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This paper presents a new concept of PUF based on a chaotic behavior. Chaos is essentially not a random phenomenon but a deterministic non-periodic flow which can be utilized to extract reproducible unique ID entropy. The strong parametric sensitivity of the chaos guarantees ID variety and unclonability over unpredictable manufacturing variations. An undesirable disturbance due to dynamic parametric...
We have designed, fabricated and tested edge couplers for silicon photonics targeting industry-standard SMF-28 fibers. These edge couplers are based on a SiN inverse taper fabricated on a silicon-on-insulator (SOI) platform combined with an etch-based substrate removal process that prevents leakage of the expanded mode to the underlying silicon substrate. The measured couplers exhibited a 0.5 dB bandwidth...
The process where a laser and a Si waveguide were coupled was simulated by MATLAB. In order to obtain the coupling efficiency accurately and quickly, an improved finite-difference beam-propagation method(FD-BPM) and the simple transparent boundary condition(STBC) were selected. Several spot-size convertors (SSCs) of different structure with tapered Si waveguide, square SiON waveguide and SiO2 layer...
A silicon micromachined waveguide hybrid coupler for J-band (220–325 GHz) applications is presented. The coupling and phase shifting functions are realised using a 90° ridged waveguide phase shifter, a joint waveguide section and a port extension. The hybrid coupler is fabricated using a micromachined waveguide technology employing a double H-plane split that results in low losses. For the design...
We demonstrated the distributed optoelectronic properties enabled by graphene Bragg gratings (GBGs) to realize a hybrid single mode laser on silicon. A remarkable side-mode suppression ratio (SMSR) of 48 dB is achieved, benefitting from the complex coupling of the GBGs.
We present the design of an integrated dual-polarisation superconductor-insulator-superconductor (SIS) mixer operating at ALMA Band 10 frequency range. All the RF components, including the orthomode transducer (OMT), the quadrature hybrid and the SIS mixer circuits, are designed as superconducting planar circuits to form a single planar mixer chip. The mixer circuits will be fabricated using standard...
The chemical reaction network theory, which has been established by M. Feinberg and his collegues, gives an important theorem called the Deficiency Zero Theorem (DZT). This theorem provides methods for analyzing the stability of ODEs that describe the time-evolutions of molar concentrations of species in chemical reaction networks. In the present paper, we consider a class of non-weakly reversible...
This paper presents a novel robust method to excite a slot waveguide mode. We experimentally demonstrate the fundamental slot-mode excitation in a Si slot-waveguide ring resonator. Furthermore, we also demonstrate nearly athermal (12 pm/°C) behaviour of PMMA filled slotted ring resonator.
THz radiation can couple in various undesired ways to THz detectors, e.g. through wires or contact pads, aggravating calculation of sensible values for the device responsivity. We therefore investigate coupling of THz radiation to antenna-less large area field-effect transistors with dimensions in the range of the THz spot size proving that only a very small fraction of power is coupled through the...
This paper proposes implementing an antenna operating in the millimeter wave band of 56–64 GHz on the backside of an Integrated Circuit (IC) that uses Through Silicon Via (TSV) technology for a System in Package (SiP) approach to mixed signal design. A folded monopole antenna that utilizes a coaxial TSV feed line is selected to implement the design on the backside of the silicon die. Furthermore,...
A vertically curved Si surface optical coupler for high-numerical-aperture optical fibers with 5-μm-mode-field-diameter was fabricated. The dome-like SiO2 coupler-top could be successfully formed, and the fabricated coupler showed optical coupling with loss of 5.2 dB and the 0.5-dB bandwidth of 110 nm.
Reduction of the polarization dependent loss (PDL) of 1.3 μm two dimensional grating coupler (2D-GC) was demonstrated by using slanted arrays and cross shaped scatterers. The PDL of 2D-GC was measured to be < 0.5 dB over a 40 nm range at 1.3 μm.
Spectral variation behavior for many grating couplers is experimentally investigated. It was found that the coupling wavelength is shifted by fabrication deviations in grating structure, and grating depth variation in 300-mm wafer processes is precisely derived by numerical analysis for coupling wavelength variation.
We investigate the possibility of using silicon waveguides as Faraday rotators for optical isolators. We employ multimode waveguides with a square cross-section. This approach offers the opportunity to introduce integrated nonreciprocal components into the silicon-on-insulator platform without complication of an additional magneto-optical material.
We compare the performances of different spot size converter (SSC) designs consisting of backend waveguide arrays (“dot-like”, “cross-like”, “stripes”, “box”) at the facet, adiabatically coupled to tapered Si waveguides. For the study, we use SiON waveguides and a low index step “box” waveguide.
We present a unique lateral bulk resonance mode with a lateral strain profile that resembles a shirt button that we transduce piezoelectrically in a MEMS disk resonator. This button-like (BL) mode offers the 3-fold benefits of (1) intrinsic feedthrough cancellation using fully-differential transduction, (2) strong piezoelectric coupling from the associated strain profile, and (3) higher quality (Q)...
High performance PZT-on-silicon disk flexure resonators were recently demonstrated with peak |S21| of −1 dB with direct 50 Ω termination, high bandwidth tunability, and high coupling at 22 MHz. This paper explores the performance limits and design optimization of this new resonator in the space of radius and silicon thickness of the (1,1) disk flexure mode. This effort is enabled by the Rapid Analytical/FEA...
Previous studies have shown Periodically Poled Lithium Niobate structures on Z-cut LiNbO3 could be used as acoustic transducers to generate acoustic waves. Investigations on Periodically Poled LiNbO3 (YXl)/128° transducers have been conducted. Simulations have pointed out interesting electromechanical coupling from such transducers. Fabrication of Periodically Poled (YXl)/128° LiNbO3 transducers bonded/thinned...
Single-electron tunneling (SET) transistors have been studied for the past several decades because they are promising for low-power consumption and fundamental-level control of charge. The quantum dots (QDs) that are the main part of an SET transistor have been demonstrated in a variety of materials, but recently dopant-atoms in silicon have also been shown to work as QDs. However, a single conventional...
By simultaneously considering the enhancement of quantum confinement on the effective bandgap and minimum transition energy, the silicon (Si)/ silicon carbide (SiC) quantum dot superlattice (SiC-QDSL) with aluminum oxide (Al2O3-QDSL) passivation layer shows the high short-circuit current (Jsc) of 4.77 mA/cm2 in theoretical, which agrees with the Jsc of 4.75 mA/cm2 obtained in the experiment under...
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