Super Mode Propagation in Low Index Medium

Alam, Md. Zahangir; Meier, Joachim; Aitchison, J. S.; Mojahedi, Mo

doi:10.1109/cleo.2007.4453278

Cited by 32 publications

(35 citation statements)

References 3 publications

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“…These structures are developed by implementing a material with low refractive index (SiO 2 ), between a metal (Ag), and another material with higher refractive index (Si). This structure supports a guided plasmonic TM mode, with high confinement inside the material with lower refractive index [22][23][24][25][26]. When the guided hybrid plasmonic mode enters to the antenna, it transforms to a radiating mode due to the periodic slots provided in the design (See Fig.…”

Section: Analysis and Designmentioning

confidence: 89%

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Highly Directive Hybrid Plasmonic Leaky Wave Optical Nano-Antenna

Yousefi¹

2014

PIER Letters

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Abstract-A novel traveling-wave hybrid plasmonic optical antenna is proposed for operation at the standard telecommunication wavelength of 1550 nm and with the frequency bandwidth of more than 16 THz. A highly directive radiation pattern with 15.2 dBi directivity and 82% efficiency is achieved. The developed antenna benefits from high directivity advantage of leaky-wave antennas, and low loss properties and confinement of hybrid plasmonic structures. The designed device can have applications in inter/intera chip optical interconnect, and absorption enhancement of photodetectors, and solar cells.

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Section: Analysis and Designmentioning

confidence: 89%

“…1. As shown in this figure, the antenna is designed based on the hybrid plasmonic structure [22][23][24][25][26]. These structures are developed by implementing a material with low refractive index (SiO 2 ), between a metal (Ag), and another material with higher refractive index (Si).…”

Section: Analysis and Designmentioning

confidence: 99%

Highly Directive Hybrid Plasmonic Leaky Wave Optical Nano-Antenna

Yousefi¹

2014

PIER Letters

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“…Recently we have proposed a hybrid plasmonic waveguide (HPWG) that consists of a metal plane separated from a high index material by a low index spacer [10,11]. The proposed guide offers a number of advantages: it is very compact and provides a better compromise between loss and confinement compared to purely plasmonic guides.…”

Section: Introductionmentioning

confidence: 99%

Compact low loss and broadband hybrid plasmonic directional coupler

Alam¹,

Caspers²,

Aitchison³

et al. 2013

Opt. Express

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Abstract:We propose a novel broadband coupler for silicon photonics using a hybrid plasmonic waveguide section. The hybrid plasmonic waveguide is used to create an asymmetric section in the middle of a silicon nanowire waveguide coupler to introduce a phase delay to allow for a 3-dB power coupling ratio over a 150 nm bandwidth around 1.55 µm. The device is very compact (<8.5 µm) and has a low insertion loss (<0.15 dB).

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“…Unfortunately, since the majority of these nano-waveguides rely on plasmonic materials to confine the radiation beyond the diffraction limit, the propagation of nano-constrained radiation is often limited by material losses. While the emerging field of active plasmonics [6] promises to overcome absorption limitations in nano-waveguides, full compensation of losses appears to be experimentally challenging [7].In this Letter we focus on gain-assisted phenomena beyond absorption compensation and study the perspectives of controlling the dispersive properties of active nanoscale waveguides. We show that even relatively weak material gain, which is unable to compensate losses, is capable of producing large variations of the group velocity, bringing such exotic phenomena as slow (0 < v g ≪ c) and ultra-fast (v g < 0) light [8,9,10] to the nanoscale domain.…”

mentioning

confidence: 99%

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confidence: 99%

Gain-Assisted Slow to Superluminal Group Velocity Manipulation in Nanowaveguides

Govyadinov

Podolskiy

2006

Phys. Rev. Lett.

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We study the energy propagation in subwavelength waveguides and demonstrate that the mechanism of material gain, previously suggested for loss compensation, is also a powerful tool to manipulate dispersion and propagation characteristics of electromagnetic pulses at the nanoscale. We show theoretically that the group velocity in lossy nano-waveguides can be controlled from slow to superluminal values by the material gain and waveguide geometry and develop an analytical description of the relevant physics. We utilize the developed formalism to show that gain-assisted dispersion management can be used to control the transition between "photonic-funnel" and "photonic-compressor" regimes in tapered nano-waveguides. The phenomenon of strong modulation of group velocity in subwavelength structures can be realized in waveguides with different geometries, and is present for both volume and surface-modes.Conventional optical fibers support propagating modes only when waveguide radius is sufficiently large [1]. In contrast to this behavior, plasmonic systems, anisotropybased waveguides, nanoparticle chains, and optical coaxial cables [2,3,4,5] support energy propagation even when the typical waveguide cross-section is much smaller than the wavelength. Unfortunately, since the majority of these nano-waveguides rely on plasmonic materials to confine the radiation beyond the diffraction limit, the propagation of nano-constrained radiation is often limited by material losses. While the emerging field of active plasmonics [6] promises to overcome absorption limitations in nano-waveguides, full compensation of losses appears to be experimentally challenging [7].In this Letter we focus on gain-assisted phenomena beyond absorption compensation and study the perspectives of controlling the dispersive properties of active nanoscale waveguides. We show that even relatively weak material gain, which is unable to compensate losses, is capable of producing large variations of the group velocity, bringing such exotic phenomena as slow (0 < v g ≪ c) and ultra-fast (v g < 0) light [8,9,10] to the nanoscale domain. However, in contrast to diffractionlimited systems, where the group velocity is controlled solely by material dispersion, the energy propagation in nano-waveguides is also strongly affected by the waveguide geometry. We demonstrate that interplay between geometry-and material-controlled modal dispersion in tapered waveguides leads to the transition between photonic compressor regime, where the reduction of phase velocity is accompanied by the simultaneous reduction of group velocity [11,12] and photonic funnel [13] regime where the product of phase and group velocities remains constant [1]. The developed formalism is illustrated on the examples of two fundamentally different nanowaveguides: a surface-mode-based plasmonic nanorod, and a volume-mode fiber with anisotropic core. Applications include nanosized tunable delay lines, all-optical buffers and data synchronizers.The geometry of a typical waveguide structure is schematical...

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Super Mode Propagation in Low Index Medium

Cited by 32 publications

References 3 publications

Highly Directive Hybrid Plasmonic Leaky Wave Optical Nano-Antenna

Highly Directive Hybrid Plasmonic Leaky Wave Optical Nano-Antenna

Compact low loss and broadband hybrid plasmonic directional coupler

Gain-Assisted Slow to Superluminal Group Velocity Manipulation in Nanowaveguides

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