We replace metals in plasmonic metamaterials by new plasmonic ceramics such as transition metal nitrides, whose properties resemble those of gold. Within the computational microwave imaging framework. Metamaterials and imaging nano convergence full text. Duke university duke university engineers have developed a novel. Metamaterial apertures for computational imaging john hunt, tom driscoll, alex mrozack, guy lipworth, matthew reynolds, david brady, david r. Holographic and spotlight metamaterial apertures for microwave and millimeter wave imaging and methods of use are disclosed. Dynamic metamaterial aperture for microwave imaging. Smart devices must see and recognize objects and gestures in their surroundings as quickly as possible. We consider a contactless sensor that illuminates its surroundings with microwave illumination shaped by a programmable metasurface. In section 3, the simulated psf of the metamaterial aperture is presented and compared to the resolution limits of a sar system of the same dimensions. This designer aperture allows image compression to be performed on the physical hardware layer rather than in the. Metamaterial apertures for coherent computational imaging on the physical layer.
Pdf cavitybacked metasurface antennas and their application to. Metamaterial apertures for computational imaging john hunt,1,4 tom driscoll,1,2,4 alex mrozack,3 guy lipworth,1,4 matthew reynolds,4 david brady,4 david r. Intelligent electromagnetic sensing with learnable data. Frequencydiverse bunching metamaterial antenna for. Metamaterial fibres for subdiffraction imaging and. Recently, a frequencydiverse, metamaterialbased aperture has been introduced in the context of microwave and millimeter wave imaging. Research article journal of the optical society of america b 1 singlefrequency microwave imaging with dynamic metasurface apertures timothy sleasman1,michael boyarsky1,mohammadreza f. In the conventional optical system, evanescent waves, which carry subdiffraction spatial information, has exponentially decaying amplitude and therefore cannot reach to the image plane. Frequencydiverse microwave imaging using planar millscross cavity apertures okan yurduseven, jonah n. Pdf we present a reconfigurable, dynamic beam steering holographic. The dynamic aperture consists of a microstrip transmission line with an array of radiating, complementary, subwavelength metamaterial irises patterned into the upper conductor. These properties are exploited in designing functional components and devices for many potential applications. Smith1 1 department of electrical and computer engineering, duke university, durham, nc 27708, usa.
We present a dynamic metamaterial aperture for use in computational imaging schemes at microwave frequencies. Novel metamaterial sensor provides bigger picture 17 january 20 this shows john hunt, left, and tom driscoll. Metamaterial apertures for computational imaging request pdf. Resolution of the frequency diverse metamaterial aperture. Lipworth g, mrozack a, hunt j, marks d l, driscoll t and brady d 20 metamaterial apertures for. We investigate the imaging capabilities of a onedimensional, dynamic, metamaterial aperture that operates at the lower part of kband microwave frequencies 17. Large aperture, wideband, and scanning systems are thus generally. The dynamic metamaterial provided a new method to design a metamaterial aperture antenna.
Frequencydiverse bunching metamaterial antenna for coincidence. A guidedwave metamaterial aperture is used to perform compressive image reconstruction at 10 frames per second of twodimensional range and angle sparse still and video scenes at kband 18 to 26 gigahertz frequencies, using frequency diversity to avoid mechanical scanning. In section 2, the metamaterial imager and the simulation model for the metamaterial aperture are brie. Optically transparent metamaterial absorber using inkjet.
A metamaterial aperture operating as a leaky waveguide with resonating metamaterial irises can sweep its operation frequency to modify its complex field pattern with no moving parts. The generic form of the aperture is that of a parallel plate waveguide, in which complementary metamaterial elements patterned into the upper plate couple energy from the waveguide mode to the scene. We propose a multifunctional device by using the solidstate plasma, which can be called a plasma metamaterial absorber pma. However, unlike gold, these materials have adjustabletunable. In 2016, fromenteze an colleagues presented a 3d computational imaging system based on a modemixing cavity metamaterial aperture at microwave.
