Non-invasive terahertz field imaging inside parallel plate waveguides

Iwaszczuk, Krzysztof; Andryieuski, Andrei; Lavrinenko, Andrei V.; Zhang, Xicheng; Jepsen, Peter Uhd

doi:10.1063/1.3628340

Cited by 14 publications

(8 citation statements)

References 14 publications

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“…Similar to the previous case (with uniformly spaced plates), the reflection coefficient is found to increase as the output plate spacing is decreased (for a given frequency) and also when the frequency is decreased (for a given output plate separation). This latter dependence has also been observed in a finite-width tapered PPWG very recently, 19 using an air-photonic field imaging technique. It should be noted that, in our data analysis, we are assuming that the forward propagating wave is not affected by the placement of the mirror in deriving the incident (reference) signal.…”

Section: A)supporting

confidence: 62%

Study of the impedance mismatch at the output end of a THz parallel-plate waveguide

Mbonye

Mendis

Mittleman

2012

Applied Physics Letters

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We study the reflection of terahertz (THz) radiation at the end of a parallel-plate waveguide (PPWG), due to the impedance mismatch between the propagating transverse-electromagnetic mode and the free-space background. We find that, for a PPWG with uniformly spaced plates, the reflection coefficient at the output face increases as the plate separation decreases, consistent with predictions by early low frequency ray optical theory. We also study the reflection coefficient for tapered PPWGs where the plate spacing is tapered, for which no analytical theory exists, and quantify the reflection coefficient as a function of the plate separation and the THz frequency.

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Section: A)supporting

confidence: 62%

Study of the impedance mismatch at the output end of a THz parallel-plate waveguide

Mbonye

Mendis

Mittleman

2012

Applied Physics Letters

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“…For optical indices in the vicinity of n WG = 2.6, the incidence angle should thus be approximately 238. At normal incidence of the THz field, significant temporal smearing will occur even for interaction lengths of a few tens of micrometers, thus severely limiting the bandwidth and effectiveness of the device [42].…”

Section: Temporal Dynamicsmentioning

confidence: 99%

Optimization design of optical waveguide control by nanoslit-enhanced THz field

Novitsky¹,

Malureanu²,

Zalkovskij³

et al. 2013

Photonics and Nanostructures - Fundamentals and Applications

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We discuss design issues of devices which were proposed recently [Opt. Lett. 37 (2012) 3903] for terahertz (THz) control of the propagation of an optical waveguide mode. The mode propagates through a nonlinear dielectric material placed in a metallic nanoslit illuminated by THz radiation. The THz field in the slit is strongly localized and thus significantly enhanced, facilitating nonlinear interactions with the dielectric waveguide material. This enhancement can lead to notable changes in the refractive index of the waveguide. The closer the waveguide is to the slit walls, the higher the nonlinear effects are, but with the cost of increasing propagation losses due to parasitic coupling to surface plasmon polaritons at the metal interfaces. We analyze several optical waveguide configurations and define a figure of merit that allows us to design the optimal configuration. We find that designs with less overlap of the THz and optical fields but also with lower losses are better than designs where both these parameters are higher. The estimated terahertz field incident onto the metallic nanoslit required to manipulate the waveguide mode has reasonable values which can be achieved in practice.

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“…Being based on metals, they not only provide better confinement, leading to extremely high field concentration of optical and THz radiation [3][4][5], but also allow electro-optical propagation tuning by applying voltage or driving electrical current. One of the most popular plasmonic waveguide in the infrared range is the slot waveguide [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Improving plasmonic waveguides coupling efficiency using nanoantennas

Andryieuski

Malureanu

Bouillard

et al. 2012

2012 14th International Conference on Transparent Optical Networks (ICTON)

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Plasmonic waveguides bear a lot of potential for photonic applications. However, one of the challenges for implementing them in devices is the low coupling efficiency to and from optical fibers. We report on our approach to facilitate the coupling efficiency with the use of metallic nanoantennas. The classical dipole antenna scheme can be improved by changing the nanoantenna geometry, adding constructive elements such as reflecting bars and mirrors and using arrays of antennas. The modelling designates that the coupling efficiency from a vertical fiber to a plasmonic waveguide can be improved more than in 180 times in comparison with a direct fiber-waveguide coupling. Pros and cons of each configuration are discussed. Fabrication and characterisation results are reported.

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Non-invasive terahertz field imaging inside parallel plate waveguides

Cited by 14 publications

References 14 publications

Study of the impedance mismatch at the output end of a THz parallel-plate waveguide

Study of the impedance mismatch at the output end of a THz parallel-plate waveguide

Optimization design of optical waveguide control by nanoslit-enhanced THz field

Improving plasmonic waveguides coupling efficiency using nanoantennas

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