Periodic and Guiding Structures at Microwave Frequencies

Harvey, A. F.

doi:10.1109/tmtt.1960.1124658

Cited by 186 publications

(98 citation statements)

References 146 publications

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confidence: 99%

“…Although some designs based on metal wires or strips are able to support surface leaky modes that have some degree of lateral confinement at terahertz frequencies (12,13), the concept of plasmonic metamaterials has proven very useful in the production of highly confined surface electromagnetic (EM) waves at low frequencies (14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27). Early work in this area can be traced back to the 1950s and 1960s, when corrugated metal structures were used to generate surface EM waves at microwave frequencies (14,15). Generally, plasmonic metamaterials consist of metal surfaces decorated with 1D arrays of subwavelength grooves, 2D arrays of subwavelength holes/dimples, or 3D metal wires in which a periodic array of radial grooves is drilled (16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26).…”

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confidence: 99%

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Conformal surface plasmons propagating on ultrathin and flexible films

Shen

Cui

Martín-Cano

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

774

428

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Surface plasmon polaritons (SPPs) are localized surface electromagnetic waves that propagate along the interface between a metal and a dielectric. Owing to their inherent subwavelength confinement, SPPs have a strong potential to become building blocks of a type of photonic circuitry built up on 2D metal surfaces; however, SPPs are difficult to control on curved surfaces conformably and flexibly to produce advanced functional devices. Here we propose the concept of conformal surface plasmons (CSPs), surface plasmon waves that can propagate on ultrathin and flexible films to long distances in a wide broadband range from microwave to mid-infrared frequencies. We present the experimental realization of these CSPs in the microwave regime on paper-like dielectric films with a thickness 600-fold smaller than the operating wavelength. The flexible paper-like films can be bent, folded, and even twisted to mold the flow of CSPs. metamaterials | plasmonics | waveguiding S urface plasmon polaritons (SPPs) are highly localized surface waves (1) that propagate along the interface between two materials whose real parts of electric permittivity have opposite signs, and decay exponentially in the transverse direction. At optical frequencies, metals behave like plasma with negative permittivity, and thus SPPs exist on metal-air interfaces (2, 3). Owing to their ability to confine light in a subwavelength scale with high intensity, SPPs can be used to overcome the diffraction limit, miniaturize photonic components, and build highly integrated optical components and circuits. Thus, they have found (or have potential) applications in biomedical sensing, near-field microscopy, optoelectronics, photovoltaics, and nanophotonics (4-11).In the far-infrared, terahertz, and microwave frequency bands, metals behave akin to perfectly electrical conductors (PECs), and thus SPPs cannot be supported by a metal surface. Although some designs based on metal wires or strips are able to support surface leaky modes that have some degree of lateral confinement at terahertz frequencies (12, 13), the concept of plasmonic metamaterials has proven very useful in the production of highly confined surface electromagnetic (EM) waves at low frequencies (14-27). Early work in this area can be traced back to the 1950s and 1960s, when corrugated metal structures were used to generate surface EM waves at microwave frequencies (14, 15). Generally, plasmonic metamaterials consist of metal surfaces decorated with 1D arrays of subwavelength grooves, 2D arrays of subwavelength holes/dimples, or 3D metal wires in which a periodic array of radial grooves is drilled (16-26). Recently, an alternative "spoof" SPP structure using complementary split-ring resonators as the unit cell elements has been proposed theoretically (27). The surface EM modes decorated by all of these plasmonic metamaterials are called spoof SPPs, or designer SPPs, because their properties are very similar to those of SPPs at optical frequencies. An important advantage of this metamaterial approach ...

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mentioning

confidence: 99%

mentioning

confidence: 99%

Conformal surface plasmons propagating on ultrathin and flexible films

Shen

Cui

Martín-Cano

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

774

428

View full text Add to dashboard Cite

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“…The output spectrum of the metal strip grating can be represented as [17], (1) Where E in is the input spectrum of the incident wave, B n is the weighting function dependent upon the geometry of the grating and L is the period of the grating. It states that the output spectrum is the weighted copies of the input spectrum shifted by integer multiples of the grating wave number 2π/L.…”

Section: Figure 4 Effect Of Variation In Grating Thickness W On Reflmentioning

confidence: 99%

“…Electromagnetic wave propagation through periodic structures is well known to the research community over the last century [1]. A periodic arrangement of metallic strips has been used for achieving variable permittivity values and constitutes a well-known category named as artificial dielectrics.…”

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confidence: 99%

Grating-based Dipole Antenna Configuration for High Gain Directional Radiation characteristics

Sarin¹,

Jayakrishnan

Aanandan³

et al. 2017

AEM

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The experimental and simulation studies of the radiation performance enhancement of a dipole antenna using metal strip grating are presented in this paper. The subwavelength imaging configuration of the metal strip grating is utilized for enhancing the radiation performance of the dipole antenna working in the S-band. The resultant design shows a gain of 9 dBi and a front to back ratio of -23 dB at resonance. The coupling between electric and magnetic resonances provides the necessary impedance matching performance when the antenna is brought in the vicinity of the grating.

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“…Surface electromagnetic waves are propagating solutions to Maxwell's equations in which the electromagnetic energy is bound to an interface between two different media and travels without radiation loss [1,2]. Common examples are the Sommerfeld wave, a radial cylindrical wave [3][4][5][6], and the Zenneck wave [7,8], all of which are bound to a conducting interface and propagate without radiation.…”

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Controlling Gigahertz and Terahertz Surface Electromagnetic Waves with Metamaterial Resonators

et al. 2011

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We computationally and experimentally investigate the use of metamaterial resonators as bandpass filters and other components that enable control of guided surface electromagnetic waves. The guided surface electromagnetic wave propagates on a planar Goubau line, launched via a coplanar waveguide coupler with 50 impedance. Experimental samples targeted for either microwave or terahertz frequencies are measured and shown to be in excellent agreement with simulations. Metamaterial elements are designed to absorb energy only of the planar Goubau line and yield narrow-band resonances with relatively high quality factors. Two independent configurations of coupled metamaterial elements are demonstrated that modify the otherwise flat transmission spectrum of the planar Goubau line. By physically shunting the capacitive gaps of the coupled metamaterial elements, we demonstrate the potential for a large dynamic range in transmissivity, suggesting the use of this configuration for highbandwidth terahertz communications.

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Periodic and Guiding Structures at Microwave Frequencies

Cited by 186 publications

References 146 publications

Conformal surface plasmons propagating on ultrathin and flexible films

Conformal surface plasmons propagating on ultrathin and flexible films

Grating-based Dipole Antenna Configuration for High Gain Directional Radiation characteristics

Controlling Gigahertz and Terahertz Surface Electromagnetic Waves with Metamaterial Resonators

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