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Two different types of innovative all-silicon integrated THz harmonic source and receiver components potentially enabling new THz active imaging modalities are introduced. The first consists of a multiplier-chain based power source and a harmonic heterodyne 2×2 receiver array; both operating simultaneously at multiple harmonics in the 160–1000 GHz band and therefore enabling the multi-color imaging...
This paper proposes a novel FPGA-based accelerator for the memory and compute-intense re-gridding process used in computation of Non-uniform Fast Fourier Transform (NuFFT). The re-gridding process interpolates arbitrary sampled data onto a uniform grid using an interpolation kernel function. This regridding step is considered one of the most time consuming step in entire NuFFT computation. We propose...
An 8-wavelength light source for silicon WDM transceiver was developed using an AlGaInAs DFB laser array integrated with tapered-SOA and precise flip-chip bonding technology. The device demonstrated high Si-waveguide-coupled output powers of >+2.3dBm/ch under 8-ch simultaneous operation at 70°C.
An extraordinary transmission effect for terahertz (THz) waves in a complementary metallic disk and hole array was experimentally and numerically demonstrated. Moreover, this result was also theoretically confirmed that the enhanced transmission peak in this structure was contributed both by the SPPs excited on the metallic structures and also the resonance in the dielectric rod between the metallic...
A dielectric hole lattice is proposed for creating diffractive optics in the terahertz range. An array of sub-wavelength air-holes in a dielectric material gives rise to an artificial dielectric, with refractive index depending on hole radius. The design uses low-loss dielectric materials, and exploits a half-wavelength etalon effect to minimise reflection, leading to near-perfect transmission. A...
The brain is a massively interconnected network of specialized circuits. Even primary sensory areas, once thought to support relatively simple, feed-forward processing, are now known to be parts of complex feedback circuits. All brain functions depend on millisecond timescale interactions across these brain networks. Current approaches cannot measure or manipulate such large-scale interactions. Here...
A novel TSV structure, formed by two semi-cylinders combining with a quadrangular is proposed and analyzed in this paper. This novel structure can enhance the density of TSV array without significantly decreasing transmission performance and reducing impedance mismatch in TSV-RDL transmission line or depressing the signal crosstalk. Effects of design parameters, such as the side length of quadrangular...
A semi-analytic approach for the electromagnetic analysis of large numbers of Through silicon vias (TSV) is presented in this paper. The method is based on cylindrical mode expansion method. The scattering and multi reflection effects between the vertical cylindrical vias are considered by expanding the electromagnetic waves surrounding the vias by cylindrical waves. As the method fully captured the...
The beam forming at millimeter-wave for commercial standards like IEEE 802.11ad, is drawing much attention recently. Despite its advantages of high gain, beam-steering capability, and wide spatial coverage, phased-array requires power-hungry and costly multiple channels, especially in large-scale array systems. Thus, it becomes crucial to develop low power and compact circuits for the systems to be...
We demonstrate a 1×4 optical phased array based switch in silicon-on-insulator using 12 interdigitated carrier-depletion based silicon modulators. The device footprint is 3.39 × 0.57 mm2 using 3.2mm long phase modulators. The measured insertion loss is −6.0 dB and the crosstalk is better than −13 dB.
We have proposed to place an RF circuit and an antenna on each side of a silicon chip in the 60 GHz band, respectively, and to connect between them with low loss by a coaxial-line structure using a hole opening in the chip. In this paper, we fabricate a 2×2 circularly polarized patch array in an area of 5 mm square on a silicon chip and have coaxial-line connection with a separated quadrature oscillator...
The cortical surface is composed of a mosaic of distinct regions that are functionally or micro-anatomically homogeneous. Parcellating the cortical surface into few lobes is a common approach in neuroimaging resulting from a long tradition in physiology. However, defining such sub regions consistent across subjects is more difficult. If macro-anatomical landmarks such as central sulcus and parieto-occipital...
This paper portrays the selection of hardware unit architectures to be implemented in the new LNS based on a 32bit system. The implementations of the LNS multiply and divide only require a FXP adder, while the LNS addition and subtraction function comprised of several memories, FXP adders and multipliers together with other supporting logics. Thus, in choosing the best FXP adders and multipliers,...
A 40-GHz coplanar waveguide (CPW)-fed post-supported patch antenna is presented using a modified fabricating method. The radiating patch is based on a quartz glass (SiO2) and the CPW feed line is based on silicon (Si) substrate. The post is constructed by SU8 photoresist with the thickness of 250 µm. Flip-chip method is used for the connection of the two parts. Compared to traditional designs, most...
We report the field-induced surface deformation of Si nano-apex and the achieving of highly reliable gated Si nanoemitters. It was found that the crystalline Si nano-apex deformed to amorphous structure at a low macroscopic field (∼0.6 V/nm) with an extremely low emission current (∼1 pA). First-principle calculations showed that the arsenic donor would increase the electric polarization on the Si...
This paper reports on the design of a compact wire ring on-chip antenna system for a spatial power combining single-chip transmitter at 820 GHz implemented in 0.25µm SiGe HBT technology. The array with a 2×2 arrangement illuminating a hyper-hemispherical silicon lens through the chip backside is driven by 4 parallel on-chip multiplier chains and is capable of delivering a single Gaussian-like beam...
W demonstrate a technique for improving the conversion efficiency in conventional silicon (Si) solar cells by using surface plasmon resonance (SPR) effects to harvest incident light energy over metal finger electrodes. Although the light absorption region beneath the metal finger electrodes cannot generate photocurrent, in this study, we employ the extraordinary transmission phenomenon, due to SPR...
In this paper a new silicon-based antenna structure with an embedded back cavity is presented. The basic antenna with an optimized geometry has good impedance matching with return loss of −40 dB and gain of 7.6 dBi at the resonant frequency of 60 GHz. The linear arrays of four antennas with the corporate feed network have been built with three different forms of rectangular back cavity to compare...
In this article, a novel frequency beam-scanning phased array antenna operating at Y-band is presented. The proposed antenna is a travelling-wave antenna, with cavity-backed patch arrays as the radiating elements. The array generates a very narrow beam (less than 2.5°) at the broadside of the antenna with ±25° steering capability. A prototype of the antenna is fabricated using silicon micromachining...
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