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Waveguide grating coupler with subwavelength microstructures
Abstract
We propose a silicon waveguide-fiber grating coupler that uses a subwavelength microstructure to achieve a continuously variable grating strength yet can be fabricated using only a single etch step. By adjusting the subwavelength microstructure at every point along the grating, the grating coupler can be optimized to give high field overlap with the optical fiber mode and also minimize backreflections along the incident waveguide path. Our design example is optimized for quasi-TM mode in a silicon photonic-wire waveguide, as required for waveguide evanescent-field-sensing applications. A field overlap of up to 94% with a standard single-mode optical fiber (SMF-28) is achieved by coupler apodization. Backreflection from the grating is reduced to ~0.1%, and the total predicted photonic wire to fiber coupling efficiency is 50%.
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Cited by
Waveguide sub‐wavelength structures: a review of principles and applications
Halir, R., Bock, P. J., Cheben, P., Ortega‐Moñux, A., Alonso‐Ramos, C., Schmid, J. H., Lapointe, J., Xu, D., Wangüemert‐Pérez, J. G., Molina‐Fernández, Í., et al. (2015) · Laser & Photonics Reviews · doi:10.1002/lpor.201400083 · Cited by 658
Self-citationCoupling strategies for silicon photonics integrated chips [Invited]
Marchetti, R., Lacava, C., Carroll, L., Gradkowski, K., & Minzioni, P. (2019) · Photonics Research · doi:10.1364/prj.7.000201 · Cited by 635
Bock, P. J., Cheben, P., Schmid, J. H., Lapointe, J., Delâge, A., Janz, S., Aers, G. C., Xu, D.-X., Densmore, A., & Hall, T. J. (2010) · Optics Express · doi:10.1364/oe.18.020251 · Cited by 314
Self-citationGrating Couplers on Silicon Photonics: Design Principles, Emerging Trends and Practical Issues
Cheng, L., Mao, S., Li, Z., Han, Y., & Fu, H. (2020) · Micromachines · doi:10.3390/mi11070666 · Cited by 299
Cheben, P., Bock, P. J., Schmid, J. H., Lapointe, J., Janz, S., Xu, D.-X., Densmore, A., Delâge, A., Lamontagne, B., & Hall, T. J. (2010) · Optics Letters · doi:10.1364/ol.35.002526 · Cited by 298
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Metadata
- Authors
- Halir, R., Cheben, P., Janz, S., Xu, D.-X., Molina-Fernández, Í., & Wangüemert-Pérez, J. G.
- Venue
- Optics Letters
- Publisher
- Optica Publishing Group
- Published
- 2009-04-24
- Volume
- 34
- Issue
- 9
- Pages
- 1408
- ISSN
- 0146-9592 (ISSN-L)
- 1539-4794
- OpenAlex
- W2075990040
- Cited by
- 215
- References
- 0
- FWCI
- 11.09
- Type
- journal article
- Language
- en
- Open access
- closed
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- Halir, R., Cheben, P., Janz, S., Xu, D.-X., Molina-Fernández, Í., & Wangüemert-Pérez, J. G. (2009). Waveguide grating coupler with subwavelength microstructures. Optics Letters. https://doi.org/10.1364/ol.34.001408
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