Split-Ring-Resonator-Coupled Enhanced Transmission through a Single Subwavelength Aperture

Aydın, Koray; Cakmak, Atilla Ozgur; Şahin, Levent; Li, Z.; Bilotti, Filiberto; Vegni, Lucio; Özbay, Ekmel

doi:10.1103/physrevlett.102.013904

Cited by 106 publications

(77 citation statements)

References 25 publications

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“…9 Innovative models were developed for SRRs that were placed inside a small circular metallic aperture. 10 Subsequently, Aydin et al 11 proposed in a rather recent work an alternative method for transmission enhancement by putting a SRR in front of a subwavelength aperture.…”

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confidence: 99%

Enhanced transmission through a subwavelength aperture using metamaterials

Cakmak

Aydın

Çolak

et al. 2009

Applied Physics Letters

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We report an enhanced transmission through a single circular subwavelength aperture that is incorporated with a split ring resonator ͑SRR͒ at the microwave regime. Transmission enhancement factors as high as 530 were observed in the experiments when the SRR was located in front of the aperture in order to efficiently couple the electric field component of the incident electromagnetic wave at SRR's electrical resonance frequency. The experimental results were supported by numerical analyses. The physical origin of the transmission enhancement phenomenon was discussed by examining the induced surface currents on the structures. © 2009 American Institute of Physics. ͓DOI: 10.1063/1.3195074͔The interest in transmission through subwavelength apertures has recently rapidly increased. 1,2 The topic was addressed during the 1940s, where Bethe 3 put forward his theoretical analysis suggesting relatively poor transmission figures at the output side of a subwavelength aperture. The problem remained a major challenge until the pioneering work of Ebbesen et al. 4 From that moment on, the main focus has been shifted to elucidate the enhancement mechanism for subwavelength apertures. 5 Researchers have set out to identify the role of the surface plasmons and to offer physical explanations for the transmission enhancement phenomenon. 6,7 Methods have been sought to effectively guide the incoming electromagnetic ͑EM͒ wave into the subwavelength aperture that will in return result in enhanced transmission. A slightly different approach was adapted in a paper by Alu et al.,8 in which a matematerial cover over the aperture was theoretically shown to produce enhanced directional transmission by minimizing the diffraction losses. On the other hand, split ring resonators ͑SRRs͒ had already gained a well-established background in the metamaterial community. 9 Innovative models were developed for SRRs that were placed inside a small circular metallic aperture. 10 Subsequently, Aydin et al. 11 proposed in a rather recent work an alternative method for transmission enhancement by putting a SRR in front of a subwavelength aperture.We present here a more detailed analysis of the enhanced transmission process by focusing on an electrically coupled SRR that was made to cooperate with a subwavelength aperture. The resonator nature of the SRR was exploited to concentrate the fields in the vicinity of a subwavelength aperture to facilitate considerable improvement in the transmission factors at microwave frequencies. Besides, the dependence of the resonance frequency of the SRRs on the enhanced transmission was studied by employing three different SRRs in the simulations and experiments. Induced surface currents were calculated in order to discuss the enhancement mechanism. The transmission improvement figures were obtained as a function of various aperture radii.Three distinct SRR designs with the labeled dimensions, which are shown in Fig. 1͑a͒, were used. SRRs are deposited on a dielectric printed circuit board ͑PCB͒ with a thickness of 1.6 ...

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confidence: 99%

Enhanced transmission through a subwavelength aperture using metamaterials

Cakmak

Aydın

Çolak

et al. 2009

Applied Physics Letters

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“…[12]. Unlike the cases in the earlier studies [12][13][14] the SRR's resonance is not magnetically excited and the SRR is directly facing the metal screen. These factors found the ground for a more pronounced shift to be observed between the self-resonance frequency and the transmission enhancement frequency.…”

Section: Transmission Enhancement Phenomenonmentioning

confidence: 73%

“…Since the metamaterials provide the field localization opportunity in the vicinity of the resonance frequency, they can be considered as a strong candidate for a prospective corrugation design that boosts the transmission efficiency. Accordingly, Aydin et al experimentally showed a 740-fold transmission enhancement by inserting a split ring resonator inside the aperture [13]. Then, in one of our previous studies we discussed the physical origins of the enhancement in terms of the induced surface currents [14].…”

Section: Introductionmentioning

confidence: 92%

Near-field light localization using subwavelength apertures incorporated with metamaterials

Ates

Cakmak

Özbay

2012

Optics Communications

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We report strong near-field electromagnetic localization by using subwavelength apertures and metamaterials that operate at microwave frequencies. We designed split ring resonators with distinct configurations in order to obtain extraordinary transmission results. Furthermore, we analyzed the field localization and focusing characteristics of the transmitted evanescent waves. The employed metamaterial configurations yielded an improvement on the transmission efficiency on the order of 27 dB and 50 dB for the deep subwavelength apertures. The metamaterial loaded apertures are considered as a total system that offered spot size conversion ratios as high as 7.12 and 9.11 for the corresponding metamaterial configurations. The proposed system is shown to intensify the electric fields of the source located in the near-field. It also narrows down the electromagnetic waves such that a full width at half maximum value of λ/29 is obtained.

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“…Ebbesen, 1998 (18) . Several different aperture modifications have been suggested to maximize magnetic field strength at the aperture (19)(20)(21) . Increase of microwave transmission through an aperture was shown in a number of studies (22)(23)(24) by designing the aperture to operate at resonance.…”

Section: Introductionmentioning

confidence: 99%

Dielectric-Backed Aperture Resonators for X-Bandin vivoEPR Nail Dosimetry

Grinberg

Sidabras

Tipikin

et al. 2016

Radiat Prot Dosimetry

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A new resonator for X-band in vivo EPR nail dosimetry, the dielectric-backed aperture resonator (DAR), is developed based on rectangular TE 102 geometry. This novel geometry for surface spectroscopy improves at least a factor of 20 compared to a traditional non-backed aperture resonator. Such an increase in EPR sensitivity is achieved by using a non-resonant dielectric slab, placed on the aperture inside the cavity. The dielectric slab provides an increased magnetic field at the aperture and sample, while minimizing sensitive aperture resonance conditions. This work also introduces a DAR semi-spherical (SS)-TE 011 geometry. The SS-TE 011 geometry is attractive due to having twice the incident magnetic field at the aperture for a fixed input power. It has been shown that DAR provides sufficient sensitivity to make biologically relevant measurements both in vitro and in vivo. Although in vivo tests have shown some effects of physiological motions that suggest the necessity of a more robust finger holder, equivalent dosimetry sensitivity of approximately 1.4 Gy has been demonstrated.

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Split-Ring-Resonator-Coupled Enhanced Transmission through a Single Subwavelength Aperture

Cited by 106 publications

References 25 publications

Enhanced transmission through a subwavelength aperture using metamaterials

Enhanced transmission through a subwavelength aperture using metamaterials

Near-field light localization using subwavelength apertures incorporated with metamaterials

Dielectric-Backed Aperture Resonators for X-Bandin vivoEPR Nail Dosimetry

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