Smith this imager that weve designed in this experiment uses no moving parts, no lenses, and uses only a single detector. G lipworth, a mrozack, j hunt, dl marks, t driscoll, d. In 2015, sleasman and colleagues presented a dynamic metamaterial aperture designed for microwave computational imaging schemes by leveraging a metamaterial element with two diodes connected to an. Smith 1 1department of electrical and computer engineering, duke university, durham, north carolina 27708, usa 2xlim research institute, university of limoges, 87060 limoges.
Metasurfaces, a more practical outgrowth of metamaterials research, are appealing for imaging applications for several reasons. Millimeter wave imaging using metamaterial transceivers. Computational imaging systems use postprocessing techniques to extract scene. In the past decade, metamaterials have attracted a lot of attention because of their abilities to exhibit unusual electromagnetic properties. These metasurfaces found applications in the generalized law of refraction 6, wavefront shaping virtual huygens sources 7, 8, 9, and computational imaging 10. In order to make the metamaterial absorber optically transparent, an inkjet printer was used to fabricate a thin conductive loop pattern.
The problem can be broken into b a simple conceptual form but is more effectively implemented with a c multiplexing aperture con. We experimentally demonstrate seethrough detection and 3d reconstruction using terahertz leakywave radar based on sparse signal processing. Each metamaterial element contains two diodes connected to an external control circuit such that the resonance of the metamaterial element can be. Metamaterials have earned their name with extraordinary properties such as negative refractive index and invisibility cloaking. Computational imaging is the process of indirectly forming images from measurements using algorithms that rely on a significant amount of computing.
Since computational imaging systems crucially rely on the accuracy of a forward model. Imani 1, timothy sleasman 1, michael boyarsky 1, laura pulidomancera 1, jonah n. Metamaterial apertures for coherent computational imaging. As a synthetic 2d plane, metamaterial antennas are composed of subwavelength resonant particles. Design of a multifunctional device based on the solid. For the latter i detail how we model the imaging capabilities of a recentlyintroduced class of dispersive metamaterial based leaky apertures that produce pseudorandom measurement modes, and demonstration of novel lorentzian. Image transmission through dynamic scattering media by. You probably recall the use of metamaterials in the constitution of flat lenses in plenoptic function sensing hacks. New optical materials called metamaterials have provided new ways to. Beam shaping for reconfigurable holographic antennas. By combining the processing algorithms with the dma hardware, we. Synthetic aperture radar with dynamic metasurface antennas. Lipworth g, mrozack a, hunt j, marks dl, driscoll t, brady d, smith dr.
Complex apertures require detailed characterization of radiated fields. Antennas that combine hollow cavities and metamaterial apertures achieve both. The common absorption frequency region of te and tm waves can span from 1. By randomly distributing the metamaterials resonance frequencies, we show. The absorber can get tunable absorption spectrum by exciting different solidstate plasma resonance units.
Beam synthesis with lowbit reflective coding metamaterial. By leveraging metamaterials and compressive imaging, a lowprofile aperture capable of microwave imaging without lenses, moving parts, or phase shifters is demonstrated. An optically transparent metamaterial absorber that can be obtained using inkjet printing technology is proposed. We explore the feasibility of achieving computational imaging using wifi signals. Resolution of the conventional lens is limited to half the wavelength of the light source by diffraction. Specifically, the mechanism to combine the electronic tuning of the dma and. Jiang y et al 2018 electron ptychography of 2d materials to deep subangstrom resolution nature 559 3439. In 2015, sleasman and colleagues presented a dynamic metamaterial aperture designed for microwave computational imaging schemes by leveraging a metamaterial element with two diodes connected to an external control circuit 19,20,21,22,23,24,25.
