Extremely Sub-Wavelength Negative Index Metamaterial

Zhang, Xu; Usi, Elvis; Khan, Suhail K.; Sadatgol, Mehdi; Güney, Durdu Ö.

doi:10.2528/pier15061807

Cited by 16 publications

(8 citation statements)

References 60 publications

(71 reference statements)

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“…8, we found the resonance frequency of the rigid metamaterial (6 mm × 6 mm resonator sandwiching a 1-m thick silicon-nitride) to be 33.4 MHz with a corresponding free-space wavelength ( 0 ) of 8.98 m. We calculated that the side length of the rigid resonator (6 mm) is shorter than 0 /1500, which is one of the smallest single-chip deepsubwavelength resonators reported thus far in the literature [44]. Although a theoretical work with a side length of 0 /1733 [45] and an experimental work with lumped capacitors having a side length of 0 /2000 [46]were reported, there is no experimental demonstration for a wireless self-resonant structure (i.e., without lumped element) electrically smaller than the structure presented here.…”

Section: Resonance Frequency and Q-factor Calculationsmentioning

confidence: 91%

Wireless deep-subwavelength metamaterial enabling sub-mm resolution magnetic resonance imaging

Alipour

Ünal

Atalar

et al. 2018

Sensors and Actuators A: Physical

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A wireless deep-subwavelength metamaterial architecture is proposed, modeled and demonstrated for a high-resolution magnetic resonance imaging (HR-MRI) application that is miniaturized to be resonant at approximately 0 /1500 dimensions. The proposed structure has the adjustable resonance frequency from 65 MHz to 5.5 GHz for the sub-cm footprint area (8 mm × 8 mm for this study) and provides a quality factor (Q-factor) of approximately 80 in free space for 123 MHz of operation. This structure consists of a cross-via metallized partial-double-layer metamaterial, sandwiching a dielectric thin film; this structure strongly localizes the electric field in this film and has a highly capacitive metal overlay that allows for a wide range of frequency adjustment. Although the achieved resonance frequencies enable a large number of applications, as a proof-of-concept demonstration, we experimentally showed the operation of this wireless metastructure in HR-MRI to highlight its precise frequency adjustment and signal-to-noise-ratio (SNR) improvement capabilities. The proposed metamaterial was found to maintains high Q-factors despite loading with a body-mimicking lossy phantom. The experimental results indicated that the proposed metastructure can be used as an SNR-enhancing device offering 15-fold SNR enhancements that allows for imaging of objects as small as 200 m in diameter in its vicinity, at an unprecedented level of resolution at the given DC field using standard head coils. As a result of its deep-subwavelength miniaturization accompanied by reasonable Q-factor with outstanding resonance frequency adjustment capability, this class of metastructure is proved to be an excellent candidate for in vivo medical applications.

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Section: Resonance Frequency and Q-factor Calculationsmentioning

confidence: 91%

Wireless deep-subwavelength metamaterial enabling sub-mm resolution magnetic resonance imaging

Alipour

Ünal

Atalar

et al. 2018

Sensors and Actuators A: Physical

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“…During the last decade, much research has been done on the development of left-handed Metamaterials (LHMs) due to their special and unique properties such as negative permittivity and permeability that are not found in nature [1,2]. Metamaterials are more frequently used in antenna and microwave circuits, in order to increase the bandwidth and miniaturize the antenna [3,4].…”

Section: Introductionmentioning

confidence: 99%

A Dual Band Slot Antenna for Wireless Applications With Circular Polarization

Pirooj¹,

Naser‐Moghadasi²,

Zarrabi³

et al. 2017

PIER C

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Abstract-In recently developed wireless communication systems, circular polarization (CP) antennas are used for communication links to reduce the natural loss effect in receivers. Therefore, in this paper, a dual-band microstrip slot antenna based on a parallel split ring resonator with circular and linear polarization which can be used for wireless and WiMAX applications is presented. The final antenna to design is based on inspired split ring resonators (SRR) to achieve circular polarization and compact size and with special parallel form of the SRR and straight feed line. We have achieved higher bandwidth in the requested frequency range with dual-band characteristics. The final antenna has a bi-directional pattern with circular polarization at the range of 2.9-3.65 GHz and bandwidths of 2-3.6 and 3.8-4.8 GHz with VSWR < 2 for WLAN, Bluetooth and radar applications for IEEE WLAN protocol with gain of 5-6 dBi, respectively. The size of the prototype patch antenna is 40×40 mm 2 . It is designed and fabricated on an FR-4 low cost substrate with ε r = 4.4 and a thickness of 1.6 mm. It is simulated using HFSS full wave software. In addition, the experimental results are presented and compared with simulation for VSWR, radiation patterns and axial ratio. The periodic analysis has been used for extracting the metamaterial parameters.

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“…Metamaterials provide unprecedented control of light for diverse applications such as wireless communications [1,2], novel optical materials [3][4][5][6][7][8], optical analog simulators [9,10], photovoltaics [11][12][13], quantum manipulation of light [14][15][16], and imaging [17][18][19][20][21][22][23][24][25][26], among many others. The extent to which an imaging system is capable of capturing high spatial frequency components of an incoming wave determines its resolution.…”

Section: Introductionmentioning

confidence: 99%

Bringing the ‘perfect lens’ into focus by near-perfect compensation of losses without gain media

et al. 2016

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In this paper, the optical properties and imaging performance of a non-ideal Pendry's negative index flat lens with a practical value for loss are studied. Analytical calculations of the optical properties of the lens are performed, and those results are used to further study the lens and corresponding imaging system numerically. An inverse filter emulating the plasmon injection scheme for loss compensation in negative index metamaterials is applied to the results from the imaging system, resulting in a perfect reconstruction of a previously unresolved image that demonstrates sub-diffraction-limited resolution.

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Extremely Sub-Wavelength Negative Index Metamaterial

Cited by 16 publications

References 60 publications

Wireless deep-subwavelength metamaterial enabling sub-mm resolution magnetic resonance imaging

Wireless deep-subwavelength metamaterial enabling sub-mm resolution magnetic resonance imaging

A Dual Band Slot Antenna for Wireless Applications With Circular Polarization

Bringing the ‘perfect lens’ into focus by near-perfect compensation of losses without gain media

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