Propagation loss computation of W1 photonic crystal waveguides using the cutback technique with the 3D-FDTD method

Kappeler, Roman; Kaspar, Peter; Jäckel, H.

doi:10.1016/j.photonics.2011.03.002

Cited by 8 publications

(7 citation statements)

References 29 publications

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“…2 the significance of the dispersion curves for the propagation losses is confirmed by the numerically computed propagation loss spectrum. The propagation losses are obtained by applying the cutback-method to numerically computed transmission spectra of five different lengths of PhC waveguides L i = 10a, 20a, 30a, 40a, 50a [6]. The accurate computation of the transmission curves with 3D FDTD requires a realistic excitation through a trench waveguide and a fine mesh resolution of 20 grid points per period a.…”

Section: Theoretical Foundations For Low Propagation Lossesmentioning

confidence: 99%

“…The vertical layer structure allows a straightforward realization of a PIN diode that could be contacted similarly to conventional semiconductor lasers and amplifiers characterized by an efficient vertical current injection [1][2][3][4]. However, research on systems with weak contrast of refractive index -also known as substrate-type PhC devices -has been dropped by most research groups due to the currently high propagation losses of single mode PhC waveguides in the order of 600 − 1000 dB/cm [5,6]. On the other hand, membrane-type PhC waveguides exhibit low propagation losses below 10 dB/cm [7][8][9][10] but for active membrane-type PhC devices, the current has to be pumped laterally through the PhC [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…The thick black curve is the corresponding propagation loss α dB . The white (bright blue) background signifies reliable (unreliable) propagation losses according to[6].…”

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confidence: 99%

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Design proposal for a low loss in-plane active photonic crystal waveguide with vertical electrical carrier injection

et al. 2012

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We propose an active waveguide design that provides both low propagation losses (< 20 dB/cm) and the capability for electrical pumping of the photonic crystal waveguide with a vertical contacting scheme. A careful estimation of a large number of parameters is required in order to obtain both properties. The proposed device supports single mode operation at the telecom wavelength λ = 1550 nm and is suitable for the implementation of in-plane active photonic crystal devices, such as semiconductor optical amplifiers and lasers.

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Section: Theoretical Foundations For Low Propagation Lossesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design proposal for a low loss in-plane active photonic crystal waveguide with vertical electrical carrier injection

et al. 2012

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“…Single-mode line-defect PhC waveguides are obtained by deeply etching holes into such a layer stack. These PhC waveguides suffer from large propagation losses in the order of 600 -1000 dB/cm [4,5]. Recent progress [6] showed that the angled-sidewall of the conical/cylindro-conical hole shape is responsible for the large propagation losses in these singlemode PhC waveguides.…”

mentioning

confidence: 99%

“…Since we now have the means to perform the optimisation more rigorously with our cutback-method based on 3D FDTD computations [5], we re-perform the optimisation task for W1 PhC waveguides with a hole shape approximated by a 500 nm-deep cylindrical hole followed by a conical hole of depth d cone = 3.3mm. This is a typical hole shape obtained experimentally in our as well as in other labs.…”

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confidence: 99%

Minimisation of out-of-plane losses in slab photonic crystals by optimising vertical heterostructure

et al. 2012

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Planar line-defect photonic crystal waveguides with a weak vertical refractive index contrast (substrate-type) suffer from large propagation losses in the order of 600 -1000 dB/cm. A possibility to reduce propagation losses is to optimise the vertical layer stack for a given hole shape. This strategy is pursued to reduce the propagation losses numerically and experimentally. It is demonstrated that the loss figure can vary by a factor of about 2 for relatively small changes in the core layer thickness.

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Tuneable Sum-Frequency Generation and Spectral Broadening Based on Proton-Exchanged Thin-Film Lithium Niobate Ridge Waveguide

Yan,

Huang,

Wang

et al. 2024

ACS Photonics

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How to simultaneously generate sum-frequency (SF) generation (SFG) and achieve spectral broadening has always been a research focus in spectral measurement and optical imaging. In this study, we have achieved SFG and spectral broadening for the first time in a proton-exchanged thin-film lithium niobate ridge waveguide. By adjusting the wavelength of the continuous laser, we could dynamically tune the center wavelength of the SF light and the width of the spectral broadening. Wherein the highest normalized conversion efficiency of harmonic light was 1048.1% W1– cm–2, the normalized conversion efficiency of SF light was 345.9% W1– cm–2, while we achieved a tuning width of up to 80 nm for the SF light. Additionally, tuneable spectral broadening can be effectively achieved by designing an effective waveguide dispersion and utilizing self-phase and cross-phase modulation between photons, with a broadening range of up to 84–107 nm, and bidirectional modulation can be achieved. The successful implementation of this work opens up new possibilities for on-chip spectral detection, on-chip imaging, and a tuneable broadband light source, providing novel insights into the field.

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Propagation loss computation of W1 photonic crystal waveguides using the cutback technique with the 3D-FDTD method

Cited by 8 publications

References 29 publications

Design proposal for a low loss in-plane active photonic crystal waveguide with vertical electrical carrier injection

Design proposal for a low loss in-plane active photonic crystal waveguide with vertical electrical carrier injection

Minimisation of out-of-plane losses in slab photonic crystals by optimising vertical heterostructure

Tuneable Sum-Frequency Generation and Spectral Broadening Based on Proton-Exchanged Thin-Film Lithium Niobate Ridge Waveguide

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