic modulation of the Dirac point voltage graphene transistors by changing type ionic liquid used as a main gate dielectric component. Ion gels were formed from liquids and non-triblock-copolymer-based binder involving UV irradiation. With fixed cation (anion), shifted to higher size anion (cation) increased. Mechanisms for designing fully understood using molecular dynamics simulations, which excellently matched our experimental results. It was found that ion sizes...

Nanophotonics capable of directing radiation or enhancing quantum-emitter transition rates rely on plasmonic nanoantennas. We present here a novel Babinet-inverted magnetic-dipole-fed multislot optical Yagi–Uda antenna that exhibits highly unidirectional to free space, achieved by engineering the relative phase interacting surface plasmon polaritons between slot elements. The unique features this nanoantenna can be harnessed for realizing energy transfer from one waveguide another working as...

Abstract We present optical slot antennas and their applications to photonic devices. show that metallic nanoslots have the properties of a antenna by measuring transmission spectra far-field radiation patterns then prove they can be physically regarded as magnetic dipoles in region. Additionally, we generate directional radiations from adopting geometry radiofrequency Yagi-Uda properly adding auxiliary elements called reflectors directors single antenna. two cases antennas. One is...

We report on AlGaN grating reflectors for short-wavelength applications, an alternative to conventional distributed Bragg that are difficult make in a GaN-based system. An array of air-bridge reflectors, with period and filling factor 430 nm 0.55, was fabricated through holographic lithography photoelectrochemical etching. Polarization-dependent microreflectance spectra were measured confirm their consistency simulation results. The reflectance at 532 transverse-electric polarization as high...

High-density photonic integrated circuits (PICs) are expected to replace their current electronic counterparts in the future. The most crucial prerequisite for realizing successful PICs is develop a low-loss coupling technique between active and passive components based on various nanoscale materials devices. Here we propose demonstrate an on-chip integration which high-refractive-index layer constitutes coplanar structural backbone across entire PIC chip. To prove concept, patterns of...

We monolithically fabricated vertical cavity lasers with densely packed colloidal quantum dot films and demonstrated single-mode lasing operation using nanosecond optical excitation. Due to the accurate spectral spatial alignment of modes gains, in addition high quality factors our devices, we observed from a gain medium only 35 nm thick (6 or 7 monolayers thick) threshold 20 mJ/cm2. laser more numerous layers as well, which exhibited lower 9 mJ/cm2 due enhanced modal gain. This work...

Abstract Several important sensory physical quantities exist but are difficult to quantify, including food freshness. With the aid of a hyperspectral imaging system (HIS) and machine learning (ML), meat freshness is converted into measurable quantity, i.e., index (F. I.), in this study. F. I. defined from fluorescence, which has strong correlation with bacterial density, using line-scan-type HIS stimulated at 365 nm. Combined ML techniques, images processed more efficiently. By employing...

We have fabricated air-bridge type two-dimensional photonic crystal waveguides (2D-PCWs) using two high-throughput processes only: holography and photolithography. Despite the existence of misalignments a defect line with respect to air-hole arrays, waveguiding in both straight 90°-bent PCWs was clearly observed at wavelength 1.55 µm. also estimated upper bound propagation loss our PCWs, which measured be about 40 cm -1 .

A new concept of ultra-thin film photovoltaic solar cell including a planar photonic crystal is proposed. The goal to couple the incident light into broad resonances guided in absorbing layer. To achieve this, periodic lattice patterned within active layer, for example made holes amorphous silicon. By adjusting pattern dimensions, spectral position and quality factor these can be controlled so as optimise global absorption. Design details will discussed this communication.

We report the room-temperature lasing action from two-dimensional photonic crystal structures composed of a passive Si₃N₄ backbone with an over-coat CdSe/CdS/ZnS colloidal quantum dots for optical gain.