Effective Surface Plasmon Polaritons Induced by Modal Dispersion in a Waveguide

Li, Zhuo; Liu, Liangliang; Sun, Haibo; Sun, Yunhe; Gu, Changzhi; Chen, Xinlei; Liu, Yun; Luo, Yu

doi:10.1103/physrevapplied.7.044028

Cited by 60 publications

(43 citation statements)

References 31 publications

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“…Here, relying on the design of [10], we report an experimental verification of single-interface 'microwave plasmons' using waveguide structures without negative-ε media. We recently learned that the effective SPP propagation in a closed waveguide environment was also studied in [27], but in contrast with our work, in [27] the plasmons are supported by multiple interfaces. To the best of our knowledge, here we present the first experimental verification of a plasmonic-type waveguide (formed by only good metals and regular dielectrics) that supports single interface modes.…”

Section: Introductioncontrasting

confidence: 58%

Experimental verification of ‘waveguide’ plasmonics

et al. 2017

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Surface plasmons polaritons are collective excitations of an electron gas that occur at an interface between negative-ε and positive-ε media. Here, we report the experimental observation of such surface waves using simple waveguide metamaterials filled only with available positive-ε media at microwave frequencies. In contrast to optical designs, in our setup the propagation length of the surface plasmons can be rather long as low loss conventional dielectrics are chosen to avoid typical losses from negative-ε media. Plasmonic phenomena have potential applications in enhancing lightmatter interactions, implementing nanoscale photonic circuits and integrated photonics.

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Section: Introductioncontrasting

confidence: 58%

Experimental verification of ‘waveguide’ plasmonics

et al. 2017

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“…Different SSPPs transmission lines (TLs) structures have been proposed for filtering applications including rectangular gratings, semi‐elliptical grooves, etched grounds on coplanar waveguide, circular grooves, hybrid substrate integrated waveguide, and many others . Recently, modal‐dispersion‐induced effective SPPs have been proposed by designing transverse electric modes on rectangular waveguides . Regardless of dynamic advances in this field, some characteristics are of practical importance and yet challenging to be solved such as bulky structures due to additional conversion circuitry, higher asymptotic frequency, complicated manufacturing, high propagation loss, poor frequency selectivity, and low out‐band rejections (OBR).…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17][18][19] Recently, modal-dispersion-induced effective SPPs have been proposed by designing transverse electric modes on rectangular waveguides. 20 Regardless of dynamic advances in this field, some characteristics are of practical importance and yet challenging to be solved such as bulky structures due to additional conversion circuitry, higher asymptotic frequency, complicated manufacturing, high propagation loss, poor frequency selectivity, and low out-band rejections (OBR).…”

Section: Introductionmentioning

confidence: 99%

Novel crest‐trough shaped spoof surface plasmon polaritons for low pass filtering applications

Anwar

Mao

Ning

2019

Micro & Optical Tech Letters

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In this letter, a novel periodic crest‐trough (CT) shaped groove structure is proposed to excite and propagate spoof surface plasmon polaritons (SSPPs) at microwave frequency. Such a groove shape solves the problem of high transmission losses found in traditional microstrip transmission lines and presents tighter field confinement. Lower dispersion band is achieved by proposed CT‐SSPPs as compared to traditional structures, with 28% reduced asymptotic frequency than rectangular groove. Influence of some geometrical parameters is also explored. Further, planar low‐pass plasmonic filters with low reflection and high efficiency are investigated with compact transition circuitry for smooth and fast conversion between SSPPs and guided waves. To validate the proposed performance, two plasmonic filter structures are fabricated and measured. Full agreement is observed between the simulated and measured results for which reflection coefficient is lower than −10 dB in passband up to 3.07 and 2.52 GHz, respectively for both filters. The rejection level is higher than −15 dB in the whole stopband.

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“…A remarkable device, termed hyperlens, is capable of converting the evanescent harmonics into propagating waves through curved geometry [13][14][15][16] or gratings [17,18].In this way, superresolution pictures are formed in the far field. The hyperlens can be constructed by periodic arrangement of plasmonics materials and common dielectrics [11][12][13][14][15][16][17][18][19][20].When it comes to the longer wavelength, for example, the terahertz domain, which has great potential in non-destructive testing and manufacturing quality control, the metal behaves as perfect electric conductor [21,22]. To mimic the intriguing properties of natural plasmonic effect, by texturing the geometrical features of high-conductivity metal, the concept of spoof surface plasmons (SSP) [23] is developed with low loss and high flexibility.…”

mentioning

confidence: 99%

Far-Field Subwavelength Resolution Imaging by Spatial Spectrum Sampling

et al. 2019

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Imaging below the diffraction limit is always a public interest because of the restricted resolution of conventional imaging systems. To beat the limit, evanescent harmonics decaying in space must participate in the imaging process. Here, we introduce the method of spatial spectrum sampling, a novel far-field superresolution imaging method for microwave and terahertz regime. Strong dispersion and momentum conservation allow the spoof surface plasmon polaritons (SSP) structure to become a sensitive probe for spatial harmonics. This enables that the spatial information of the targets including both propagating and evanescent components, can be extracted by tuning and recording SSP in the far field. Then, the subwavelength resolution is constructed by the inversed Fourier transform of the sampled spatial spectrum. Using the modified subwavelength metallic grating as the probe, a far-field resolution of 0.17 is numerically and experimentally verified, and two-dimensional imaging ability is also fully discussed. The imaging ability and flexibility can be further optimizing the SSP structures.We are confident that our working mechanism will have great potentials in the superresolution imaging applications in the microwave and terahertz frequency range. IntroductionAchieving spatial resolution without limited by the working wavelength always attracts tremendous attention, due to the pervasive applications of imaging. However, the diffraction limit indicates the fine features smaller than half a wavelength are carried by the evanescent harmonics [1], whose amplitude exponentially decays with distance. The contribution of these harmonics is negligible when the imaging distance larger than a wavelength. To circumvent the inherent limitation, the optical elements should own ability of capturing the evanescent part of spatial information. By mechanically canning a sensitive probe, the near-field microscope (NFSM) [2-4] can well surpass the diffraction limit for thousand times, but the imaging operation is very time-wasting. To obtain superresolution images in a single shot, the concept of perfect lens is theoretically exploited by Pendry [1], utilizing the plasmonic effect in materials to enhance the evanescent waves [5,6]. Soon after this imaging method is experimentally verified at optical wavelength by plasmonic slabs, such as the noble metal [7,8] and dielectrics [9]. Although the imaging ability of such lenses can be further enhanced by other methods [10], the working distance is still subject to the near field [11,12]. A remarkable device, termed hyperlens, is capable of converting the evanescent harmonics into propagating waves through curved geometry [13][14][15][16] or gratings [17,18].In this way, superresolution pictures are formed in the far field. The hyperlens can be constructed by periodic arrangement of plasmonics materials and common dielectrics [11][12][13][14][15][16][17][18][19][20].When it comes to the longer wavelength, for example, the terahertz domain, which has great potential in non-destructive test...

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Effective Surface Plasmon Polaritons Induced by Modal Dispersion in a Waveguide

Cited by 60 publications

References 31 publications

Experimental verification of ‘waveguide’ plasmonics

Experimental verification of ‘waveguide’ plasmonics

Novel crest‐trough shaped spoof surface plasmon polaritons for low pass filtering applications

Far-Field Subwavelength Resolution Imaging by Spatial Spectrum Sampling

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