Abstract In recent years, research focusing on synaptic device based phototransistors has provided a new method for associative learning and neuromorphic computing. A TiO 2 /AlGaN/GaN heterostructure-based phototransistor is fabricated measured, integrating nanolayer gate two-dimensional electron gas (2DEG) channel to mimic the weight cleft, respectively. The maximum drain source current 10 nA, while driven at reverse bias not exceeding −2.5 V. excitatory postsynaptic (EPSC) of 200 nA can be...

A novel graphene photodetector with embedded in a metamaterial perfect absorber (MPA) is proposed and its light absorption property numerically investigated. Absorption above 40% obtained, which over 17 times that of bare monolayer graphene. Both horizontally vertically cascaded MPAs integrated are also

Abstract Solar cells incorporated with multi-coloring capability not only offer an aesthetic solution to bridge the gap between solar modules and building decorations but also open up possibility for self-powered colorful display. In this paper, we proposed a multi-colored semi-transparent organic (TOSCs) design containing metallic nanostructures both high color purity efficiency based on theoretical considerations. By employing guided mode resonance effect, TOSC behave like efficient filter...

Aiming at the requirement of passive terahertz imaging, we report a high-sensitivity detector based on an antenna-coupled AlGaN/GaN high-electron-mobility transistor (HEMT) 77 K without using low-noise amplifier. The measured optical noise-equivalent power and temperature difference were about 0.3pW/Hz 370 mK in 200 ms integration time over bandwidth 0.7 - 0.9 THz, respectively. By this detector, demonstrated imaging room-temperature objects with signal-to-noise ratio up to 13 dB. Further...

A novel polarization rotator (PR) based on mode coupling in plasmonic waveguides is demonstrated by simulation. silicon waveguide with asymmetric claddings of oxide and metal applied to induce a hybridization the modes. Operating at telecommunication wavelength 1.55 μm, conversion efficiency 99.7% can be achieved device length 9.7 μm an insertion loss 2.2 dB. This PR easily fabricated oblique deposition after etching without precise alignment for two-step lithography as required previous design.

Plasmonic scattering from metallic nanoparticles has been used for centuries to create the colorful appearance of stained glass. Besides their use as passive spectral filtering components, multifunctional optoelectronic applications can be achieved by integrating nanoscatters with semiconductors that generate electricity using complementary components plasmonic colors. To suppress usual degradation both efficiency and gamut coloration in highly asymmetric index configurations like a silicon...

Abstract In this paper, we discuss a potential multiple access and modulation scheme based on polarized states (PS) of electromagnetic (EM) waves for line-of-sight (LOS) communications. The proposed is theoretic different from the existing polar EDGE WCDMA systems. We propose detailed bit representation (modulation) using PS. Because inflexibility polarization information in time frequency domains, as well independence space, can be used independently wireless communications, i.e., another...

Transparent conducting oxides (TCOs) are emerging active materials for light modulating due to their special epsilon-near-zero effect. A novel spatial technique based on the guided mode resonance effect in a slot waveguide with TCOs is proposed, where both transmission and reflection can be manipulated by injecting or depleting carriers into TCO layer. Temporal coupled theory finite element method used analyze coupling filtering. modulation depth at 1550 nm as high 0.85 obtained dramatic...

In this article, we report an antenna-coupled AlGaN/GaN high-electron-mobility transistor integrated on a hyper-hemispheric silicon lens for heterodyne detection in 340 GHz band at room temperature. The responsivity, elevated shot noise, flicker and dynamic source-drain resistance homodyne are characterized analyzed different local terahertz (LO) power levels. With LO of only −3.9 dBm, the detector offers conversion loss less than 28 dB noise-equivalent (NEP) about −132 dBm/Hz. A threshold...

We report a sub-terahertz scattering-type scanning near-field microscope (sub-THz s-SNOM) which uses 6 mm long metallic tip driven by quartz tuning fork as the probe. Under continuous-wave illumination 94 GHz Gunn diode oscillator, terahertz images are obtained demodulating scattered wave at both fundamental and second harmonic of oscillation frequency together with atomic-force-microscope (AFM) image. The image gold grating period 2.3 µm modulation agrees well AFM experimental relationship...

We describe the integral electro-optical strategies that combine functionalities of photovoltaic (PV) electricity generation and color filtering as well polarizing to realize more efficient energy routing in display technology. Unlike conventional pigment-based filters polarizers, which absorb substantial amounts unwanted spectral components dissipate them form heat, we propose converting those photons into by constructing PV cell-integrated based on a selectively transmitting aluminum (Al)...

