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Microring resonators are basic building blocks for a variety of functions such as modulators, switches, buffers, and filters. Active tuning of resonators and external coupling are widely used to change the resonance properties. In this lecture, we will present the basic elementary switch devices and the NxN switching fabric made of various types of silicon active microring resonators. An elementary...
Using atomically flat gold surfaces, we observe long- and short-range surfaces plasmons on unstructured as well as patterned surfaces. Time-resolved two-photon photoemission microscopy reveals the rich dynamics of plasmon propagation, including spin-orbit coupling in surface plasmons with orbital angular momentum up to l = 20.
A novel single-polarization microring resonator is proposed and demonstrated to enable the wavelength-selectivity for only one polarization (e.g., TM polarization), which is useful for a polarization-/wavelength-division hybrid multiplexing system.
In this paper, high frequency measurement of TSV structures under different DC bias conditions are carried out. The impact of the MOS capacitance effect of TSV on its transmission performance is analyzed. Capacitance and conductance parameters of TSV are extracted and compared with numerical calculations.
Three-dimensional integration technology is deemed as the most promising alternative in post Moore's Law era. The electrical performance of through silicon vias (TSVs), which are the key enabler for 3D integration, is crucial to modeling and design of 3D systems, especially for high-speed systems. This paper gives a partial review on recent progress in the field with the focus on the high-frequency...
Grating couplers realized on a Silicon-on-Insulator (SOI) platform are an efficient means of coupling light from a single-mode optical fiber into silicon photonic waveguides. Grating couplers can be 1D, coupling light with a fixed polarization into a single waveguide, or 2D, in order to couple light with unknown polarization into a pair of silicon waveguides. In this work we review computational approaches,...
We demonstrate a coupler with an ultra-broadband high coupling efficiency of 96% at 1550 nm, and > 90% from 1450 nm to 1650 nm experimentally. The coupler also features ease of cleaving and large alignment tolerances of 3.8 μm horizontally and 3.6 μm vertically.
Phoxonic crystals are periodic nanostructures that are simultaneously photonic and phononic crystals. Phoxonic cavities can trap visible or near infrared light and Gigahertz phonons in the same tiny volume, while phoxonic waveguides can confine their propagation to a tiny solid core, in both cases possibly promoting their interaction. This paper reviews various phoxonic nanostructures that have been...
This work presents the initial characterization of planar silicon pin-joints for use in linkages for walking microrobot legs. A major goal in walking microrobotics is the creation of robust leg structures driven by low-power motors capable of lifting a 20mg mass and propelling it forward. Hinged joint structures, rather than stiff flexures, are ideal for this task. However, since joints are not fully...
We propose a three-dimensional polarization splitter and rotator with high fabrication tolerance and CMOS BEOL compatibility, achieving a high TE-TE transmission and TM-TE conversion efficiency of −0.21dB and −0.63dB at 1310nm, respectively.
In this paper, we present a high speed electro-optic directional coupler switch based on horizontal Si-polymer-metal hybrid plasmonic waveguide. Simulation results show that the speed of higher than 1 THz could be reachable. The overall length and insertion loss of optical switch are ∼ 24 μm and 1.5 dB, respectively, with the drive voltage of ±2 V.
Social networks become very popular in recent years seen from the popularity of online social networks. Relationship on social network consists of connection between users that can be modeled by a graph with nodes and edges. This relation graph can form a community that is a group of nodes within which connection is dense, but between them the connection is sparse. According to this property of communities,...
Silicon detectors have been used in astrophysics satellites and particle detectors for high energy physics (HEP) experiments. For HEP applications, EMC studies have been conducted in silicon detectors to characterize the impact of external noise on the system. They have shown that problems associated with the new generation of silicon detectors are related with interferences generated by the power...
Optical frequency division based on mode-locked laser frequency combs makes possible the coherent transfer of frequency stability from optical systems to electronics. It has enabled a revolution in time keeping and frequency metrology. In this paper we describe progress on new methods for frequency comb generation including whispering-gallery-based microcombs and electro-optical comb generation. Demonstration...
In this paper, a novel decentralized fault diagnosis and fault tolerant control scheme is proposed for a class of interconnected nonlinear systems where each mode does not need to exchange information with other ones. The couplings' effect among subsystems is analyzed from the global system point of view and is eliminated by using the cyclic small-gain technique. A simulation example of three inverted...
A silicon micro-ring device with tunable four-wave mixing efficiency is presented. The micro-ring is monolithically integrated with a dual polarisation filter based on a cascaded three ring resonator geometry. Four-wave mixing is demonstrated with signal and idler transmitted through the filter with only 1.8 dB of insertion loss. The pump light is rejected with over 62 dB extinction for both TE and...
We report the first observation of mode splitting in a standalone microelectromechanical resonator resulting from the coupling from a mechanical mode to intrinsic localized modes. The demonstration of this coupling mechanism in a microstructure finds its relevance in both fundamental studies including explorations of phonodynamics and applications exploiting energy localization or delocalization by...
In this paper, we show that using the relation between the inductance matrix and the capacitance matrix in a homogeneous medium to extract the coupling capacitance in a through silicon via (TSV) array is inaccurate. This is because this relation assumes a lossless, homogeneous surrounding medium. We show that this model can cause an error up to 70% in coupling capacitance compared to Q3D extractor...
An approach for a low-power chip-scale package is described, that provides a laser output with a programmable frequency across 50 nm of bandwidth centered at 1550 nm, and a resolution of one part in 1014.
This paper presents a 3D circuit model capable of rapidly and accurately evaluating substrate noise coupling in the context of 3D integration. Since TSVs are large and noisy structures, the evaluation of electromagnetic coupling to and from TSVs has become crucial to the design of threedimensional integrated circuits. In this work, we present a fast and accurate 3D circuit model to this end. The model...
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