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Unlike general purpose computer architectures that are comprised of complex processor cores and sequential computation, the brain is innately parallel and contains highly complex connections between computational units (neurons). Key to the architecture of the brain is a functionality enabled by the combined effect of spiking communication and sparse connectivity with unique variable efficacies and...
We demonstrate multispectral metasurfaces over wafer-scale areas exhibiting greater than 85 percent absorption, ∼100 nm linewidths from 580–1125 nm by patterning plasmonic resonators in micron-scale pixels using a fusion of bottom-up and top-down fabrication techniques.
There has been significant advancement in photonic infrared (IR) detector technology in the past decade. In this tutorial, I will cover the basics of photonic IR detectors including the detection mechanisms and figures of merit. I will end with a survey of a few current technologies. Infrared imaging (3–25μm) has been an important technological tool for the past 60 years since the first report of...
Coastal communities constitute ∼40% of the total U.S. population, and roughly 50% of the national GDP is attributed to socio-economic activities in these regions. Port system operations and related industries constitute a majority of the industrial activities occurring in the region. This paper presents preliminary results from our work on the development of “FREIDA in Ports”: an interactive information...
For certain manipulation tasks, object pose estimation from head-mounted cameras may not be sufficiently accurate. This is at least in part due to our inability to perfectly calibrate the coordinate frames of today's high degree of freedom robot arms that link the head to the end-effectors. We present a novel framework combining pre-touch sensing and deep learning to more accurately estimate pose...
A novel Metamaterial Dipole Model (MDM) has been proposed as a powerful tool for modeling and designing metasurface antennas for numerous applications such as beamforming arrays, holograms, and flat lenses among others. In this technique, a metasurface antenna is described as a collection of effective magnetic dipoles characterized by their polarizability. The utility of this modeling technique relies...
When it's between a robot on your team and a human member of a competing team, who will you favor? Past research indicates that people favor and behave more morally toward ingroup than outgroup members. Conversely, people typically indicate that they have more moral responsibilities toward humans than nonhumans. This study puts participants into two competing teams, each consisting of two humans and...
We demonstrate the design of a frequency-diverse aperture for imaging of human size objects. Frequency-diversity is an all-electronic technique, allowing the imaging to be performed without any mechanical moving parts or active circuit components. Leveraging computational imaging algorithms, the concept of frequency-diverse imaging offers a simplified alternative to conventional techniques limited...
The paper describes a method of modelling lossy transmission lines with frequency dependent parameters in the fractional-order domain. It is shown that in high frequency systems the frequency dependence of the transmission line (TL) and other related losses are essential to be considered in the model. In this paper fractional-order domain is used to model the lossy transmission line, which compensates...
In this paper, we propose a software correction technique to eliminate the misalignment errors in the measurement of antenna radiated fields for frequency-diverse imaging. It is shown that by using RF fiducials integrated into the antennas, the effect of rotation (range and cross-range) and offset misalignment errors can be corrected to a good accuracy, holding significant potential for applications...
A novel computational technique is presented in this article for enabling the estimation of both the localization of radiating sources and their polarization states. To this end, a radiating metasurface is conceived to multiplex the polarization information received by the its aperture into a single frequency domain signal, allowing for a massive simplification of the architectures conventionally...
We investigate theoretically devices based on arrays of parallel planar waveguides inscribed with tilted Bragg gratings. We demonstrate polarization-dependent N by N+1 linear couplers. Deterministic switching can be achieved by coherent control of input beams with optimized apodization of the gratings.
Resting-state fMRI (rs-fMRI) measures the temporal synchrony between different brain regions while the subject is at rest. We present an investigation using visual information propagation transfer functions as potential optic neuritis (ON) markers for the pathways between the lateral geniculate nuclei, the primary visual cortex, the lateral occipital cortex and the superior parietal cortex. We investigate...
The production of sports highlight packages summarizing a game’s most exciting moments is an essential task for broadcast media. Yet, it requires labor-intensive video editing. We propose a novel approach for auto-curating sports highlights, and use it to create a real-world system for the editorial aid of golf highlight reels. Our method fuses information from the players’ reactions (action recognition...
In this paper, Discrete Dipole Approximation (DDA) is presented as a simulation tool for predicting the electromagnetic properties of one dimensional metasurface antennas and slotted waveguide antennas. The proposed method is verified by demonstrating excellent agreement between DDA predictions and that of a full-wave electromagnetic solver. This technique is especially attractive since it allows...
Direct UV written planar waveguides in silica have been explored for over two decades [1]. The technique is capable of fabricating low-loss channel waveguides, couplers and Bragg gratings by translating an appropriate substrate through a focused UV beam. To date direct UV written waveguides have been primarily formed by using 244nm laser light, relying on the photosensitivity provided by germanium...
Integrated optical systems offer high component density in a compact, stable and robust platform. However, there are many situations in which it is useful to transition from an integrated waveguide to an optical fiber, such as long distance transmission. The loss associated with coupling between the two platforms can be critical in applications such as quantum information processing (QIP).
The reliable generation of high-quality single photons has long been a goal of research in photonic quantum information. Direct-UV-written (DUW) silica-on-silicon waveguides provide a reproducible, uniform, low-loss, and fiber-compatible platform for the integration of spontaneous four-wave mixing-based heralded single-photon sources [1]. To overcome limitations caused by Rayleigh scattering, which...
There is increasing demand for low noise, narrow linewidth lasers for applications including spectroscopy, ion traps for optical clocks and gravitational waves measurements. External cavity diode lasers (ECDL) can provide a compact, low cost solution; however these are typically available at a limited range of optical frequencies. The increase in applications requiring robust laser systems (e.g. space...
Integrated Optical Fibre (IOF) is a passive optical platform that directly integrates optical fibre to a planar substrate, illustrated in Fig 1(a). It possess advantages associated with optical fibre such a low propagation loss, whilst enabling planar functionality commonplace with integrated optics. Planarization is uniquely achieved through a modified Flame Hydrolysis Deposition (FHD) technique...
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