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A microwave gradient meta-surface is designed and fabricated. The structure is consist of a stack of two-dimensional (x-axis and y-axis) arrays of gradually-varied sub-wavelength elliptical rings, a dielectric substrate and a metallic ground plane. Both theoretical and experimental studies are conducted to demonstrate that the carefully designed y-axis phase gradient meta-surface supports high-efficiency...
This paper is concerned with the computation of electromagnetic scattering for multiple cavities which are filled with homogenous material and embedded in the infinite ground plane. Firstly, we focus on a single cavity model. The high order method of moments combined with equivalence principle is proposed to obtain the scattering properties of the cavity. The cavity dynamic Green's function is utilized...
Inverse Compton Scattering provides a unique way to produce quasi-monochromatic X-rays via the interaction of relativistic electrons with a laser pulse. This process has the advantage of producing a very high flux of X-rays with energies above a few tens of keV for a modest electron beam energy. In addition the output beam divergence is much larger than in classical synchrotron light sources and the...
In this paper, the design and particle simulation of a Ka-band stagger tuned gyro-twystron amplifier is presented. The concept of stagger tuning in gyro-twystron improves the bandwidth along with high RF output power which is suitable for radar application. The complete amplifier structure is modelled in “CST particle studio” for studying the beam wave interaction behaviour. The PIC simulation predicted...
Low-profile, high-gain circularly polarized antennas are highly desired in modern space and communication systems because they not only reduce the size, weight, and cost of the communication system but also reduce polarization mismatch resulting from the multipath interference of wave propagation. Because of their low cost, simple structure, and good integration capability, microstrip patch antennas...
The plasmonic metamaterial perfect absorber (MPA) is a recently developed branch of metamaterial which exhibits nearly unity absorption within certain frequency range [1–6]. The optically thin MPA possesses characteristic features of angular-independence, high Q-factor and strong field localization that have inspired a wide range of applications including electromagnetic wave absorption [3, 7, 8],...
We design and investigate a monolithically integrated wavelength converter based on a tunable V-cavity laser with a Mach-Zehnder interferometer with independent phase control. A 6.25 Gb/s non-return-to-zero conversion has been modeled using time-domain traveling-wave method.
The intention of this article is merely to describe the novel design of triple band filter based on multi-mode resonance characteristics of the capacitive loaded coupled cavity resonators. Edge groove cylindrical (EGC) coupled metallic posts are used as resonating elements. Two EGC resonators are embedded in a edge blended rectangular cavity of dimensions 98mm × 49mm × 140 mm. Both input and output...
Photonic crystal (PhC) nanobeam cavities have attracted increasing attention owing to the advantages of high Q-factor, small mode volume and no limitation of FSR. Various PhC cavities have been developed for optical communications, optical sensors, optomechanics, etc.. We investigate the design, fabrication, and experimental characterization of high quality factor PhCnanobeam cavities on silicon....
Triple-mode and quadruple-mode bandpass filters using triangular half-mode substrate integrated waveguide (HMSIW) are presented. To realize the two multi-mode filters, the triangular HMSIW cavity is perturbed by introducing via-hole arrays at different positions of the structure. The perturbation causes mode shifting of certain resonant modes near to the other resonant modes which are not affected...
We present a theoretical description of the electromagnetic coupling between a two-level system and the localized modes supported by the most paradigmatic plasmonic cavity: a pair of metallic spheres separated by a nanometric gap. Our method exploits the invariance of Maxwell's Equations under geometric transformations to obtain analytical expressions for the spectral density evaluated in the surroundings...
We present a 160 GHz pulsed source, based on an on-chip repetition rate multiplier scheme to double the repetition rate of an 80 GHz multiple pulse colliding mode-locked (mCPM) laser. For the first time to our knowledge, we demonstrate the monolithic integration of the mCPM laser and the pulse rate multiplier structures, using a generic foundry approach. From a 20 GHz fundamental repetition rate we...
Microwave assisted heating technology has become a popular alternative to conventional heating technologies with the characteristics of selectivity, instantaneity, integrity, safety, environmental friendliness and efficient energy-saving. Microwave absorption characteristics of material are critical because it provides an important index of utilization efficiency of microwave energy. However, a debate...
In the last number of years, optical cavities which are collectively known as whispering gallery resonators (WGR) have shown their versatility across a number of research fields from photonics applications, through fundamental studies in cavity optomechanics, to sensing. One type of WGR that has more recently been developed is the bottle-like microresonator (BLMR) [1] or microbubble [2], i.e., hollow...
In this study, the mode-matching method was applied to formulate an analytical model for a split cylindrical cavity resonator with a thick ceramic film layer sandwiched between two-layer alumina substrates. Next, resonant frequencies with the TE011 mode were computed with an eigenvalue problem approach using the model formula. The Q value of the resonator was also calculated by applying the perturbation...
This research concerns with a quantitative statistical characterization of IC and electronic systems in large complicated enclosures. The objective is to identify, quantify, predict and characterize the in-situ performance of IC electronics housed inside the enclosure of interest, such as a room, aircraft fuselage, or computer box. A novel hybrid deterministic and stochastic formulation is proposed,...
A high-power microwave undulator with tunable polarization is analyzed. The construction of the undulator cavity is designed. When TE11 microwave with a peak power of 800MW at 9.7 GHz fed into the cavity, the equivalent magnetic field of 0.3T are got. The equivalent period of the forward and backward microwave undulator are derived. The basic theory and dispersion relations of the FEL are studied...
The high power microwave (HPM) devices based on Cerenkov radiation have been investigated extensively for its high output power and high conversion efficiency. As a typical Cerenkov device, the relativistic travelling wave tube (RTWT) amplifier has shown promising gains of about 35 ∼ 45 dB under power levels of GW in the early stage. However, it was plagued by sideband generation and uncontrolled...
Recently, the concept of genuine N-partite Einstein-Podolsky-Rosen (EPR) steering has been developed [1], which is the natural multipartite extension of the original EPR paradox. Useful properties emerged from those special quantum states are not guaranteed for multipartite entangled states. And then a related concept of collective EPR steering in multipartite systems has been introduced, where the...
We present the device fabrication and experimental results of a dual wavelength slot coupled semiconductor laser for photonic millimeter-wave generation. The threshold current of the laser is about 35 mA. Dual-mode lasing with wavelength difference around 0.35nm was realized with SMSR better than 28 dB. By tuning the bias currents of the laser sections, the wavelength detuning of the doublet mode...
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