A novel magnetic field sensor comprising a photonic crystal fiber (PCF) is designed and investigated based on surface plasmon resonance (SPR). We use finite element analysis in order to analyze the sensing characteristics of sensor. The simulation results show that very sensitive change refractive index has good linearity range from 1.43–1.45. thickness metal film material great influence wavelength peak loss spectrum, diameter central air hole will affect SPP excitation. When gold layer 50...

<title>Abstract</title> The dual-fiber optical tweezers have become widespread in trapping, assembling, and sensing due to their simple fabrication process flexible operation. However, the miniaturization integration of displacement measurement paths remain challenging. Here, we propose experimentally demonstrate an structured-light (SLD) method tailored for tweezers. A key component split-waveplate is integrated onto fiber end via coating etching SLD method. etched another single mode form...

Abstract The dual-fiber optical tweezers have become widespread in trapping, assembling, and sensing due to their simple fabrication process flexible operation. However, the miniaturization integration of displacement measurement paths remain challenging. Here, we propose experimentally demonstrate an structured-light (SLD) method tailored for tweezers. A key component split-waveplate is integrated onto fiber end via coating etching SLD method. etched another single mode form tweezers, which...

Abstract We present the first in situ observations of a small‐scale flux rope locally formed at separatrix region magnetic reconnection without large guide field. Bidirectional electron beams (cold and hot beams) density cavity accompanied by intense wave activity substantiate crossing region. Density compression one parallel beam are detected inside rope. suggest that this is generated due to tearing instability within current layer. This observation sheds new light on 3‐D picture space plasma.

A two-dimensional (2-D) array with a small pitch (approximately 0.5λ in medium) can achieve complete 3-D control of ultrasound beams without grating lobes and enable the generation multiple focal spots simultaneously, which is desired tool for noninvasive therapy. However, large electrical impedance 2-D elements owing to their size results low energy transfer efficiency between an system, thereby limiting practical applications. This article presents development 1-MHz 256-element ultrasonic...

In this paper, a triple-band hybridization coherent perfect absorber based on graphene metamaterial is proposed, which consists of concentric nanorings with different sizes and metallic mirror separated by SiO2 layer. Based the finite-difference time-domain (FDTD) solution, absorption achieved at frequencies from 0.6 THz to 1.8 THz, results surface plasmon resonance hybridization. The wavelength peak can be rapidly changed varying Fermi level graphene. Most importantly, independently tuned...

In this paper, we report a novel and compact sensor based on an optic microfiber coupler interferometer (OMCI) for seawater salinity application. The OMCI device is fabricated by connecting Faraday rotating mirrors to the two out-ports of coupler, respectively. signal processing wavelength demodulation technique. We theoretically analyze sensing characteristics with different structure parameters. Besides, results show that date reading error decreases thinner waist region longer arm...

Displacement measurement using a D-shaped mirror is key technology in optical tweezers, which have emerged as an important tool for precision measurement. In this paper, we first study the influences of installation errors on displacement The calibration factor and sensitivity different parameters are quantified. results show that variation obeys cosine curve with angle error, increases exponentially translation error. Besides, find error will also lead to crosstalk between transverse axial...

Abstract In this paper, we combine inverse design concept and direct binary search algorithm to demonstrate three ultra-compact high efficiency low crosstalk on-chip integrated optical interconnection basic devices in the entire wavelength range of 1,400–1600 nm based on silicon-on-insulator platform. A 90-degree waveguide bend with a footprint only 2.4 × μm 2 is designed, whose transmission up 0.18 dB. crossing which can provide insertion loss less than 0.5 dB (CL) lower − 19 same direction...

Abstract With the rapid development of high power microwave (HPM) technologies, HPM devices with several output frequencies are becoming more and attractive. Diplexer is a device two frequencies, here, an L/X band diplexer novel structure tried to be employed in system. In order obtain same radiation direction for L X microwaves diplexer, reflection transmission realized by array irises. To required performance, width thickness irises distance between them should well chosen. The...

