Single superconducting split-ring resonator electrodynamics

Ricci, Michael; Anlage, Steven M.

doi:10.1063/1.2216931

Cited by 53 publications

(54 citation statements)

References 25 publications

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“…As the normal metal SRR dimensions decrease, for example, losses will increase and the frequency bandwidth of µ eff (f ) < 0 will vanish. This does not happen with superconducting SRRs until the critical current density is reached 7 . The experiments presented here were carried out in an Ag-plated Cu X-band waveguide with inner dimensions of 22.86 × 10.16 mm 2 containing a single Nb SRR.…”

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confidence: 99%

“…7 . Another method of tuning the frequency bandwidth of µ eff (f ) < 0 of the Nb SRR involves modifying the inductance and loss in the Nb film with magnetic vortices.…”

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confidence: 99%

“…As stated earlier, the equation for µ eff (f ) contains a limited frequency bandwidth where µ eff (f ) < 0. This frequency bandwidth may be tuned in frequency by changing the temperature 7 , by changing a dc magnetic field applied parallel to the applied transverse magnetic field, B, shown in Fig. 1(a), or by increasing the rf power, P rf , of the applied electromagnetic signal.…”

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confidence: 99%

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Tunability of Superconducting Metamaterials

Ricci

Prozorov

et al. 2007

IEEE Trans. Appl. Supercond.

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Metamaterials are artificial structures with unique electromagnetic properties, such as relative dielectric permittivity and magnetic permeability with values less than 1, or even negative. Because these properties are so sensitive to loss, we have developed metamaterials comprised of superconducting waveguides, wires, and split-ring resonators. An important requirement for applications of these metamaterials is the ability to tune the frequency at which the unique electromagnetic response occurs. In this paper we present three methods (unique to superconductors) to accomplish this tuning: temperature, dc magnetic field, and rf magnetic field. Data are shown for dc and rf magnetic field tuning of a single Nb split-ring resonator (SRR). It was found that the dc field tuning was hysteretic in the resonant frequency data, while the quality factor, Q, was less hysteretic. The rf power tuning showed no hysteresis, but did show supression of the Q at high power. Magnetooptical images reveal inhomogeneous magnetic vortex entry in the dc field tuning, and laser scanning photoresponse images for a YBa2Cu3O 7−δ SRR reveals the current distribution in the rings.

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“…7 . Another method of tuning the frequency bandwidth of µ eff (f ) < 0 of the Nb SRR involves modifying the inductance and loss in the Nb film with magnetic vortices.…”

mentioning

confidence: 99%

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confidence: 99%

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Tunability of Superconducting Metamaterials

Ricci

Prozorov

et al. 2007

IEEE Trans. Appl. Supercond.

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“…There have been only a few preliminary recent metamaterial demonstrations incorporating superconducting films, but the interest is growing. Part of the goal of superconducting metamaterials, mainly focusing on the microwave frequency range, is to reduce the resonant losses and improve the resonance quality factor [128][129][130][131], since at low temperature superconducting materials possess superior conductivity than metals at frequencies up to low THz. It was found that the metamaterial resonance, including resonance strength and frequency, could be tuned by applying external dc or rf magnetic fields [132,133] in addition to changing the temperature.…”

Section: Superconducting Metamaterialsmentioning

confidence: 99%

Manipulation of terahertz radiation using metamaterials

Chen

O’Hara

Azad

et al. 2011

Laser & Photonics Reviews

159

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During the past decade electromagnetic metamaterials have realized many exotic phenomena that are difficult or impossible using naturally occurring materials. It is their resonantly enhanced interaction with electromagnetic waves that underpins their attractive qualities, which are increasingly important in the terahertz frequency range. Passive and active terahertz metamaterials and devices have enabled novel functionality and unprecedented terahertz device performance. These demonstrations prove their potential to address the so-called terahertz gap, a technology vacuum associated with the deficiency of natural materials with a desirable terahertz response.

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“…Nonetheless, RF metamaterials have been sought to improve the performance of magnetic resonance imaging (MRI) devices 6,7 , magnetoinductive lenses 8 , microwave antennas 9 , delay-lines 10 , and resonators 11 . Insofar as obtaining RF metamaterials substantially relies on the development of compact and scalable metamaterial atoms that are amenable to conventional microfabrication techniques, many superconducting structures have been recently introduced and tested for metamaterial applications in the RF/microwave regime [12][13][14][15][16][17][18][19][20][21] , motivated by their low-losses and deep sub-wavelength sizes.…”

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confidence: 99%

High-temperature superconducting multi-band radio-frequency metamaterial atoms

et al. 2013

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We report development and measurement of a micro-fabricated compact high-temperature superconducting (HTS) metamaterial atom operating at a frequency as low as ∼ 53MHz. The device is a planar spiral resonator patterned out of a YBa 2 Cu 3 O 7−δ (YBCO) thin film with the characteristic dimension of ∼ λ 0 /1000, where λ 0 is the free-space wavelength of the fundamental resonance. While deployment of an HTS material enables higher operating temperatures and greater tunability, it has not compromised the quality of our spiral metamaterial atom and a Q as high as ∼ 1000 for the fundamental mode, and ∼ 30000 for higher order modes, are achieved up to 70K. Moreover, we have experimentally studied the effect of the substrate by comparing the performance of similar devices on different substrates.Realization of metamaterials based on sub-wavelength artificial electromagnetic structures has attracted much attention and efforts for a variety of applications 1,2 . This interest applies virtually to the entire span of the electromagnetic spectrum from radio-frequency (RF) up to visible and ultraviolet wavelengths. Nevertheless, at the low-frequency limit, i.e. in the RF regime, where the free-space wavelength of signals ranges from tens of centimeters to meters, the constituent elements of metamaterials, referred to as the metamaterial atoms, are often bulky, which hinders the implementation of scalable RF metamaterials. In addition, RF resonant structures traditionally exhibit low quality factors due to significant dissipation in their bulky structures 3,4 . Since both requirements of scalability/compactness and low dissipation have proved to be challenging to achieve for RF metamaterials, few studies have concerned metamaterials at the low-frequency part of the electromagnetic spectrum 5 . Nonetheless, RF metamaterials have been sought to improve the performance of magnetic resonance imaging (MRI) devices 6,7 , magnetoinductive lenses 8 , microwave antennas 9 , delay-lines 10 , and resonators 11 . Insofar as obtaining RF metamaterials substantially relies on the development of compact and scalable metamaterial atoms that are amenable to conventional microfabrication techniques, many superconducting structures have been recently introduced and tested for metamaterial applications in the RF/microwave regime 12-21 , motivated by their low-losses and deep sub-wavelength sizes.Recently, we have demonstrated superconducting RF metamaterials based on Niobium (Nb) spiral resonators as a viable means to realize efficient metamaterials at low frequencies presenting both a compact physical structure and low loss 22,23 . Given that Nb is a low-temperature superconductor (LTS) whose transition temperature is ∼9.2K, development of analogous superconducting metamaterial atoms capable of functioning at the temperature of liquid nitrogen, 77K, is clearly a technological advantage. Furthermore, accessing a wider range of superconducting temperature allows greater convenience and effectiveness in tuning the properties of the metamaterial ato...

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Single superconducting split-ring resonator electrodynamics

Cited by 53 publications

References 25 publications

Tunability of Superconducting Metamaterials

Tunability of Superconducting Metamaterials

Manipulation of terahertz radiation using metamaterials

High-temperature superconducting multi-band radio-frequency metamaterial atoms

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