Metamaterial designs for applications in wireless power. Coding metamaterials are the new technology where the aperture coding provides the hardware foundation for the miniaturization of the devices. In 2015, sleasman and colleagues presented a dynamic metamaterial aperture designed for microwave computational imaging schemes by. Metamaterial apertures for computational imaging by john hunt, tom driscoll, alex mrozac, guy lipworth, matthew reynolds, david brady, david r. While the metamaterial fibre clearly resolves the single 200. The aperture consists of an array of complementary, resonant metamaterial elements patterned into the upper conductor of a microstrip line. Metamaterial layer 230 along with waveguide 240 of. Metamaterial apertures for computational imaging abstract. Recently, twodimensional metamaterial surfaces, generally named metasurfaces, were introduced to shape wavefronts beyond what was possible using frequency selective surfaces. Errors on multistatic microwave imaging based on frequencydiverse metamaterial apertures, progress in electromagnetics research b, 70 2016. Each metamaterial element contains two diodes connected to an external control circuit such that the resonance of the metamaterial.
Dynamic metasurface antennas for microwave computational. To achieve this, we leverage multipath propagation that results in wireless signals bouncing off of objects before arriving at the receiver. Review on microwave metamaterial structures for near. According to an aspect, an imaging system includes metamaterial elements being spaced apart and configured to respond to an electromagnetic field for radiating in a predetermined pattern to illuminate a scene. The application of terahertz waves to radar has received increasing attention in recent years for its potential to highresolution and seethrough detection. Metamaterial apertures for computational imaging science. To reliably predict the imaging performance of such an. J hunt, t driscoll, a mrozack, g lipworth, m reynolds, d brady, dr smith. Large metasurface aperture for millimeter wave computational. In contrast to traditional imaging, computational imaging systems involve a tight integration of the sensing system and the computation in order to form the images of interest. By integrating the measurement process directly into the machinelearning pipeline that processes the data, we learn optimal. By leveraging metamaterials and compressive imaging.
We introduce the concept of a metamaterial aperture, in which an underlying reference mode interacts with a designed metamaterial surface to produce a series of complex field patterns. Highly tunable hybrid metamaterials employing splitring. Frequencydiverse microwave imaging using planar mills. This designer aperture allows image compression to be performed on the physical hardware layer rather than in the postprocessing stage, thus averting the detector, storage, and transmission. Smith1 1center for metamaterials and integrate plasmonics, duke university, department of electrical and computer engineering, durham, nc 27708, usa. It can realize realtime control of electromagnetic wave and build multifunction radar array system.
Recently, a frequencydiverse, metamaterial based aperture has been introduced in the context of microwave and millimeter wave imaging. Smith, design considerations for a dynamic metamaterial aperture for computational imaging at microwave frequencies, j. Smith1,4 by leveraging metamaterials and compressive imaging, a lowprofile aperture capable of microwave imaging without lenses, moving parts, or phase shifters is demonstrated. Highly tunable hybrid metamaterials employing splitring resonators strongly coupled to graphene surface plasmons. These reflections effectively light up the objects, which we use to perform imaging. Antennas that combine hollow cavities and metamaterial apertures achieve. Their combined citations are counted only for the first article. Hfss simulation demonstrating the beam scanning capability of a metasurface antenna by periodically modulating the surface impedance 18. Among others, the implementation using a leakywave antenna is. In recent research trends, the modern computational imaging paradigms, including coded apertures 8, singlepixel imaging 9, and frequencydiverse imaging 10, have shown to be capable of. Metamaterial designs for applications in wireless power transfer and computational imaging. Osa comprehensive simulation platform for a metamaterial. Simulations of 2d metamaterial apertures for coherent computational imaging abstract.
Singlefrequency microwave imaging with dynamic metasurface. Simulations of 2d metamaterial apertures for coherent. The direct nearfield measurements of the double aperture show diffraction effects above 0. Pdf dynamically reconfigurable holographic metasurface. Feasibility and limits of wifi imaging proceedings of. Dynamically reconfigurable holographic metasurface aperture for a millscross monochromatic microwave camera okan yurduseven, 1, daniel l. Dynamically reconfigurable holographic metasurface. Osa design considerations for a dynamic metamaterial. This designer aperture allows image compression to be performed on the physical hardware layer rather than in the postprocessing stage, thus averting the detector, storage, and transmission costs associated with full. Each metamaterial resonator is integrated with a diode, enabling it to be.
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