Plasmon mode transformation in modulated-index metal-dielectric slot waveguides

Feng, Ning‐Ning; Negro, Luca Dal

doi:10.1364/ol.32.003086

Cited by 26 publications

(9 citation statements)

References 14 publications

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“…Optical waveguides guiding surface plasmon polaritons have been a subject of extensive studies, and different types of metal-dielectric waveguides have been suggested theoretically and demonstrated experimentally (see, e.g., Refs. [5][6][7][8]. The simplest plasmonic waveguide is an interface between metal and insulator which supports plasmon polaritons; however, due to losses in metal, an excited plasmon can propagate for only a very short distance [5,9].…”

Section: Introductionmentioning

confidence: 99%

Backward and forward modes guided by metal-dielectric-metal plasmonic waveguides

et al. 2010

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to 66.165.46.178. Terms of Use: http://spiedl.org/termsBackward and forward modes guided by metal-dielectric-metal plasmonic waveguides Abstract. We revisited the problem of the existence of plasmonic modes guided by metaldielectric-metal slot waveguides. For the case of lossless slot waveguides, we classify the guided modes in the structure with the metal dispersion and found that, in a certain parameter range, three different guided modes coexist at a fixed frequency, two (symmetric and antisymmetric) forward propagating modes and the third, backward propagating antisymmetric mode. We study the properties of the forward and backward plasmonic guided modes in the presence of realistic losses, and discuss the importance of evanescent modes in lossy structures.

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Section: Introductionmentioning

confidence: 99%

Backward and forward modes guided by metal-dielectric-metal plasmonic waveguides

et al. 2010

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“…Surface plasmon polaritons (SPPs), excitons propagating at the interface between a metal and dielectric, have been proposed to overcome the diffraction limit and concentrate light efficiently [4,5]. SPPs based focusing configurations such as dielectric wedges [6], tapered metal lateral waveguides [7]/tips [8][9][10]/grooves [11,12]/pyramids [13] and tapered metal-insulator-metal (MIM) waveguides [14][15][16]/closed gaps [17]/dimple lens [18] have been proposed theoretically or demonstrated experimentally. However, maximum enhancements among these proposals are always accompanied by a requirement of a sub-10 nm taper width, which is high-cost and difficult to fabricate.…”

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confidence: 99%

Plasmonic Tamm states: dual enhancement of light inside the plasmonic waveguide

et al. 2014

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A type of Tamm states inside metal-insulator-metal (MIM) waveguides is proposed. An impedance based transfer matrix method is adopted to study and optimize it. With the participation of the plasmonic Tamm states, fields could be enhanced twice: the first is due to the coupling between a normal waveguide and a nanoscaled plasmonic waveguide and the second is due to the strong localization and field enhancement of Tamm states. As shown in our 2D coupling configuration, |E| 2 is enhanced up to 1050 times when 1550 nm light is coupled from an 300 nm Si slab waveguide into an 40 nm MIM waveguide. Optical Tamm states (OTSs, also known as Tamm plasmons), was recently discovered at the interface between a metal film and an 1D photonic crystal (PC) [21,22]. Unlike the only TM-polarized SPPs, OTSs can be excited directly by normal incidence for both TM and TE-polarized waves. The light frequency lies in the band gap of the PC. Fields are confined and amplified at the metal/PC interface due to the interference of light reflected from both sides. Owing to the strong field enhancement, applications such as lasers [23,24], all-optical switches [25], solar cells [26], Faraday rotation [27,28] and electromagnetically induced transparency (EIT) [29] have been proposed.In this letter, we introduce and demonstrate a type of Tamm states in plasmonic metal-insulator-metal (MIM) waveguides. In analogy with OTSs in an optical system, such states exist in a plasmonic system, as which we call plasmonic Tamm states (PTSs). We form Bragg reflectors (BR) by periodically change the dielectric materials in MIM [30]. Only if the phase matching condition r left r right = 1 is fulfilled, PTSs can be generated in accompany with fields enhancement at the interface between the MIM BR and the MIM end [21]. Hence, fields can be enlarged twice during the focusing process: the first enhancement is due to the coupling between a normal dielectric waveguide and a nanoscaled MIM waveguide and the second enhancement is due to the strong localization and amplification of PTSs. Fig. 1. Sketch of the plasmonic Tamm states generation configuration. In order to fulfill the phase matching condition, ε 2 should be larger than ε 1 .The scheme of the PTSs generation configuration is illustrated in Fig. 1. SPPs are excited at the left side. The operation wavelength is 1550 nm. The dielectric core has a width of w = 40 nm. In this regime, the odd TM mode (E x is odd, E y and H z are even) is the only mode of this MIM structure with a dispersion relation [4]where ε m and ε d are the dielectric constants of the metal and the dielectric, respectively. k m and k d denote the re-1 arXiv:1401.5230v1 [physics.optics]

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“…The MIS waveguide is formed by the gold, Si 3 N 4 , and Si layers. It is a kind of a hybrid plasmonic waveguide [13][14][15][16]. The energy of the MIS waveguide mode (MISM) is highly confined in the Si 3 N 4 layer, and it almost does not exist above the gold layer.…”

Section: Structurementioning

confidence: 99%

Theoretical Investigation of an Interferometer-type Plasmonic Biosensor Using a Metal-insulator-silicon Waveguide

Kwon

2010

Plasmonics

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This work proposes and investigates theoretically a biosensor that is an integrated plasmonic Mach-Zehnder interferometer. The biosensor consists of three sections. The first and third sections are input and output dielectric waveguides whose core is a silicon film. The second section is a combination of a surface plasmon polariton waveguide and a metal-insulator-silicon waveguide, which are separated by a thick gold film. The former and the latter function as sensing and reference arms, respectively. The latter supports a mode whose fields are highly enhanced in a thin insulator, silicon nitride film, and it has relatively small propagation loss. It is shown that the biosensor has insertion loss lower than 2 dB, and that it is very compact since the length of its second section for sensing is shorter than 6 μm. In addition, it is discussed that it can be easily implemented by using simple fabrication processes. Analyzed are the characteristics of sensing a refractive index change of liquid covering the biosensor. Despite its compactness, they are similar to those of previous surface plasmon interferometers. Also, its characteristics as a DNA sensor are analyzed. The analysis demonstrates that the biosensor can detect sensitively target single-stranded DNAs whose total weight is smaller than 10 fg.

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Plasmon mode transformation in modulated-index metal-dielectric slot waveguides

Cited by 26 publications

References 14 publications

Backward and forward modes guided by metal-dielectric-metal plasmonic waveguides

Backward and forward modes guided by metal-dielectric-metal plasmonic waveguides

Plasmonic Tamm states: dual enhancement of light inside the plasmonic waveguide

Theoretical Investigation of an Interferometer-type Plasmonic Biosensor Using a Metal-insulator-silicon Waveguide

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