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An ultracompact GRIN‐lens‐based spot size converter using subwavelength grating metamaterials

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1002/lpor.201900172
AuthorSearch for: ORCID identifier: https://orcid.org/0000-0002-6838-8641; Search for: ; Search for: ; Search for: ; Search for: 1; Search for: 1; Search for: ; Search for:
Affiliation
  1. National Research Council of Canada. Advanced Electronics and Photonics
FormatText, Article
Subjectgradual index; integrated optics; metamaterials; spot-size converters; subwavelength gratings
Abstract
Graded‐index materials offer virtually complete control over light propagation in integrated photonic chips but can be challenging to implement. Here, an anisotropic graded‐index metamaterial, synthesized with fully etched silicon subwavelength structures, is proposed. Based on this material, a spot size converter that expands the transverse electric (TE) mode field profile from a 0.5 µm wide silicon wire waveguide to a 15 µm wide waveguide within a length of only 14 µm is designed. Measured insertion losses are below 1 dB in an unprecedented 130 nm bandwidth, limited by the measurement setup, with full 3D finite‐difference time‐domain (FDTD) simulations predicting a bandwidth in excess of 300 nm. Furthermore, the device is well suited to feed fiber‐to‐chip grating couplers, while requiring a footprint ten times smaller than conventional adiabatic tapers.
Publication date
PublisherWiley
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In
  • Laser & Photonics Reviews 13, no. 11, 1900172: 1–7.
LanguageEnglish
Peer reviewedYes
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Record identifier2e0713e8-670f-47e8-a1bd-e511300acb63
Record created2020-11-20
Record modified2020-12-22
Date modified: