Abstract

An asymmetric directional coupler scheme for the efficient injection of light into slow light slot photonic crystal waveguide modes is proposed and investigated using finite-difference time-domain simulation. Coupling wavelengths can be flexibly controlled by the geometrical parameters of a side-coupled subwavelength corrugated strip waveguide. This approach leads to a ~1dB insertion loss level up to moderately high light group indices (nG≈30) in wavelength ranges of 5-10nm. This work brings new opportunities to inject light into the slow modes of slot photonic crystal waveguides for on-chip communications using hybrid silicon photonics or sensing based on hollow core waveguides.

© 2014 Optical Society of America

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References

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  1. R. Soref, “The past, present, and future of silicon photonics,” Selected Topics in Quantum Electronics, IEEE Journal of 12(6), 1678–1687 (2006).
    [CrossRef]
  2. L. Vivien and L. Pavesi, Handbook of Silicon Photonics (Taylor & Francis, 2013).
  3. V. R. Almeida, Q. Xu, C. A. Barrios, M. Lipson, “Guiding and confining light in void nanostructure,” Opt. Lett. 29(11), 1209–1211 (2004).
    [CrossRef] [PubMed]
  4. T. Liu, R. Panepucci, “Confined waveguide modes in slot photonic crystal slab,” Opt. Express 15(7), 4304–4309 (2007).
    [CrossRef] [PubMed]
  5. A. Di Falco, L. O’Faolain, T. F. Krauss, “Photonic crystal slotted slab waveguides,” Photonics Nanostruct. Fundam. Appl. 6(1), 38–41 (2008).
    [CrossRef]
  6. A. Di Falco, L. OFaolain, T. F. Krauss, “Dispersion control and slow light in slotted photonic crystal waveguides,” Appl. Phys. Lett. 92(8), 083501 (2008).
    [CrossRef]
  7. J. Gao, J. F. McMillan, M.-C. Wu, J. Zheng, S. Assefa, C. W. Wong, “Demonstration of an air-slot mode-gap confined photonic crystal slab nanocavity with ultrasmall mode volumes,” Appl. Phys. Lett. 96(5), 051123 (2010).
    [CrossRef]
  8. C. Caer, X. Le Roux, E. Cassan, “Enhanced localization of light in slow wave slot photonic crystal waveguides,” Opt. Lett. 37(17), 3660–3662 (2012).
    [CrossRef] [PubMed]
  9. J.-M. Brosi, C. Koos, L. C. Andreani, M. Waldow, J. Leuthold, W. Freude, “High-speed low-voltage electro-optic modulator with a polymer-infiltrated silicon photonic crystal waveguide,” Opt. Express 16(6), 4177–4191 (2008).
    [CrossRef] [PubMed]
  10. J. H. Wülbern, A. Petrov, M. Eich, “Electro-optical modulator in a polymerinfiltrated silicon slotted photonic crystal waveguide heterostructure resonator,” Opt. Express 17(1), 304–313 (2009).
    [CrossRef] [PubMed]
  11. C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
    [CrossRef]
  12. J. P. Hugonin, P. Lalanne, T. P. White, T. F. Krauss, “Coupling into slow-mode photonic crystal waveguides,” Opt. Lett. 32(18), 2638–2640 (2007).
    [CrossRef] [PubMed]
  13. C. Martijn de Sterke, K. B. Dossou, T. P. White, L. C. Botten, R. C. McPhedran, “Efficient coupling into slow light photonic crystal waveguide without transition region: role of evanescent modes,” Opt. Express 17(20), 17338–17343 (2009).
    [CrossRef] [PubMed]
  14. X. Chen, W. Jiang, J. Chen, L. Gu, R. T. Chen, “20 dB-enhanced coupling to slot photonic crystal waveguide using multimode interference coupler,” Appl. Phys. Lett. 91(9), 091111 (2007).
    [CrossRef]
  15. C.-Y. Lin, A. X. Wang, W.-C. Lai, J. L. Covey, S. Chakravarty, R. T. Chen, “Coupling loss minimization of slow light slotted photonic crystal waveguides using mode matching with continuous group index perturbation,” Opt. Lett. 37(2), 232–234 (2012).
    [CrossRef] [PubMed]
  16. M. G. Scullion, T. F. Krauss, A. Di Falco, “High efficiency interface for coupling into slotted photonic crystal waveguides,” Photonics Journal, IEEE 3(2), 203–208 (2011).
    [CrossRef]
  17. K. Muhieddine, A. Lupu, E. Cassan, J.-M. Lourtioz, “Proposal and analysis of narrow band transmission asymmetric directional couplers with Bragg grating induced phase matching,” Opt. Express 18(22), 23183–23195 (2010).
    [CrossRef] [PubMed]
  18. A. Lupu, K. Muhieddine, E. Cassan, J.-M. Lourtioz, “Dual transmission band Bragg grating assisted asymmetric directional couplers,” Opt. Express 19(2), 1246–1259 (2011).
    [CrossRef] [PubMed]
  19. S. Johnson, J. Joannopoulos, “Block-iterative frequency-domain methods for Maxwell’s equations in a planewave basis,” Opt. Express 8(3), 173–190 (2001).
    [CrossRef] [PubMed]
  20. A. Farjadpour, D. Roundy, A. Rodriguez, M. Ibanescu, P. Bermel, J. D. Joannopoulos, S. G. Johnson, G. W. Burr, “Improving accuracy by subpixel smoothing in the finite-difference time domain,” Opt. Lett. 31(20), 2972–2974 (2006).
    [CrossRef] [PubMed]
  21. P. J. Bock, P. Cheben, J. H. Schmid, J. Lapointe, A. Delâge, S. Janz, G. C. Aers, D.-X. Xu, A. Densmore, T. J. Hall, “Subwavelength grating periodic structures in silicon-on-insulator: a new type of microphotonic waveguide,” Opt. Express 18(19), 20251–20262 (2010).
    [CrossRef] [PubMed]

2012 (2)

2011 (2)

M. G. Scullion, T. F. Krauss, A. Di Falco, “High efficiency interface for coupling into slotted photonic crystal waveguides,” Photonics Journal, IEEE 3(2), 203–208 (2011).
[CrossRef]

A. Lupu, K. Muhieddine, E. Cassan, J.-M. Lourtioz, “Dual transmission band Bragg grating assisted asymmetric directional couplers,” Opt. Express 19(2), 1246–1259 (2011).
[CrossRef] [PubMed]

2010 (3)

2009 (3)

2008 (3)

J.-M. Brosi, C. Koos, L. C. Andreani, M. Waldow, J. Leuthold, W. Freude, “High-speed low-voltage electro-optic modulator with a polymer-infiltrated silicon photonic crystal waveguide,” Opt. Express 16(6), 4177–4191 (2008).
[CrossRef] [PubMed]

A. Di Falco, L. O’Faolain, T. F. Krauss, “Photonic crystal slotted slab waveguides,” Photonics Nanostruct. Fundam. Appl. 6(1), 38–41 (2008).
[CrossRef]

A. Di Falco, L. OFaolain, T. F. Krauss, “Dispersion control and slow light in slotted photonic crystal waveguides,” Appl. Phys. Lett. 92(8), 083501 (2008).
[CrossRef]

2007 (3)

2006 (2)

2004 (1)

2001 (1)

Aers, G. C.

Almeida, V. R.

Andreani, L. C.

Assefa, S.

J. Gao, J. F. McMillan, M.-C. Wu, J. Zheng, S. Assefa, C. W. Wong, “Demonstration of an air-slot mode-gap confined photonic crystal slab nanocavity with ultrasmall mode volumes,” Appl. Phys. Lett. 96(5), 051123 (2010).
[CrossRef]

Baets, R.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

Barrios, C. A.

Bermel, P.

Biaggio, I.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

Bock, P. J.

Bogaerts, W.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

Botten, L. C.

Brosi, J.-M.

Burr, G. W.

Caer, C.

Cassan, E.

Chakravarty, S.

Cheben, P.

Chen, J.

X. Chen, W. Jiang, J. Chen, L. Gu, R. T. Chen, “20 dB-enhanced coupling to slot photonic crystal waveguide using multimode interference coupler,” Appl. Phys. Lett. 91(9), 091111 (2007).
[CrossRef]

Chen, R. T.

C.-Y. Lin, A. X. Wang, W.-C. Lai, J. L. Covey, S. Chakravarty, R. T. Chen, “Coupling loss minimization of slow light slotted photonic crystal waveguides using mode matching with continuous group index perturbation,” Opt. Lett. 37(2), 232–234 (2012).
[CrossRef] [PubMed]

X. Chen, W. Jiang, J. Chen, L. Gu, R. T. Chen, “20 dB-enhanced coupling to slot photonic crystal waveguide using multimode interference coupler,” Appl. Phys. Lett. 91(9), 091111 (2007).
[CrossRef]

Chen, X.

X. Chen, W. Jiang, J. Chen, L. Gu, R. T. Chen, “20 dB-enhanced coupling to slot photonic crystal waveguide using multimode interference coupler,” Appl. Phys. Lett. 91(9), 091111 (2007).
[CrossRef]

Covey, J. L.

Delâge, A.

Densmore, A.

Di Falco, A.

M. G. Scullion, T. F. Krauss, A. Di Falco, “High efficiency interface for coupling into slotted photonic crystal waveguides,” Photonics Journal, IEEE 3(2), 203–208 (2011).
[CrossRef]

A. Di Falco, L. O’Faolain, T. F. Krauss, “Photonic crystal slotted slab waveguides,” Photonics Nanostruct. Fundam. Appl. 6(1), 38–41 (2008).
[CrossRef]

A. Di Falco, L. OFaolain, T. F. Krauss, “Dispersion control and slow light in slotted photonic crystal waveguides,” Appl. Phys. Lett. 92(8), 083501 (2008).
[CrossRef]

Diederich, F.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

Dossou, K. B.

Dumon, P.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

Eich, M.

Esembeson, B.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

Farjadpour, A.

Freude, W.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

J.-M. Brosi, C. Koos, L. C. Andreani, M. Waldow, J. Leuthold, W. Freude, “High-speed low-voltage electro-optic modulator with a polymer-infiltrated silicon photonic crystal waveguide,” Opt. Express 16(6), 4177–4191 (2008).
[CrossRef] [PubMed]

Gao, J.

J. Gao, J. F. McMillan, M.-C. Wu, J. Zheng, S. Assefa, C. W. Wong, “Demonstration of an air-slot mode-gap confined photonic crystal slab nanocavity with ultrasmall mode volumes,” Appl. Phys. Lett. 96(5), 051123 (2010).
[CrossRef]

Gu, L.

X. Chen, W. Jiang, J. Chen, L. Gu, R. T. Chen, “20 dB-enhanced coupling to slot photonic crystal waveguide using multimode interference coupler,” Appl. Phys. Lett. 91(9), 091111 (2007).
[CrossRef]

Hall, T. J.

Hugonin, J. P.

Ibanescu, M.

Janz, S.

Jiang, W.

X. Chen, W. Jiang, J. Chen, L. Gu, R. T. Chen, “20 dB-enhanced coupling to slot photonic crystal waveguide using multimode interference coupler,” Appl. Phys. Lett. 91(9), 091111 (2007).
[CrossRef]

Joannopoulos, J.

Joannopoulos, J. D.

Johnson, S.

Johnson, S. G.

Koos, C.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

J.-M. Brosi, C. Koos, L. C. Andreani, M. Waldow, J. Leuthold, W. Freude, “High-speed low-voltage electro-optic modulator with a polymer-infiltrated silicon photonic crystal waveguide,” Opt. Express 16(6), 4177–4191 (2008).
[CrossRef] [PubMed]

Krauss, T. F.

M. G. Scullion, T. F. Krauss, A. Di Falco, “High efficiency interface for coupling into slotted photonic crystal waveguides,” Photonics Journal, IEEE 3(2), 203–208 (2011).
[CrossRef]

A. Di Falco, L. OFaolain, T. F. Krauss, “Dispersion control and slow light in slotted photonic crystal waveguides,” Appl. Phys. Lett. 92(8), 083501 (2008).
[CrossRef]

A. Di Falco, L. O’Faolain, T. F. Krauss, “Photonic crystal slotted slab waveguides,” Photonics Nanostruct. Fundam. Appl. 6(1), 38–41 (2008).
[CrossRef]

J. P. Hugonin, P. Lalanne, T. P. White, T. F. Krauss, “Coupling into slow-mode photonic crystal waveguides,” Opt. Lett. 32(18), 2638–2640 (2007).
[CrossRef] [PubMed]

Lai, W.-C.

Lalanne, P.

Lapointe, J.

Le Roux, X.

Leuthold, J.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

J.-M. Brosi, C. Koos, L. C. Andreani, M. Waldow, J. Leuthold, W. Freude, “High-speed low-voltage electro-optic modulator with a polymer-infiltrated silicon photonic crystal waveguide,” Opt. Express 16(6), 4177–4191 (2008).
[CrossRef] [PubMed]

Lin, C.-Y.

Lipson, M.

Liu, T.

Lourtioz, J.-M.

Lupu, A.

Martijn de Sterke, C.

McMillan, J. F.

J. Gao, J. F. McMillan, M.-C. Wu, J. Zheng, S. Assefa, C. W. Wong, “Demonstration of an air-slot mode-gap confined photonic crystal slab nanocavity with ultrasmall mode volumes,” Appl. Phys. Lett. 96(5), 051123 (2010).
[CrossRef]

McPhedran, R. C.

Michinobu, T.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

Muhieddine, K.

O’Faolain, L.

A. Di Falco, L. O’Faolain, T. F. Krauss, “Photonic crystal slotted slab waveguides,” Photonics Nanostruct. Fundam. Appl. 6(1), 38–41 (2008).
[CrossRef]

OFaolain, L.

A. Di Falco, L. OFaolain, T. F. Krauss, “Dispersion control and slow light in slotted photonic crystal waveguides,” Appl. Phys. Lett. 92(8), 083501 (2008).
[CrossRef]

Panepucci, R.

Petrov, A.

Rodriguez, A.

Roundy, D.

Schmid, J. H.

Scullion, M. G.

M. G. Scullion, T. F. Krauss, A. Di Falco, “High efficiency interface for coupling into slotted photonic crystal waveguides,” Photonics Journal, IEEE 3(2), 203–208 (2011).
[CrossRef]

Soref, R.

R. Soref, “The past, present, and future of silicon photonics,” Selected Topics in Quantum Electronics, IEEE Journal of 12(6), 1678–1687 (2006).
[CrossRef]

Vallaitis, T.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

Vorreau, P.

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

Waldow, M.

Wang, A. X.

White, T. P.

Wong, C. W.

J. Gao, J. F. McMillan, M.-C. Wu, J. Zheng, S. Assefa, C. W. Wong, “Demonstration of an air-slot mode-gap confined photonic crystal slab nanocavity with ultrasmall mode volumes,” Appl. Phys. Lett. 96(5), 051123 (2010).
[CrossRef]

Wu, M.-C.

J. Gao, J. F. McMillan, M.-C. Wu, J. Zheng, S. Assefa, C. W. Wong, “Demonstration of an air-slot mode-gap confined photonic crystal slab nanocavity with ultrasmall mode volumes,” Appl. Phys. Lett. 96(5), 051123 (2010).
[CrossRef]

Wülbern, J. H.

Xu, D.-X.

Xu, Q.

Zheng, J.

J. Gao, J. F. McMillan, M.-C. Wu, J. Zheng, S. Assefa, C. W. Wong, “Demonstration of an air-slot mode-gap confined photonic crystal slab nanocavity with ultrasmall mode volumes,” Appl. Phys. Lett. 96(5), 051123 (2010).
[CrossRef]

Appl. Phys. Lett. (1)

A. Di Falco, L. OFaolain, T. F. Krauss, “Dispersion control and slow light in slotted photonic crystal waveguides,” Appl. Phys. Lett. 92(8), 083501 (2008).
[CrossRef]

Appl. Phys. Lett. (2)

J. Gao, J. F. McMillan, M.-C. Wu, J. Zheng, S. Assefa, C. W. Wong, “Demonstration of an air-slot mode-gap confined photonic crystal slab nanocavity with ultrasmall mode volumes,” Appl. Phys. Lett. 96(5), 051123 (2010).
[CrossRef]

X. Chen, W. Jiang, J. Chen, L. Gu, R. T. Chen, “20 dB-enhanced coupling to slot photonic crystal waveguide using multimode interference coupler,” Appl. Phys. Lett. 91(9), 091111 (2007).
[CrossRef]

Nat. Photonics (1)

C. Koos, P. Vorreau, T. Vallaitis, P. Dumon, W. Bogaerts, R. Baets, B. Esembeson, I. Biaggio, T. Michinobu, F. Diederich, W. Freude, J. Leuthold, “All-optical high-speed signal processing with silicon-organic hybrid slot waveguides,” Nat. Photonics 3(4), 216–219 (2009).
[CrossRef]

Opt. Express (8)

C. Martijn de Sterke, K. B. Dossou, T. P. White, L. C. Botten, R. C. McPhedran, “Efficient coupling into slow light photonic crystal waveguide without transition region: role of evanescent modes,” Opt. Express 17(20), 17338–17343 (2009).
[CrossRef] [PubMed]

K. Muhieddine, A. Lupu, E. Cassan, J.-M. Lourtioz, “Proposal and analysis of narrow band transmission asymmetric directional couplers with Bragg grating induced phase matching,” Opt. Express 18(22), 23183–23195 (2010).
[CrossRef] [PubMed]

A. Lupu, K. Muhieddine, E. Cassan, J.-M. Lourtioz, “Dual transmission band Bragg grating assisted asymmetric directional couplers,” Opt. Express 19(2), 1246–1259 (2011).
[CrossRef] [PubMed]

S. Johnson, J. Joannopoulos, “Block-iterative frequency-domain methods for Maxwell’s equations in a planewave basis,” Opt. Express 8(3), 173–190 (2001).
[CrossRef] [PubMed]

J.-M. Brosi, C. Koos, L. C. Andreani, M. Waldow, J. Leuthold, W. Freude, “High-speed low-voltage electro-optic modulator with a polymer-infiltrated silicon photonic crystal waveguide,” Opt. Express 16(6), 4177–4191 (2008).
[CrossRef] [PubMed]

J. H. Wülbern, A. Petrov, M. Eich, “Electro-optical modulator in a polymerinfiltrated silicon slotted photonic crystal waveguide heterostructure resonator,” Opt. Express 17(1), 304–313 (2009).
[CrossRef] [PubMed]

T. Liu, R. Panepucci, “Confined waveguide modes in slot photonic crystal slab,” Opt. Express 15(7), 4304–4309 (2007).
[CrossRef] [PubMed]

P. J. Bock, P. Cheben, J. H. Schmid, J. Lapointe, A. Delâge, S. Janz, G. C. Aers, D.-X. Xu, A. Densmore, T. J. Hall, “Subwavelength grating periodic structures in silicon-on-insulator: a new type of microphotonic waveguide,” Opt. Express 18(19), 20251–20262 (2010).
[CrossRef] [PubMed]

Opt. Lett. (5)

Photonics Journal, IEEE (1)

M. G. Scullion, T. F. Krauss, A. Di Falco, “High efficiency interface for coupling into slotted photonic crystal waveguides,” Photonics Journal, IEEE 3(2), 203–208 (2011).
[CrossRef]

Photonics Nanostruct. Fundam. Appl. (1)

A. Di Falco, L. O’Faolain, T. F. Krauss, “Photonic crystal slotted slab waveguides,” Photonics Nanostruct. Fundam. Appl. 6(1), 38–41 (2008).
[CrossRef]

Selected Topics in Quantum Electronics, IEEE Journal of (1)

R. Soref, “The past, present, and future of silicon photonics,” Selected Topics in Quantum Electronics, IEEE Journal of 12(6), 1678–1687 (2006).
[CrossRef]

Other (1)

L. Vivien and L. Pavesi, Handbook of Silicon Photonics (Taylor & Francis, 2013).

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Figures (6)

Fig. 1
Fig. 1

Slot photonic crystal waveguides: a) Typical slot waveguide configuration, showing the electromagnetic density confinement in and close to the slot. b) Typical dispersion diagram of a silicon on insulator (SOI) slot photonic crystal waveguide, showing the two even symmetry modes within the photonic crystal bandgap: the fundamental “slot” mode (red) and the 1st “W1-like” one (green). c) Even guided “slot” mode: ε|E|2 pattern coming from the Slot Waveguide. d) Even guided “W1” mode: ε|E|2 pattern originating from the W1 line defect.

Fig. 2
Fig. 2

a) Schematic structure of the proposed asymmetric directional coupler. Light yellow denotes low index material and green denotes silicon. And for the convenience of observation, the low index material is transparent. The red arrow presents the light flow at the PM wavelength. b) 2D top view of the asymmetric directional coupler with the main used notations.

Fig. 3
Fig. 3

Dispersion curves for the subwavelength corrugated strip waveguides and the SPCW. a) The phase matching frequency changes with Wsub and t for the W1-like SPCW mode. b) The phase matching frequency changes with Wsub and t for the fundamental slot mode.

Fig. 4
Fig. 4

Dispersion curves of the ADC supermodes in the configuration of Fig. 3(b). Wslot = 0.8a, Wsub = 1.14a, t = 0.6. The magnetic field (Hz) component distributions of points A1-A3 and B1-B3 labeled in the dispersion curves are displayed in the right part.

Fig. 5
Fig. 5

a), b) and c) are the magnetic field (Hz) steady-state maps for fundamental slot mode with group index of 25, 30 and 40.

Fig. 6
Fig. 6

Investigation of the proposed side-coupling efficiency from a subwavelength corrugated strip waveguide into the fundamental mode of a slot photonic crystal waveguides in three slow-light configurations: nG = 25, nG = 30, nG = 40. In the three situations, the asymmetrical directional coupler has a length of around 12µm.

Tables (1)

Tables Icon

Table 1 Structural Parameters after Modification and Corresponding Phase Matching Wavelengths

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