Terahertz waveguiding in glass-clad silicon wafers

Sørgård, Trygve; Mølster, Kjell Martin; Laurell, Fredrik; Pašiškevičius, Valdas; Gibson, Ursula J.; Österberg, Ulf L.

doi:10.1364/ome.384226

Cited by 4 publications

(7 citation statements)

References 33 publications

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“…Nyfors ® , Fibrebridge ® ). Tapering stations have been successfully used in the recrystallisation of silicon core fibres 51 , 52 , resulting in high optical quality crystalline cores.…”

Section: History and Backgroundmentioning

confidence: 99%

Semiconductor core fibres: materials science in a bottle

2021

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Novel core fibers have a wide range of applications in optics, as sources, detectors and nonlinear response media. Optoelectronic, and even electronic device applications are now possible, due to the introduction of methods for drawing fibres with a semiconductor core. This review examines progress in the development of glass-clad, crystalline core fibres, with an emphasis on semiconducting cores. The underlying materials science and the importance of post-processing techniques for recrystallization and purification are examined, with achievements and future prospects tied to the phase diagrams of the core materials.

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“…Nyfors ® , Fibrebridge ® ). Tapering stations have been successfully used in the recrystallisation of silicon core fibres 51 , 52 , resulting in high optical quality crystalline cores.…”

Section: History and Backgroundmentioning

confidence: 99%

Semiconductor core fibres: materials science in a bottle

2021

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“…The x-axes show the delay time with respect to the reference pulse and are shifted to facilitate comparison of the pulse shapes. The small thickness of the GaP crystal caused Fabry-Pérot echoes [10] in the time-domain signal. Reflections inside the GaP crystal occur at intervals of ∼ 6 ps, and are clearly observed in all three traces.…”

Section: Resultsmentioning

confidence: 99%

“…Although this first demonstration of guiding in fibers used short, large diameter samples, a fiber tip of this material could be combined with a longer guide lacking biocompatibility. Results on wafers [10] demonstrate that smaller diameters where fiber flexibility is maintained could also be developed.…”

Section: Resultsmentioning

confidence: 99%

“…Terahertz transmission measurements were made with the broadband plasma-based system described in [10], but with the sample placed between the off-axis parabolic mirrors, as shown in Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

“…Malekabadi [8] gives an excellent review of solid core structures, and presents results in the microwave region, discussing the superiority of high purity silicon; it is seen as the best broad transmission window option [7]. Silicon core fibers have been analyzed as potential waveguides [9], and recent experimental studies on planar guides support the validity of this approach [10]. A major challenge for fibers is the preference for a single or near-single crystal core to limit impurity inclusion and scattering losses but most studies on the recrystallization of silicon fibers have been done with smaller core material [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Broadband infrared and THz transmitting silicon core optical fiber

Sørgård

Song

Vullum

et al. 2020

Opt. Mater. Express

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Silicon waveguide structures are a viable alternative for the transmission of signals over a wide range of frequencies, and new fabrication methods are key to increased applications. In this work, THz transparency of silicon-core, silica clad fibers, refined using a traveling solvent method, is demonstrated. The ≈ 200 µm core of these fibers is shown to have good transmission from 4.8-9 µm and 1-7 THz. Fibers were drawn on a conventional optical fiber tower using the scalable molten core technique and CO 2 laser annealed, resulting in large-grain crystalline cores with broadband transmission. The spectral properties are comparable to those of rectangular guides of similar cross-sectional area cut from high resistivity float zone silicon wafers.

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Tunable plasmon-induced transparency and slow light in terahertz chipscale semiconductor plasmonic waveguides

Zhang¹,

Yang²,

He³

et al. 2020

J. Phys. D: Appl. Phys.

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We numerically propose the plasmon-induced transparency (PIT) and slow light effect based on terahertz (THz) chipscale plasmonic semiconductor-insulator-semiconductor (SIS) waveguide system. Via the coupling between two stub resonators, PIT is introduced due to the destructive interference, which can be theoretically described by the transmission-line Method (TLM). Meanwhile, the strong dispersion within the transparent window will lead to the slow light effect. Via tuning the geometric parameters, the profile of PIT as well as group delay line can be arbitrarily tailored. Moreover, active control of both PIT and slow light can be realized by changing the ambient temperature. Especially, by integrating monolayer graphene into the structure, PIT and slow light can also be electrically modulated via applying voltage. This work provides geometrical, thermal and electrical approaches to manipulate THz transmission and group delay in subwavelength scale, and can find potential applications as filters, sensors, modulators and active optical delay lines in THz ultracompact circuits.

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Terahertz waveguiding in glass-clad silicon wafers

Cited by 4 publications

References 33 publications

Semiconductor core fibres: materials science in a bottle

Semiconductor core fibres: materials science in a bottle

Broadband infrared and THz transmitting silicon core optical fiber

Tunable plasmon-induced transparency and slow light in terahertz chipscale semiconductor plasmonic waveguides

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