Efficient adiabatic silicon-on-insulator waveguide taper

Fu, Y.; Ye, Tong; Tang, Weijie; Chu, Tao

doi:10.1364/prj.2.000a41

Cited by 161 publications

(105 citation statements)

References 13 publications

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“…The adiabaticity was determined by computing a number of modes accepted at the end width of the waveguide and analysing the power distribution among them according to a taper length L. The taper profile can assume different shapes, e.g., linear, exponential or Gaussian. A linear shape was chosen based on published literature [23] pointing towards a better efficiency compared to the Gaussian and exponential shapes and better stability compared to the parabolic shapes. Convergence tests were performed for the considered number of modes.…”

Section: Adiabatic Taper Lengthmentioning

confidence: 99%

Silicon nitride waveguide platform for fluorescence microscopy of living cells

Tinguely¹,

Helle²,

Ahluwalia³

2017

Opt. Express

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Waveguide chip-based microscopy reduces the complexity of total internal reflection fluorescence (TIRF) microscopy, and adds features like large field of view illumination, decoupling of illumination and collection path and easy multimodal imaging. However, for the technique to become widespread there is a need of low-loss and affordable waveguides made of high-refractive index material. Here, we develop and report a low-loss silicon nitride (Si 3 N 4 ) waveguide platform for multi-color TIRF microscopy. Single mode conditions at visible wavelengths (488-660 nm) were achieved using shallow rib geometry. To generate uniform excitation over appropriate dimensions waveguide bends were used to filter-out higher modes followed by adiabatic tapering. Si 3 N 4 material is finally shown to be biocompatible for growing and imaging living cells.

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Section: Adiabatic Taper Lengthmentioning

confidence: 99%

Silicon nitride waveguide platform for fluorescence microscopy of living cells

Tinguely¹,

Helle²,

Ahluwalia³

2017

Opt. Express

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“…As a result of this linear behaviour, tapers used for a direct expansion almost exclusively use a linear tapering shape, other shapes have been considered showing only marginal improvements. [14] Furthermore, from the evaluated mode profiles ( and 1(d); FULL) it can be seen that the amount of power located in the corner regions of the waveguide is negligible. This allows the use of the effective medium theory (EMT), which separates the field of the guided mode into Cartesian coordinates: ψ = ψ x ψ y .…”

Section: Introductionmentioning

confidence: 91%

Ideal, constant-loss nanophotonic mode converter using a Lagrangian approach

et al. 2016

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1364/OE.24.006680Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Ideal, constant-loss nanophotonic mode converter using a Lagrangian approach Horth, Alexandre; Cheben, Pavel; Schmid, Jens H.; Kashyap, Raman; Quitoriano, Nathaniel J. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=7b0d052f-dcd0-49c8-a1b7-f62f9bae926a http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=7b0d052f-dcd0-49c8-a1b7-f62f9bae926aIdeal, constant-loss nanophotonic mode converter using a Lagrangian approach Abstract:Coupling light between an optical fiber and a silicon nanophotonic waveguide is a challenge facing the field of silicon photonics to which various mode converters have been proposed. Inverted tapers stand out as a practical solution enabling efficient and broadband mode conversion. Current design approaches often use linearly-shaped tapers and two dimensional approximations; however, these approaches have not been rigorously verified and there is not an overarching design framework to guide the design process. Here, using a Lagrangian formulation, we propose an original, constant-loss framework for designing shape-controlled photonic devices and apply this formalism to derive an ideal constant-loss taper (CLT). We specifically report on the experimental demonstration of a fabrication-tolerant, 15-µm-long CLT coupler, that produces 0.56 dB fiber-chip coupling efficiency, the highest efficiency-per-length ratio ever reported.

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“…Several designs of linear grating-based adiabatic tapers involving linear [39], exponential [40] and parabolic [41] profiles have shown. However, there is a tradeoff between the taper length and coupling efficiency due to the adiabatic transition [42]. A complex non-adiabatic taper 15.4 µm long using multimode interference (efficiency 70%) [43] and lens-assisted focusing tapers with lengths varying from 10 to 20 µm with a loss of about -1 dB for TE and -5 dB for TM mode [44] have been demonstrated.…”

Section: Linear Grating Based Compact Tapersmentioning

confidence: 99%

Grating-Assisted Fiber to Chip Coupling for SOI Photonic Circuits

2018

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Fiber to chip coupling is a critical aspect of any integrated photonic circuit. In terms of ease of fabrication as well as wafer-scale testability, surface grating couplers are by far the most preferred scheme of the coupling to integrated circuits. In the past decade, considerable effort has been made for designing efficient grating couplers on Silicon-on-Insulator (SOI) and other allied photonic platforms. Highly efficient grating couplers with sub-dB coupling performance have now been demonstrated. In this article, we review the recent advances made to develop grating coupler designs for a variety of applications on SOI platform. We begin with a basic overview of design methodology involving both shallow etched gratings and the emerging field of subwavelength gratings. The feasibility of reducing footprint by way of incorporating compact tapers is also explored. We also discuss novel grating designs like polarization diversity as well as dual band couplers. Lastly, a brief description of various packaging and wafer-scale testing schemes available for fiber-chip couplers is elaborated.

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Efficient adiabatic silicon-on-insulator waveguide taper

Cited by 161 publications

References 13 publications

Silicon nitride waveguide platform for fluorescence microscopy of living cells

Silicon nitride waveguide platform for fluorescence microscopy of living cells

Ideal, constant-loss nanophotonic mode converter using a Lagrangian approach

Grating-Assisted Fiber to Chip Coupling for SOI Photonic Circuits

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