Advanced search
1 file | 733.24 KB Add to list

New wavelength-tuning method in optical ring resonators with liquid crystal cladding: exploiting the longitudinal E-field

Author
Organization
Abstract
We demonstrate tuning of the resonance wavelength of silicon-on-insulator optical ring resonators. The devices are clad with a layer of nematic liquid crystal. The electrooptic effect of the anisotropic liquid crystal allows us to change the effective index of the TE waveguide mode with an externally applied voltage. The electric field will reorient the liquid crystal director which alters the refractive index of the cladding layer. The evanescent tails of the waveguide mode feel this change. The change in effective index has a direct effect on the resonance wavelength. In our setup, the director tilts from an orientation parallel to the waveguides to an orientation perpendicular to the substrate. This way, it is the longitudinal component of the electric field of the light that experiences the largest change in refractive index. Starting from this principle, we show experimental tuning of the resonance wavelength over 0.6 nm towards shorter wavelengths. Theoretical considerations and simulations with a finite element modesolver capable of handling full anisotropy confirm the experimental results and provide insights in the tuning mechanism.
Keywords
nematic liquid crystal cladding, electrooptic effect, optical ring resonator, resonance wavelength-tuning method, silicon-on-insulator, refractive index, optical waveguides, optical tuning, optical resonators, optical fabrication, nematic liquid crystals, liquid crystal devices, finite element analysis, claddings, electro-optical effects, anisotropic liquid crystal, TE waveguide mode, electric field longitudinal component, finite element modesolver, Si-JkJk

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 733.24 KB

Citation

Please use this url to cite or link to this publication:

MLA
De Cort, Wout et al. “New Wavelength-tuning Method in Optical Ring Resonators with Liquid Crystal Cladding: Exploiting the Longitudinal E-field.” Proceedings of Spie - the International Society for Optical Engineering. Ed. Iam Choon Khoo. Vol. 7414. Bellingham, WA, USA: SPIE, the International Society for Optical Engineering, 2009. Print.
APA
De Cort, Wout, Beeckman, J., James, R., Fernandez, F. A., Baets, R., & Neyts, K. (2009). New wavelength-tuning method in optical ring resonators with liquid crystal cladding: exploiting the longitudinal E-field. In I. C. Khoo (Ed.), PROCEEDINGS OF SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING (Vol. 7414). Presented at the Liquid Crystals XIII, Bellingham, WA, USA: SPIE, the International Society for Optical Engineering.
Chicago author-date
De Cort, Wout, Jeroen Beeckman, Richard James, F Anibal Fernandez, Roel Baets, and Kristiaan Neyts. 2009. “New Wavelength-tuning Method in Optical Ring Resonators with Liquid Crystal Cladding: Exploiting the Longitudinal E-field.” In Proceedings of Spie - the International Society for Optical Engineering, ed. Iam Choon Khoo. Vol. 7414. Bellingham, WA, USA: SPIE, the International Society for Optical Engineering.
Chicago author-date (all authors)
De Cort, Wout, Jeroen Beeckman, Richard James, F Anibal Fernandez, Roel Baets, and Kristiaan Neyts. 2009. “New Wavelength-tuning Method in Optical Ring Resonators with Liquid Crystal Cladding: Exploiting the Longitudinal E-field.” In Proceedings of Spie - the International Society for Optical Engineering, ed. Iam Choon Khoo. Vol. 7414. Bellingham, WA, USA: SPIE, the International Society for Optical Engineering.
Vancouver
1.
De Cort W, Beeckman J, James R, Fernandez FA, Baets R, Neyts K. New wavelength-tuning method in optical ring resonators with liquid crystal cladding: exploiting the longitudinal E-field. In: Khoo IC, editor. PROCEEDINGS OF SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING. Bellingham, WA, USA: SPIE, the International Society for Optical Engineering; 2009.
IEEE
[1]
W. De Cort, J. Beeckman, R. James, F. A. Fernandez, R. Baets, and K. Neyts, “New wavelength-tuning method in optical ring resonators with liquid crystal cladding: exploiting the longitudinal E-field,” in PROCEEDINGS OF SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING, San Diego, CA, USA, 2009, vol. 7414.
@inproceedings{859724,
  abstract     = {We demonstrate tuning of the resonance wavelength of silicon-on-insulator optical ring resonators. The devices are clad with a layer of nematic liquid crystal. The electrooptic effect of the anisotropic liquid crystal allows us to change the effective index of the TE waveguide mode with an externally applied voltage. The electric field will reorient the liquid crystal director which alters the refractive index of the cladding layer. The evanescent tails of the waveguide mode feel this change. The change in effective index has a direct effect on the resonance wavelength. In our setup, the director tilts from an orientation parallel to the waveguides to an orientation perpendicular to the substrate. This way, it is the longitudinal component of the electric field of the light that experiences the largest change in refractive index. Starting from this principle, we show experimental tuning of the resonance wavelength over 0.6 nm towards shorter wavelengths. Theoretical considerations and simulations with a finite element modesolver capable of handling full anisotropy confirm the experimental results and provide insights in the tuning mechanism.},
  articleno    = {74140D},
  author       = {De Cort, Wout and Beeckman, Jeroen and James, Richard and Fernandez, F Anibal and Baets, Roel and Neyts, Kristiaan},
  booktitle    = {PROCEEDINGS OF SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING},
  editor       = {Khoo, Iam Choon},
  isbn         = {9780819477040},
  issn         = {0277-786X},
  keywords     = {nematic liquid crystal cladding,electrooptic effect,optical ring resonator,resonance wavelength-tuning method,silicon-on-insulator,refractive index,optical waveguides,optical tuning,optical resonators,optical fabrication,nematic liquid crystals,liquid crystal devices,finite element analysis,claddings,electro-optical effects,anisotropic liquid crystal,TE waveguide mode,electric field longitudinal component,finite element modesolver,Si-JkJk},
  language     = {eng},
  location     = {San Diego, CA, USA},
  pages        = {10},
  publisher    = {SPIE, the International Society for Optical Engineering},
  title        = {New wavelength-tuning method in optical ring resonators with liquid crystal cladding: exploiting the longitudinal E-field},
  url          = {http://dx.doi.org/10.1117/12.825669},
  volume       = {7414},
  year         = {2009},
}

Altmetric
View in Altmetric
Web of Science
Times cited: