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Localized surface plasmon type resonances have been demonstrated in nanostructured films of recently discovered 2D Ti3C2. A planar design of highly broadband plasmonic absorber is implemented as an application of this new plasmonic material.
A fast, low-sample-volume mid-infrared carbon isotope ratio analyzer was developed and characterized. It's employed to demonstrate real-time monitoring the CO2 concentration and carbon isotope fractionation in plant photosynthesis and respiration processes.
We demonstrate evanescently-coupled waveguide modified uni-traveling-carrier (MUTC) photodiodes with more than 105 GHz bandwidth. The photodiodes have dark currents as low as nA and deliver RF output powers of 5.1 dBm, 4.4 dBm and 3.5 dBm at 75 GHz, 80 GHz and 90GHz, respectively.
We analyze the performance of anti-metal tags when they work in EMC (Electro Magnetic Compatibility) chamber and in substation. It is meaningful to the promotion of RFID(Radio Frequency Identification) tags applied in substation.
The Over-The-Horizon (OTH) locating of radiation source can be realized by the troposcatter propagation of electromagnetic (EM) signals. This paper studies the troposcatter signal group delay for target ranging and proposes a modified beamspace MUSIC to estimate the arrival azimuth angle of the troposcatter signal. Finally, the OTH target can be located by the ranging and azimuth angle estimation...
Chiral metamirrors can reflect one circularly polarized light without changing its handedness, while almost completely absorb the other, which would have many potential applications in engineering. In this paper, recent progresses of our group on the chiral metamirrors are reviewed. Firstly, we discuss the general method to design the chiral metamirrors under the framework of Jones calculus. The structural...
The tropospheric scatter mechanism is potentially valuable for over-the-horizon (OTH) passive sensing, two limitations of this mechanism as large propagation losses and scattering fading diffusion are analyzed. Based on the diffusion properties, the received signals are analyzed with a bilinear Cohen's class distribution, of which the parameterization function (i.e. the kernel) is built from the diffusion...
The paper presents the results of studies of monoatomic layers of graphene obtained using the CVD method on a copper foil, followed by transfer to a sapphire substrate. The basic electrophysical parameters of graphene samples were measured. Their irradiation with neutrons in the nuclear research IBR-2 reactor was carried out up to the fluences of 4.5·1019 n·m−2. A comparison of the Raman spectra before...
A method is proposed for locking the resonance of a high-bandwidth, silicon micro-ring modulator using intrinsic-defect-mediated-photon-absorption. The photo-signal is generated by the modulator, and thus the need for a waveguide tap is negated. A digital PID loop is used for stabilization.
Post-fabrication trimming of a silicon micro-ring resonator is demonstrated using an electrically mediated process. The resonance of a fully fabricated ring is permanently blue-shifted by 240pm after diffusion from local reservoirs of boron dopant. Thermal energy is supplied by an integrated heater.
A novel RFID reader antenna with polarization reconfigurable performance is proposed. The radiating part of the reader is a printed square ring, and a reconfigurable feeding network with an embedded PIN diode is introduced to reconfigure polarization. The proposed reader antenna can be linear and circular polarized at the 910–930 MHz band by switching ON/OFF the diode. The reader antenna was fabricated...
The optical lattice clock develops fast in recent years, and its stability and accuracy has already surpassed the microwave fountain clock and the optical clock based on ion trap. The mercury (Hg) lattice clock has the possibility to make a breakthrough in the limitation of blackbody radiation shift for strontium (Sr) and ytterbium (Yb) lattice clock, and reach the uncertainty in E-18 level at room...
Aqua MODIS Moon images obtained with bands 20 to 26 (3.66–4.55 and 1.36–1.39 μm) during scheduled lunar events show evidence of electronic crosstalk contamination of the response of detector 1. In this work, we determined the sending bands for each receiving band. We found that the contaminating signal originates, in all cases, from the detector 10 of the corresponding sending band and that the signals...
In this study we examined the linear decomposition and relationship between the SMAP observed Polarization Ratio into surface soil moisture and vegetation. Temporal linear regression, per each SMAP pixel, is performed to estimate the decomposition coefficients. Variances (explained variance) in PR is predominantly dominated by dynamics of surface soil moisture and degrades with increasing vegetation...
Since launch on May 04, 2002, Aqua MODIS has successfully operated for 15 years and continuously produced from its observations many data products in support of a broad range of scientific research activities and applications. Its overall mission success has relied heavily on the dedicated efforts to operate and calibrate the instrument and to track and correct on-orbit changes in sensor responses...
Wireless Video Sensor Networks (WVSNs) have been widely proposed for monitoring spatial environments. Dissimilar from traditional Wireless Sensor Networks (WSNs) where nodes such as thermal and light sensors are o.en considered in 2D and with omnidirectional sensing ranges, the sensing range of a video sensor in WVSNs is deemed as directional and usually cognized as a rectangular pyramid shape in...
The peculiar coupling of the spin and the valley degrees of freedom in Transition-Metal Dichalcogenides (TMDs) makes this class of materials very interesting for quantum information and possible valleytronics based devices [1]. In the last year the valley depolarization dynamics in TMDs has been object of an intense study [2, 3, 4, 5].
Lab-on-a-chip (LoC) devices are extremely promising to bring diagnostic functions at the point-of-care. The LoC paradigm can be resumed in the will to emulate all the functionalities of a modern analysis lab onboard a portable platform, or at least a compact system, realizable at contained costs. At this scope, an important goal is the design of imaging schemes able to work out of the lab.
For the first time, a surface acoustic wave (SAW) resonator based on the AlN/6H-SiC multilayer structure is designed and fabricated. Firstly, we have succeeded in solving the problem of obtaining AlN (002) on 6H-SiC substrate. The results show that highly c-axis-oriented AlN thin films are obtained, with that the diffraction peak of AlN is 36.121° and the lowest full width at half maximum (FWHM) value...
We present an investigation of shot noise in graphene-based Hall sensors, with the purpose of evaluating their detection limit and of developing strategies to improve their characteristics. We perform measurements on two devices, one with a defective contact that could however be used as a gate to control the carrier density in the device and the other with all contacts working. We discuss the results...
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