Zeptomole detector: A highly sensitive giant-magnetoresistive chip and FeCo nanoparticles can be used to linearly detect 600-4500 copies of streptavidin. Under unoptimized conditions, this system also detects human IL-6 with a sensitivity 13-times higher than that standard ELISA techniques.

A novel giant magnetoresistive sensor and uniform high-magnetic-moment FeCo nanoparticles (12.8 nm)-based detecting platform with minimized distance was developed for rapid biomolecule quantification from body fluids. Such a system demonstrates specific, accurate, quick detection of interleukin-6, low-abundance protein potential cancer biomarker, directly in 4 μL unprocessed human sera. This is expected to facilitate the identification validation disease biomarkers. It may eventually lead...

Ultra-large-area self-assembled mono­layers of gold nanoparticles are coated on the intrinsic silicon to boost generation electron–hole pairs upon laser illumination. As a result, larger optical modulation depth terahertz wave can be obtained by monolayer in comparison with bare silicon. service our authors and readers, this journal provides supporting information supplied authors. Such materials peer reviewed may re-organized for online delivery, but not copy-edited or typeset. Technical...

This study presents a three-layer competition-based assay for ultrasensitive detection and quantification of endoglin from unprocessed human urine samples using giant magnetoresistive (GMR) sensor high-moment magnetic nanoparticle-based biosensing technology. platform detects as few 1000 copies at concentrations low 83 fM with high specificity has three-order dynamic range. The results reveal that levels in have the potential to predict presence prostate cancer distinguish between cancers...

A detection scheme for real-time Brownian relaxation of magnetic nanoparticles (MNPs) is demonstrated by a mixing-frequency method in this paper. MNPs are driven into the saturation region low frequency sinusoidal field. high field then applied to generate signals that highly specific magnetization MNPs. These sensitive from picked up pair balanced built-in coils. The phase delays behind derived, and experimentally verified. Commercial iron oxide with core diameter 35 nm used measurement...

This article presents a <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">W</i> -band integrated transceiver (T/R) single chip based on gallium nitride (GaN) high electron mobility transistor (HEMT) technology for active electronically scanned array (AESA) applications. It integrates low-noise receiving, high-power transmitting, and transmit (Tx)–receive (Rx) switching functionalities in chip. In the transmitting mode, from 100 to 110 GHz,...

Spatial modulation of terahertz waves enabled by the charge carrier generation-recombination dynamics in semiconductor is promising for compressive sensing imaging since broadband, low-loss and enough speed (tens thousands Hertz). However, their performance significantly limited inferior depth resolution. Here, silicon was cut into small pieces packed closely arrays to shut off diffusion between them increase resolution spatial modulators. A monolayer gold nanoparticles coated on surface...

Microfiber gratings with diameters in the subwavelength scale have recently attracted much attention for developments of sensitive sensors; however, a specific structure is usually chosen sensing one parameter according to optical response. In this work, superstructure microfiber grating combined Bragg and long-period reported first time. The proposed formed by ultraviolet laser inscription femtosecond scratching techniques, which simultaneously endows unique properties two individual...

Abstract Au nanoparticle (NPs)@TiO 2 nanotube arrays (NTAs) heterostructured films with enhanced H generation rate under full spectrum were synthesized, by using a controllable and facile dip‐loading approach. Size of the NPs was well‐distributed around 7 nm, TiO NTAs found vertically aligned. Due to LSPR effect Schottky contact, as‐prepared NPs@TiO exhibited improved abilities as well photocatalytic degradation abilities. evolution obtained samples (effective area: 5.25 cm ) reached 74.56...

Perovskite quantum dots (PQDs) have attracted extensive attention for various applications due to their hallmark optoelectronic properties. However, PQD gain materials are usually needed be integrated with an external cavity acquire effective optical feedback lasing oscillation, which generally suffers from stringent fabrication procedures and the destruction of pristine performance. In this work, we propose approach realize a new class random lasers that constructed by in situ precipitating...