To satisfy the demand for broadband and high-sensitivity terahertz detectors, we designed verified a detector built with antenna-coupled AlGaN/GaN high-electron-mobility transistors (HEMTs). Eighteen pairs of dipole antennas different center frequency from 0.24 to 7.4 THz are arrayed into bow-tie pattern. The corresponding eighteen have common source drain but gated channels coupled by antennas. photocurrents generated each channel combined in as output port. With incoherent radiation hot...

Polarization filtering has attracted a great interests for it can be used to solve problems of signal separation and interference suppression those are difficult process in the time, frequency spatial domains. information both target needed design polarization filter conventional method, while exact estimation is some errors also render poor performance filtering. Based on superior merits oblique projection processing applications, novel blind adaptive (OPPF) algorithm proposed this paper....

We report an attempt to improve the sensitivity of terahertz detection based on self-mixing in antenna-coupled field-effect transistors by enhancing factor and antenna with a reduced gate length antenna-gate gap, respectively. An optical noise equivalent power (NEP) 3.7 pW/Hz at 0.65 THz was achieved GaN/AlGaN high-electron-mobility transistor (HEMT) 300 nm gap 200 room temperature. It found that inversely proportional responses upon coherent/incoherent irradiation were well described model....

Highly oriented beam steering will enhance power density and field of view (FOV) in terahertz wireless links. Metasurface can be constructed by deliberate arrangement subwavelength meta-cells to manipulate the wavefront. This paper explores a dispersive metasurface with specific phase gradient patterned 2-inch aperture, allowing for collimated beamforming two-dimensional (2D) combination frequency tuning rotation. The is directly fed horn antenna, ensuring compact integration. Simulation...

CMOS-compatible plasmonic modulators operating at the telecom wavelength are significant for a variety of on-chip applications. Relying on manipulation transverse magnetic (TM) mode excited metal-dielectric interface, most previous demonstrations designed to response only specific polarization state. In this case, it will lead high dependent loss, when polarization-sensitive modulator integrates fiber with random Herein, we propose utilizing metal-oxide indium tin oxide (ITO) wrapped around...

To improve the performance of radar High-Resolution Range Profile (HRRP) target recognition, a new attention-based model is proposed based on time domain feature. This architecture encodes feature which can reveal correlation inside with Recurrent Neural Network (RNN). Then, this gives weight to each part and sums hidden for final recognition. Experiments measured data show that effective HRRP Furthermore, method still find support areas even removed test data.

We report a room-temperature, low output impedance, broad intermediate-frequency (IF) bandwidth field-effect terahertz detector based on an AlGaN/GaN high-electron-mobility transistor (HEMT) integrated in metal waveguide. The waveguide equips pair of quasi-Yagi antenna probes that are used to couple the energy HEMT channel. gate is configured as asymmetric edge-coupled coplanar transmission line. This electric field asymmetrically distributed channel along edges lines. responsivity and noise...

The interferences coming from the radar members degrade detection and recognition performance of sensor networks (RSNs) if waveforms are nonorthogonal. In this paper, we analyze by exploring polarization information electromagnetic (EM) waves. Then, propose oblique projection filtering- (OPPF-) based scheme to suppress while keeping amplitude phase its own return in RSNs, even polarized states not orthogonal. We consider cooperative RSNs environment where each member is known all. proposed...

We report an approach to make two-terminal antenna-coupled AlGaN/GaN high-electron-mobility-transistor self-mixing terahertz detectors. Fluorine ion implantation is used increase the threshold voltage of two-dimensional electron gas. An optimal dose can be reached so that detector responsivity maximized at zero gate or with floating. The relationship between dosage and voltage, mobility, density, responsivity, noise-equivalent power (NEP) obtained. A minimum optical NEP 47 pW/Hz achieved...

Plasmonic waveguides essentially support only transverse magnetic modes. A novel plasmonic waveguide consisting of hybrid in both vertical and horizontal directions is proposed to reduce the polarization dependence. In a combined waveguide, surface plasmon polariton (SPP) modes polarized exist correspondingly oriented waveguide. an optimized structure, anticrossing mode coupling observed between these two SPP with low birefringence by finite-difference time-domain simulation. The energy flux...

Non-metallic plasmonic materials have recently attracted research interest due to their adjustable material properties and the potential low loss, which is important waveguides with ultrahigh mode confinement. In this paper, we analyzed of four types based on noble metals, aluminum-zinc-oxide (AZO), TiN, where propagation length size are chosen compare figures merit. It found that AZO has smallest imaginary part permittivity in near-infrared region, while lengths comparable those Cu but...