Super mode propagation in low index medium

Alam, Mahtab; Meier,; Aitchison,; Mojahedi,

doi:10.1109/qels.2007.4431055

Cited by 54 publications

(46 citation statements)

References 4 publications

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“…While gain media can be incorporated for loss compensation, this approach has seen limited success due to the high current densities required (24). Another approach is to form hybrid plasmonic waveguide (HPW), where the coupling between the SPP and TIR modes leads to smaller field overlap at the metal region (25,26). More recently, coupled HPWs have been proposed, which further reduces the field overlap via destructive interference (27)(28)(29).…”

Section: Introductionmentioning

confidence: 99%

Record Purcell factors in ultracompact hybrid plasmonic ring resonators

Chang

Lin

et al. 2019

Sci. Adv.

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For integrated optical devices and traveling-wave resonators, realistic use of the superior wave-matter interaction offered by plasmonics is impeded by ohmic loss, which increases rapidly with mode volume reduction. In this work, we report composite hybrid plasmonic waveguides (CHPWs) that are not only capable of guiding subwavelength optical mode with long-range propagation but also unrestricted by stringent requirements in structural, material, or modal symmetry. In these asymmetric CHPWs, the versatility afforded by coupling dissimilar plasmonic modes provides improved fabrication tolerance and more degrees of device design optimization. Experimental realization of CHPWs demonstrates propagation loss and mode area of 0.03 dB/μm and 0.002 μm2, corresponding to the smallest combination among long-range plasmonic structures reported to date. CHPW ring resonators with 2.5-μm radius were realized with record Purcell factor compared with existing plasmonic and dielectric resonators of similar radii.

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Section: Introductionmentioning

confidence: 99%

Record Purcell factors in ultracompact hybrid plasmonic ring resonators

Chang

Lin

et al. 2019

Sci. Adv.

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“…We now turn our attention to hybrid plasmonic waveguides (HPWs), which has seen widespread applications in optical waveguides and devices [26]. HPWs are formed by having a low-index dielectric layer sandwiched in between a metal layer and another high-index dielectric layer, which is usually a semiconductor like silicon [27,28]. The popularity of the HPW lies not only in its characteristic balance between low-loss and high confinement waveguiding, but also in its flexibility and compatibility for electrical, photonic and plasmonic integration [29].…”

mentioning

confidence: 99%

Waveguide engineering of graphene's nonlinearity

2014

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Graphene has recently been shown to possess giant nonlinearity, however, the utility of this nonlinearity is limited due to high losses and small interaction volume. We show that by performing waveguide engineering to graphene's nonlinearity, we are able to dramatically increase the nonlinear parameter and decrease the switching optical power to sub-watt levels. Our design makes use of the hybrid plasmonic waveguide and careful manipulation of graphene's refractive index by tuning its Fermi level. The ability to tailor the nonlinear parameter in graphene based waveguides via the Fermi level provides a paradigm of nonlinear optics devices to be realized.Graphene is a single sheet of carbon atoms with a honey-comb lattice structure, a naturally-occurring 2D material which has risen to popularity in many areas of research and technology [1]. In the field of photonics, graphene has enjoyed widespread research attention in various optical devices like photodetectors [2,3], modulators and switches [4][5][6], optical logic gates [7], and lasers [8,9]. Some of the strengths of graphene manifest in its unique optical properties, the most common include its large tunable refractive index, high confinement factor, and a universal absorption of 0.3% [10].Of graphene's many unique optical properties, one of them is the giant nonlinearity which has been measured by several groups [11][12][13]. However, there are limitations to the utility of graphene's nonlinearity due to graphene's high losses and small interaction volume, as was pointed out by Khurgin in a recent letter [14]. In his analysis, using a normal-incidence configuration, graphene's nonlinear index n2 could reach as high as 10 -8 m 2 /W, but over 1000 layers are required to perform a π-phase shift; otherwise, a dielectric waveguide configuration could be used but with a drastically lowered effective n2 of 10 -17 m 2 /W. While Khurgin's analysis is valid to a certain extent, there is an omission to analyze graphene's nonlinear performance when incorporated into more sophisticated waveguide structures. In this Letter, we attempt a more rigorous theoretical analysis of several dielectric and plasmonic-based waveguide structure that could enhance the performance of graphene's nonlinear performance. We will base our analysis on the telecommunications wavelength of 1550nm, and consider only waveguide structures that are practical to fabricate. Further, the ability to tune graphene's Fermi level either through chemical doping or electric gating has led to new approaches for achieving broadband optical modulators [15,16]and polarizers [17,18]. This unique characteristic also has the potential to be applied to nonlinear optics applications. We show in this letter that waveguide structures integrated with graphene have nonlinear parameters which depend strongly on graphene's Fermi level. This ability to tune the nonlinear properties of a graphene based waveguide via electric gating or chemical doping could enable a paradigm of nonlinear optics applications to be r...

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“…Silicon-hybrid plasmonic optical interconnects is another rapidly evolving technology. Due to the reduction of mode size much below the diffraction limit, extremely compact devices (sub-100nm dimensions) can be realized [209][210][211][212][213]. Several passive and active components have been proposed and demonstrated, including power splitters [214,215] and polarization splitters/converters [216][217][218][219][220][221], microring resonators [222][223][224][225], modulators [226][227][228][229][230][231], switch [232].…”

Section: Complementary Technologies On Silicon Platformmentioning

confidence: 99%

Recent advances in silicon-based passive and active optical interconnects

Subbaraman¹,

Xu²,

Hosseini³

et al. 2015

Opt. Express

249

121

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Silicon photonics has experienced phenomenal transformations over the last decade. In this paper, we present some of the notable advances in silicon-based passive and active optical interconnect components, and highlight some of our key contributions. Light is also cast on few other parallel technologies that are working in tandem with silicon-based structures, and providing unique functions not achievable with any single system acting alone. With an increasing utilization of CMOS foundries for silicon photonics fabrication, a viable path for realizing extremely low-cost integrated optoelectronics has been paved. These advances are expected to benefit several application domains in the years to come, including communication networks, sensing, and nonlinear systems.

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Super mode propagation in low index medium

Cited by 54 publications

References 4 publications

Record Purcell factors in ultracompact hybrid plasmonic ring resonators

Record Purcell factors in ultracompact hybrid plasmonic ring resonators

Waveguide engineering of graphene's nonlinearity

Recent advances in silicon-based passive and active optical interconnects

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