Abstract This article studies whether heart sound signals can be used for emotion recognition. First, we built a small database, and simultaneously recorded the participants’ ECG comparative analysis. Second, according to characteristics of signals, two evaluation indicators were proposed: HRV sounds (difference between successive heartbeats) DSV (the ratio diastolic systolic duration variability). Then, extracted linear nonlinear features from recognize four kinds emotions. Moreover,...

Dry-etching is often utilized to shape GaN-based materials. However, it inevitably causes plenty of sidewall defects as non-radiative recombination centers and charge traps that deteriorate device performance. In this study, the effects dielectric films deposited by plasma-enhanced atomic layer deposition (PEALD) chemical vapor (PECVD) on microdisk laser performance were both investigated. The results demonstrated PEALD-SiO2 passivation largely reduced trap-state density increased lifetime,...

We demonstrate here guided mode resonance (GMR) concentric circular grating filters (CCGFs) on an HfO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -on-silicon platform. The fabricated devices are realized with a membrane structure by completely removing the silicon substrate beneath device layer and, thus, can operate across entire visible wavelength band. Polarization-insensitive properties under normal incidence experimentally...

In this paper, systematical study on the focal shift phenomenon in planar lenses based GaN high contrast gratings was performed using finite element method (FEM). Influence of parameters including device size, designed length, total phase difference focusing performance is presented. It shows that mainly determined by Fresnel number lens, which nearly equal to divided π. The influence lens size and length can be attributed change number. Theoretical analysis diffraction theory employed...

A freestanding GaN grating coupler is proposed for planar photonic applications within the visible-wavelength spectrum. This device was produced by double-sided fabrication, combining front patterning with Si substrate back releasing and slab thinning. Transverse-electric (TE) transverse-magnetic (TM) light-wave conversion into out of membrane through coupling determined optical measurement. The maximum efficiency up to 69% TE waves 66% TM at each particular wavelength according finite...

We design and theoretically investigate freestanding gallium nitride (GaN) high contrast grating (HCG) membranes as broadband reflectors operating at the visible wavelengths. Optimization of structural parameters is accomplished by using particle swarm optimization (PSO), rigorous coupled-wave analysis (RCWA) method adopted to evaluate optical spectrum internal electric field intensity distribution all structures. The proposed reflector exhibits a 99% reflectance bandwidth 84 nm, good...

Abstract A carbon-nanotube (CNT) electrophoretic deposition (EPD) process has been developed to prepare a field emission layer in plasma display panels (PDP) for discharge voltage reduction. The CNT as source of priming electrons fabricated on the PDP front panel. balling grinding, mix-acid treatment and EPD parameters have investigated order obtain good uniformity excellent capability layer, meet specifications CNTs cell. measured turn-on was around 1.1 V/μm testing while minimum sustaining...

We design and implement one type of guided mode resonance (GMR) circular grating filters (CGFs) on an HfO2-on-silicon platform. Taking advantage angle-resolved micro-reflection measurement system, we achieve their incident angle- polarization-dependent reflection spectra. For normal arbitrary linear polarization, a pair peaks is experimentally observed due to the coexistence azimuthal component Ea radial Er wave electric field (E-field). oblique s-polarization (E-field perpendicular plane),...

Considering the compensation of thermo-optic coefficients (TOC) between GaN-based cavity and TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> photonic crystal (PhC) layer, we have theoretically designed a surface emitting laser (PCSEL) with temperature-insensitive wavelength. The structure includes freestanding GaN membrane embedded multiple InGaN/GaN quantum well (QW) layer top PhC layer. high refractive index (RI) cooperate to...

A GaN-based blue photonic crystal surface emitting laser (PCSEL) featured with membrane configuration was proposed and theoretically investigated. The dimension, (PhC) material, lattice constant thickness were studied by RCWA (Rigorous Coupled Wave Analysis), FDTD (Finite Difference Time Domain) simulations the confinement factor gain threshold as indicators. PCSEL's of active media is 13~14% which attributed to multi-pairs quantum wells efficient mode in cavity air claddings. excellent...

We design a type of metasurfaces capable serving as visible-light focusing reflector based on gallium nitride (GaN) high contrast gratings (HCGs). The wavefront the reflected light is precisely manipulated by spatial variation grating periods along subwavelength ridge array to achieve focusing. Different from conventional negative focal shift effect, positive observed in such reflectors. Detailed investigations influence device size performance, especially length, are preformed via finite...

We designed GaN-based blue photonic crystal surface emitting lasers (PCSELs) by incorporating a TiO2 (PhC) layer on top of the GaN surface. An AlGaN cladding was under active region to form waveguide-like cap layer. The dimension layer, lattice constant PhC, hole radius, and thickness were investigated optimize structure design in view PhC confinement factor gain threshold. With depth 100 nm layers, radius 40 nm, layers above below multiple quantum wells (MQWs), greater than 10% threshold...

Based on non-silicon surface micromachining, a single sensitive direction (z-axis) inertial microswitch with electrophoretic polymer–metal composite fixed electrode has been designed and characterised in the present work. The mainly consists of two parts: suspended proof mass as movable maple leaf-like top vertical electrode. When an acceleration (threshold level or over) is applied to switch along its direction, will rapidly move towards touch electrode, switching external circuit. can...

The carbon nanotube (CNT) auxiliary layers are suggested to reduce the high driving voltage in ac plasma display panel (AC-PDP). CNT layer, which was integrated on dielectric layer overlapping PDP bus electrode, formed by electrophoretic deposition without sheltering further emission light. effective pretreatment, uniform and thickness distribution of CNTs result excellent field-emission properties low turn-on field (1.7 V/μm), proved effectively discharge cell with A-type (CNT is at middle...

Micro-nano grooves incorporated into a suspended GaN sheet is proposed for active and passive monolithic integration of silicon based InGaN/GaN blue LEDs. Rigorous finite element method (FEM) simulation performed to investigate the efficiency coupling enhancement regulation effect. The imported from source waveguide significantly improved, especially small angle incidences membrane thickness, due grating overall increased by 240% in ±30° incident range, 140% ±70° with 300 nm thickness 260...

A kind of plasma display panel with a carbon nanotube (CNT) field-emission layer on the dielectric front was proposed and prototype prepared CNT fabricated by an electrophoretic deposition technique. The designed at middle ITO electrode 2D fluid simulation, bus same width aligned which can avoid obscuring emanating visible light from phosphor. effective pretreatment, uniform thickness distribution CNTs in resulted excellent properties layer. minimum sustaining voltages were decreased 30–40 V...

A photonic crystal nanobeam cavity (M-PCNC) with a structure incorporating mixture of diamond-shaped and circular air holes is proposed. The performance the simulated studied theoretically. Using finite-difference time-domain method, parameters M-PCNC, including thickness width, lattice constant, radii numbers holes, are optimized, quality factor Q mode volume Vm as indicators. Mutual modulation constant hole radius enable proposed M-PCNC to realize outstanding performance. optimized...

Abstract In this article, 3,3′,4,4′‐tetramethyldiphenylethane was obtained in 86.5% total yield by self coupling reaction of 3,4‐dimethylbenzyl chloride catalyzed Cu/Cu 2 Cl /PEG‐600 and promoted iron aqueous media the starting material prepared chloromethylation o‐xylene CTAB micellar catalytic system. Compared to other synthetic methods, improved method not only enhanced yield, but also made operating units easy workup. The mechanisms were proposed. structures products confirmed Elemental...