Efficient light coupling into a photonic crystal waveguide with flatband slow mode

A. Säynätjoki (Corresponding Author), K. Vynck, M. Mulot, D. Cassagne, Jouni Ahopelto, H. Lipsanen

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

We design an efficient coupler to transmit light from a strip waveguide into the flatband slow mode of a photonic crystal waveguide with ring-shaped holes. The coupler is a section of a photonic crystal waveguide with a higher group velocity, obtained by different ring dimensions. We demonstrate coupling efficiency in excess of 95% over the 8 nm wavelength range where the photonic crystal waveguide exhibits a quasi-constant group velocity vgc/37 and observe a more than 12-fold intensity enhancement in the slow-light waveguide. An analysis based on the small Fabry–Pérot resonances in the simulated transmission spectra is used for studying the effect of the coupler length and for evaluating the coupling efficiency in different parts of the coupler. The mode conversion efficiency within the coupler is more than 99.7% over the wavelength range of interest. The parasitic reflectance in the coupler, which depends on the propagation constant mismatch between the slow mode and the coupler mode, is lower than 0.6%.
Original languageEnglish
Pages (from-to)127 - 133
Number of pages7
JournalPhotonics and Nanostructures: Fundamentals and Applications
Volume6
Issue number2
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

Photonic crystals
couplers
Waveguides
photonics
waveguides
crystals
Slow light
Wavelength
group velocity
Optical waveguides
Conversion efficiency
rings
wavelengths
strip
reflectance
propagation
augmentation

Keywords

  • Guided waves
  • Integrated optics materials
  • Optical systems design
  • Waveguide
  • Photonic integrated circuits
  • Dispersion
  • Photonic crystal

Cite this

Säynätjoki, A. ; Vynck, K. ; Mulot, M. ; Cassagne, D. ; Ahopelto, Jouni ; Lipsanen, H. / Efficient light coupling into a photonic crystal waveguide with flatband slow mode. In: Photonics and Nanostructures: Fundamentals and Applications. 2008 ; Vol. 6, No. 2. pp. 127 - 133.
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title = "Efficient light coupling into a photonic crystal waveguide with flatband slow mode",
abstract = "We design an efficient coupler to transmit light from a strip waveguide into the flatband slow mode of a photonic crystal waveguide with ring-shaped holes. The coupler is a section of a photonic crystal waveguide with a higher group velocity, obtained by different ring dimensions. We demonstrate coupling efficiency in excess of 95{\%} over the 8 nm wavelength range where the photonic crystal waveguide exhibits a quasi-constant group velocity vg ≈ c/37 and observe a more than 12-fold intensity enhancement in the slow-light waveguide. An analysis based on the small Fabry–P{\'e}rot resonances in the simulated transmission spectra is used for studying the effect of the coupler length and for evaluating the coupling efficiency in different parts of the coupler. The mode conversion efficiency within the coupler is more than 99.7{\%} over the wavelength range of interest. The parasitic reflectance in the coupler, which depends on the propagation constant mismatch between the slow mode and the coupler mode, is lower than 0.6{\%}.",
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Efficient light coupling into a photonic crystal waveguide with flatband slow mode. / Säynätjoki, A. (Corresponding Author); Vynck, K.; Mulot, M.; Cassagne, D.; Ahopelto, Jouni; Lipsanen, H.

In: Photonics and Nanostructures: Fundamentals and Applications, Vol. 6, No. 2, 2008, p. 127 - 133.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Efficient light coupling into a photonic crystal waveguide with flatband slow mode

AU - Säynätjoki, A.

AU - Vynck, K.

AU - Mulot, M.

AU - Cassagne, D.

AU - Ahopelto, Jouni

AU - Lipsanen, H.

PY - 2008

Y1 - 2008

N2 - We design an efficient coupler to transmit light from a strip waveguide into the flatband slow mode of a photonic crystal waveguide with ring-shaped holes. The coupler is a section of a photonic crystal waveguide with a higher group velocity, obtained by different ring dimensions. We demonstrate coupling efficiency in excess of 95% over the 8 nm wavelength range where the photonic crystal waveguide exhibits a quasi-constant group velocity vg ≈ c/37 and observe a more than 12-fold intensity enhancement in the slow-light waveguide. An analysis based on the small Fabry–Pérot resonances in the simulated transmission spectra is used for studying the effect of the coupler length and for evaluating the coupling efficiency in different parts of the coupler. The mode conversion efficiency within the coupler is more than 99.7% over the wavelength range of interest. The parasitic reflectance in the coupler, which depends on the propagation constant mismatch between the slow mode and the coupler mode, is lower than 0.6%.

AB - We design an efficient coupler to transmit light from a strip waveguide into the flatband slow mode of a photonic crystal waveguide with ring-shaped holes. The coupler is a section of a photonic crystal waveguide with a higher group velocity, obtained by different ring dimensions. We demonstrate coupling efficiency in excess of 95% over the 8 nm wavelength range where the photonic crystal waveguide exhibits a quasi-constant group velocity vg ≈ c/37 and observe a more than 12-fold intensity enhancement in the slow-light waveguide. An analysis based on the small Fabry–Pérot resonances in the simulated transmission spectra is used for studying the effect of the coupler length and for evaluating the coupling efficiency in different parts of the coupler. The mode conversion efficiency within the coupler is more than 99.7% over the wavelength range of interest. The parasitic reflectance in the coupler, which depends on the propagation constant mismatch between the slow mode and the coupler mode, is lower than 0.6%.

KW - Guided waves

KW - Integrated optics materials

KW - Optical systems design

KW - Waveguide

KW - Photonic integrated circuits

KW - Dispersion

KW - Photonic crystal

U2 - 10.1016/j.photonics.2008.03.001

DO - 10.1016/j.photonics.2008.03.001

M3 - Article

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JO - Photonics and Nanostructures: Fundamentals and Applications

JF - Photonics and Nanostructures: Fundamentals and Applications

SN - 1569-4410

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