The characteristic absorption spectra of three positional isomers hydroxybenzoic acid are measured using a terahertz time-domain spectroscopy system (THz-TDS) in the 0.6-2.0 THz region at room temperature. Significant differences their discovered, which indicates that THz-TDS is an effective means to identify isomers. In order simulate spectra, seven molecular clusters 2-, 3-, and 4-hydroxybenzoic (2-, 4-HA) calculated DFT-D3 method. Additionally, potential energy distribution (PED) method...

Abstract Ein zeptomolarer Detektor: hoch empfindlicher Chip mit Riesenmagnetwiderstand in Kombination FeCo‐Nanopartikeln ermöglicht die lineare Detektion von nur 600–4500 Streptavidin‐Molekülen. Schon unter nichtoptimierten Bedingungen erkennt das System überdies humanes IL‐6 einer 13‐mal höheren Empfindlichkeit als ELISA‐Standardtechniken. magnified image

Graphene/silicon hybrid diodes have been proven efficient for broad-band terahertz (THz) modulation with electrical and optical stimuli. However, the optimal protocol to apply stimuli has not well-determined obtain best performance. Here, band theory of diode used analyze underlying mechanism help determine protocol. Monolayer gold nanoparticles (AuNPs) were coated on graphene/silicon enhance Both high depth (∼93%) rate (∼4.6 kHz) obtained AuNP-coated using proper method. To explore a THz...

In this paper, we demonstrate a trilayer hybrid terahertz (THz) modulator made by combining p-type silicon (p-Si) substrate, TiO2 interlayer, and single-layer graphene. The interface between Si introduced built-in electric field, which drove the photoelectrons from to TiO2, then electrons injected into graphene layer, causing Fermi level of shift higher conduction band. conductivity would increase, resulting in decrease transmitted wave. And transmission modulation was realized. We observed...

In this paper, we report a magnetic nanoparticle (MNP) detection scheme without the presence of any external field. The proposed sensor uses patterned groove structure within so that no field is needed to magnetize MNPs. An example given based on giant magnetoresistance (GMR) sensing device with spin valve structure. For structure, MNPs located inside and near free layer demonstrated under Micromagnetic simulations are performed calculate signal noise level scheme. A maximum ratio (SNR) 18.6...

A terahertz spatial modulator is the critical component for active imaging using compressive sensing. Here small silicon pieces were put in arrays on flexible polymer substrate to fabricate semiconductor modulators. By doing this, inter-diffusion of photo-generated charge carriers prevented better resolution, and flexibility achieved. Since size comparable wavelength wave, dielectric properties gap are very different from silicon, optical modulation each element large silicon. In this...

Based on GaAs PIN diode and pHEMT integrated technology, a miniature balanced limiter-low noise amplifier(LNA)chip is designed. A architecture used in this design to enhance the power capacity of limiter. The impedance matching input output optimized, which reliability chip. Current-reuse technique LNA reduce total power. This chip powered by +5V single supply, static current about 35mA, working frequency band 8GHz-12GHz, figure lower than 1.8dB, VSWR less 1.4, gain larger 24dB, at 1dB...

Abstract Phase and amplitude modulation of propagating terahertz (THz) waves in free space is essential for many rapidly developing THz technologies. Herein, an all‐optical, high‐performance, ultra‐broadband phase shifter demonstrated. Tunable shift achieved by the photothermal effect plasmonic gold nanoparticles toluene, which can induce variations refractive index toluene as temperature increases. A 270° at 1 be under a laser irradiation 2.5 W (3.9 cm −2 ) on mixture solution. Constructive...

Antiferromagnetic oxides have attracted increasing attention for their outstanding peculiarities in spintronics. Crystal lattice defects that are present antiferromagnetic can influence physical properties, such as vacancy‐induced ferromagnetism. Meanwhile, the generation and manipulation of ultrafast spin currents insulators highly desired. Although detection terahertz current pulses been realized, effect ferromagnetism on is not yet known. Herein, role nickel oxide thin films reported....