The realization of the electromagnetically induced transparency (EIT) effect based on guided-mode resonance (GMR) has attracted a lot attention. However, achieving multispectral EIT in this way not been studied. Here, we numerically realize double EIT-ike with extremely high Q factors GMR system double-bar dielectric grating structure, and can reach 35,104 24,423, respectively. Moreover, wavelengths two peaks be flexibly controlled by changing corresponding structural parameters. figure...

High-resolution displacement detection can be achieved by analyzing the scattered light of trapping beams from particle in optical tweezers. In some applications where and detecting must separated, a beam introduced for independent measurement. However, focus possibly deviates center particle, which will affect performance detection. Here, we detect utilizing forward particle. The effects lateral axial offsets between on are analyzed simulation experiment. These results show that decrease...

A low-power CMOS voltage reference with active-feedback frequency compensation is proposed for power-constrained IoT applications whereby power supply ripple rejection (PSRR) performance critical the survival of devices. The consists MOS transistors operating in sub-threshold region to allow low-voltage and operations. An technique has been used make loop stable improve PSRR a very small capacitor while allowing relatively large output capacitor. circuit fabricated standard 0.18-μm process....

In recent years, the achievement of electromagnetically induced transparency (EIT) effect based on guided-mode resonance (GMR) has attracted extensive attention. However, few works have achieved a double EIT-like using this method. paper, we numerically achieve in GMR system with three-layer silicon nitride waveguide grating structure (WGS), multi-level atomic model for theoretical explanation. terms slow light performance, corresponding two delay times reach 22.59 ps and 8.43 ps,...

In this paper, a current-mode bandgap reference (BGR) circuit with cascode current mirrors and improved frequency compensation for achieving high power supply ripple rejection (PSRR) is presented. By slightly modifying conventional scheme, the PSRR of BGR significantly enhanced. PSRRs two different techniques have been formulated. To our knowledge, first time in literature explicitly demonstrating how due to compensation. The feedback loop stability also analyzed. simulated an example using...

This paper presents an ultra-low temperature coefficient sub-threshold voltage reference, which is based on a novel compensation principle without using any resistors or operational amplifiers. Being implemented 0.18 µm standard CMOS process, the post-layout simulation results show that proposed design achieves minimum (TC) of 2.1 ppm/°C over range −40 °C to 100 with 1.2 V supply voltage. also shows worst line regulation 0.034%/V at room temperature, when varies from 1.8 V. Due elimination...

This paper proposes a novel bandgap voltage reference with an accurate curvature compensation technique for completely compensating the thermal nonlinearity of emitter-base voltage. With VIS 0.15 standard CMOS process, proposed circuit achieves temperature coefficient 1.03 ppm/°C over range from -55°C to 155°C supply 1.8V. In addition, line regulation performance 0.02%/V 1.8V 3V and power rejection (PSR) levels are 83dB, 77dB, 58dB at ultra-low frequency (<;200Hz), 1kHz 10kHz, respectively.

This paper proposes two pico-ampere voltage references (VRs) for Internet-of-Things (IoT). The first VR is composed of subthreshold PMOS transistors. It achieves a minimum temperature coefficient (TC) 29 ppm/°C, current consumption 50.5 pA, line regulation 7,206 ppm/V, and power supply rejection ratio (PSRR) -28 dB at 100 Hz. In order to satisfy the better PSRR requirement high-end IoT systems, five-PMOS proposed realize ultra-high performance in PSRR. By employing technique, impacts...

The optical response of a metamaterial can be engineered by manipulating the size, pattern, and composition its cells. Here, we present coloring device, which increases resolution while retaining adjustability. By adding different nanoparticles in nanohole, shift transmission peak visible regions is realizable manageable, means series colors are revealed this device. At same time, it also possible to fill holes with dielectric materials refractive indices achieve purpose color diversity....