A research in extending bandwidth of the visible light communication (VLC) system that uses phosphorescent white LED has been reported this letter. Slow response component limits modulation to lower MHz range. In letter, we present a post-equalization circuit contains two passive equalizers and one active equalizer. With blue-filtering circuit, 151 achieved our VLC system, which allows OOK-NRZ data transmission up 340 Mb/s. The link operates at 43 cm using single Watt LED, bit-error-ratio...

The thickness-dependent Raman spectra, transport properties and photoresponse (from the visible light up to communication band) of few-layer black phosphorus were studied systematically.

Graphene's remarkable electrical and optical properties afford great potential for constructing various optoelectronic devices, including modulators, photodetectors pulse lasers. In particular, graphene-based modulators were demonstrated to be featured with a broadband response, small footprint, ultrafast speed CMOS-compatibility, which may provide an alternative architecture light-modulation in integrated photonic circuits. While on-chip graphene have been studied structures, most of them...

Artificial synapses with the capability of optical sensing and synaptic functions are fundamental components to construct neuromorphic visual systems. However, most reported artificial require a combination electrical stimuli achieve bidirectional conductance modulation, leading an increase in processing time system complexity. Here, all-optically controlled synapse based on graphene/titanium dioxide (TiO

Two-terminal self-rectifying (SR)-synaptic memristors are preeminent candidates for high-density and efficient neuromorphic computing, especially future three-dimensional integrated systems, which can self-suppress the sneak path current in crossbar arrays. However, SR-synaptic face critical challenges of nonlinear weight potentiation steep depression, hindering their application conventional artificial neural networks (ANNs). Here, a memristor (Pt/NiOx/WO3-x:Ti/W) cross-point array with...

Exosomes are becoming more widely acknowledged as significant circulating indicators for the prognosis and diagnosis of cancer. Circulating exosomes essential to development spread cancer, according a growing body research. Using existing technology, characterizing is quite difficult. Therefore, direct, sensitive, targeted approach exosome detection will aid in illness prognosis. The review discusses new strategies isolation technologies from microfluidic chips nanoplasmonic biosensors,...

Abstract As a photoinduced and electro‐induced phase change material, VO 2 undergoes transition from an insulating to metallic under photoelectric stimulation, accompanied by strong lattice distortion band changes. This characteristic of simultaneously responding optical electrical signals provides basis for simulating biological vision systems, but the volatility challenges Long‐term memory neural networks. Here, transition‐regulated artificial synapse based on /graphene heterostructure is...

Reduced graphene oxide (rGO) has been studied as a resistive ammonia gas sensor at room temperature. The sensitive hybrid material composed of rGO and nano-silver ink (Ag-ink) was loaded on microstrip patch antenna to realize high-performance wireless sensors. investigated using scanning electron microscopy (SEM) X-ray photoelectron spectroscopy (XPS). Firstly, interdigital electrodes (IDEs) printed the polyethylene terephthalate (PET) by direct printing were employed measure variation...

Silicon photonic-based refractive index sensors are of great value in the detection gases, biological and chemical substances. Among them, microring resonators most promising due to their compact size narrow Lorentzian-shaped spectrum. The electric field a subwavelength grating waveguide (SWG) is essentially confined low-refractive dielectric, favoring enhanced analyte-photon interactions, which represents higher sensitivity. However, it very challenging further significantly improve...

We present dual-polarization silicon Mach-Zehnder modulators based on central-symmetric two-dimensional apodized grating couplers to address the polarization sensitivity issues of optical transmitters. For comparison, both "balanced-arm" and "unbalanced-arm" devices were fabricated characterized. The former is designed evaluate dependent loss (PDL) demonstrate broadband modulation. It features a measured PDL below 0.3 dB across C-band, fiber-to-fiber insertion (IL) about 10 dB, large...

Abstract New neuromorphic architectures and memory technologies with low power consumption, scalability high-speed are in the spotlight due to von Neumann bottleneck limitations of Moore's law. The memristor, a two-terminal synaptic device, shows powerful capabilities computing information storage applications. Active materials high defect migration speed barrier highly promising for high-performance memristors. Halide perovskite (HP) point defects (such as gaps, vacancies, inversions) have...

A high-efficiency photodetector consisting of colloidal PbS quantum dots (QDs) and single-layer graphene was prepared in this research. In the early stage, QDs were synthesized characterized, results showed that product conformed with characteristics high-quality QDs. Afterwards, derived through steps, including photolithography etching indium tin oxide (ITO) electrodes active region, as well spin coating ligand substitution After application testing, photodetector, which research, exhibited...

We propose and experimentally demonstrate an apodized bidirectional grating coupler for high-efficiency, perfectly vertical coupling. Through apodization, the coupling efficiency (CE) can be notably improved, parasitic reflections minimized. For ease of fabrication, subwavelength gratings are introduced, which also beneficial performance. Simulation shows a record CE 72%. found that is quite robust to variation incidence mode field diameter fiber misalignment. A -1.8 dB measured with 1-dB...

Abstract Semiconductor technologies make major contributions to scientific and technological improvements, enabling high‐performance low‐cost devices, chips, systems. Photolithography are at the heart of semiconductor indispensable in fabricating microstructures nanostructures. It is obvious that a new emerging material can play greater role economic development if it be processed with photolithography technologies. Halide perovskites have received an enormous amount attention, as they...

Artificial synapses based on biological represent a new idea in the field of artificial intelligence with future applications. Current two-terminal RRAM devices have developed tremendously due to adjustable synaptic plasticity synapses. However, these still some problems, such as current leakage and poor durability. Here, we demonstrate Pt/NiOx/WO3–x:Ti/W memristor pn-type heterojunction two metal–semiconductor contacts, which exhibits good rectification. Due change internal potential...

A self-organizing, nanocomposite electrode (SONE) system was developed as a model lithium alloy-based anode for rechargeable batteries. In situ X-ray adsorption spectroscopy, galvanostatic testing, cyclic voltammetry, diffraction, and transmission electron microscopy were used to analyze the electrode, which fabricated from polyethylene oxide-based block copolymer, single-walled carbon nanotubes, gold salt. Processing involved single mixing step without need of reducing agent. It found that...

Wearable technology constitutes a pioneering and leading innovation market development platform worldwide for technologies worn close to the body. optical fiber sensors have most value advanced multiparameter sensing in digital health monitoring systems. We demonstrated first example of fully integrated interrogator. By integrating all components on silicon photonic chip, we realized stable, miniaturized low-cost interrogator continuous, dynamic, long-term acquisition human physiological...

In contrast to cumbersome benchtop spectrometers, integrated on-chip spectrometers are well-suited for portable applications in health monitoring and environmental sensing. this paper, we have developed an spectrometer with a programmable silicon photonic filter by simply using parallel cascaded micro-ring resonators (MRs). By altering the transmission spectrum of filter, multiple diverse sampling input is achieved. Then, combined artificial neural network (ANN) model, incident reconstructed...

Abstract Benefit from exceptional electrical transport properties, graphene receives worldwide attentions, especially in the domain of high frequency electronics. Due to absence effective bandgap causing off-state device, material is extraordinarily suitable for analog circuits rather than digital applications. With this unique ambipolar behavior, can be exploited and utilized achieve performance multipliers. Here, dual-gated field-effect transistors have been firstly used quadrupling. Two...

A four-port grating coupler with etched square holes is proposed and demonstrated for surface-normal polarization independent coupling. Benefiting from the perfectly vertical coupling 1 × 4 power splitting/combing scheme, efficient operation was achieved. The efficiency further improved by apodization. According to simulations, 2D apodized can achieve a (CE) of 64.5% (-1.9 dB), low upward back-reflection 8.5% (-11 polarization-dependent loss (PDL) lower than 0.04 dB across wavelength range...

In this work, a bidirectional grating coupler for perfectly vertical coupling is proposed. The efficiency enhanced using silicon nitride (Si3N4) layer above uniform grating. the presence of Si3N4 layer, back-reflected optical power into fiber diminished and waveguide increased. Genetic algorithm (GA) used to optimize simultaneously. optimal design obtained from GA shows that average in-plane about 57.5% (−2.5 dB) 68.5% (−1.65 dB), meanwhile back-reflection in C band reduced 17.6% (−7.5 7.4%...