Tuning of superconducting niobium nitride terahertz metamaterials

Wu, Jingbo; Jin, Biaobing; Xue, Yu-hua; Zhang, Caihong; Dai, Hao; Zhang, Labao; Cao, Chunhong; Kang, Lin; Xu, Wei; Chen, Jian; Wu, Peiheng

doi:10.1364/oe.19.012021

Cited by 63 publications

(44 citation statements)

References 23 publications

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“…It has been shown that losses in metamaterials, working in and below the THz frequency range, can be greatly reduced if metallic structures are replaced by superconducting ones [1]. Additionally, superconducting meta-atoms exhibit an intrinsic tunability of their resonance frequency by magnetic field and temperature [2][3][4]. However, in both cases, the tunability arises from a suppression of the superconducting order parameter, i.e.…”

Section: Introductionmentioning

confidence: 99%

A one-dimensional tunable magnetic metamaterial

Butz¹,

Jung²,

Filippenko³

et al. 2013

Opt. Express

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Abstract:We present experimental data on a one-dimensional superconducting metamaterial that is tunable over a broad frequency band. The basic building block of this magnetic thin-film medium is a single-junction (rf-) superconducting quantum interference device (SQUID). Due to the nonlinear inductance of such an element, its resonance frequency is tunable in situ by applying a dc magnetic field. We demonstrate that this results in tunable effective parameters of our metamaterial consisting of 54 rf-SQUIDs. In order to obtain the effective magnetic permeability µ r,eff from the measured data, we employ a technique that uses only the complex transmission coefficient S 21 .

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Section: Introductionmentioning

confidence: 99%

A one-dimensional tunable magnetic metamaterial

Butz¹,

Jung²,

Filippenko³

et al. 2013

Opt. Express

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“…In recent works, the THz MMs made from superconductor exhibited wideband tuning properties by thermal or magnetic-field switching. [14][15][16][17][18][19] Furthermore, the use of superconductor serves as a good method to suppress the Ohmic loss of MMs. Recently, combined with superconductor dark resonators and normal-metal radiative resonators, the hybrid MMs at microwave regime with tunable EIT-like response have been created.…”

mentioning

confidence: 99%

“…The NbN films typically have a critical temperature (T c ) of 15.8 K. The film properties and pattern formations are described in Ref. 19. Using THz time domain spectroscopy (TDS) system, the THz transmission spectra are measured over a temperature range of 8-300 K. And, a bared MgO substrate is measured as reference.…”

mentioning

confidence: 99%

Superconducting terahertz metamaterials mimicking electromagnetically induced transparency

Wu¹,

Jin²,

Wan³

et al. 2011

Applied Physics Letters

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101

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We designed and fabricated planar terahertz (THz) metamaterials made from superconducting NbN films to mimic electromagnetically induced transparency (EIT) system. They are characterized using THz time domain spectroscopy over a temperature range from 8 to 300 K. High transmittance and large delay-bandwidth product at transparency window are demonstrated, which mainly arise from the enhanced coupling and decreased damping in superconducting state. The EIT-like spectral response could be tuned in a wide frequency range. By applying two dark resonators with different resonance frequencies coupled with a radiative resonator, we experimentally demonstrated the planar metamaterials mimicking four-level EIT system.

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“…Their operation frequency spans a huge range, from zero [51,52,53,54] to microwaves [55,18,56,19,32] and to Terahertz [11,12,37,57,38,39,40,15,58,59,41,42] and visible [45] frequencies. Moreover, researchers rely on particular superconducting devices to access the trully quantum metamaterial regime [30,60,61,62,63].…”

Section: Introductionmentioning

confidence: 99%

Wide-band tuneability, nonlinear transmission, and dynamic multistability in SQUID metamaterials

2014

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Superconducting metamaterials comprising rf SQUIDs (Superconducting QUantum Interference Devices) have been recently realized and investigated with respect to their tuneability, permeability and dynamic multistability properties. These properties are a consequence of intrinsic nonlinearities due to the sensitivity of the superconducting state to external stimuli. SQUIDs, made of a superconducting ring interrupted by a Josephson junction, possess yet another source of nonlinearity, which makes them widely tuneable with an applied dc dlux. A model SQUID metamaterial, based on electric equivalent circuits, is used in the weak coupling approximation to demonstrate the dc flux tuneability, dynamic multistability, and nonlinear transmission in SQUID metamaterials comprising non-hysteretic SQUIDs. The model equations reproduce the experimentally observed tuneability patterns, and predict tuneability with the power of an applied ac magnetic magnetic field. Moreover, the results indicate the opening of nonlinear frequency bands for energy transmission through SQUID metamaterials, for sufficiently strong ac fields.

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Tuning of superconducting niobium nitride terahertz metamaterials

Cited by 63 publications

References 23 publications

A one-dimensional tunable magnetic metamaterial

A one-dimensional tunable magnetic metamaterial

Superconducting terahertz metamaterials mimicking electromagnetically induced transparency

Wide-band tuneability, nonlinear transmission, and dynamic multistability in SQUID metamaterials

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