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Title: High quality factor subwavelength grating waveguide micro-ring resonator based on trapezoidal silicon pillars

Journal Article · · Optics Letters
DOI:https://doi.org/10.1364/OL.41.003375· OSTI ID:1290581
 [1];  [2];  [1];  [1];  [3]
  1. Univ. of Texas, Austin, TX (United States)
  2. Omega Optics, Inc., Austin, TX (United States)
  3. Univ. of Texas, Austin, TX (United States); Omega Optics, Inc., Austin, TX (United States)
+ Show Author Affiliations

Subwavelength grating waveguide-based micro-ring resonators (SWGMRs) are a promising platform for research in light–matter interaction. However, it is extremely difficult to achieve small radius SWGMR devices (e.g., 5 μm) with satisfying quality factors (e.g., ~10,000). One major issue is the large bend loss of small radius SWGMRs. In this work, we report the use of trapezoidal silicon pillars instead of conventional rectangular silicon pillars as building blocks of SWGMRs. We found that an asymmetric effective refractive index profile created by trapezoidal silicon pillars can significantly reduce the bend loss and therefore increase the quality factors of SWGMRs. For the first time to the best of our knowledge, we have experimentally demonstrated a 5 μm radius SWGMR made of trapezoidal silicon pillars (T-SWGMR) with an applicable quality factor as high as 11,500, 4.6 times of that (~2800) offered by a conventional SWGMR made of rectangular silicon pillars, which indicates an 81.4% reduction of the propagation loss. This approach can also be readily employed to enhance SWGMRs with larger radii. Furthermore, we have also experimentally demonstrated a 10 μm radius T-SWGMR with a quality factor as high as 45,000, which indicates a propagation loss as low as 6.07 dB/cm.

Research Organization:
Omega Optics, Inc., Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
SC0013178
OSTI ID:
1290581
Alternate ID(s):
OSTI ID: 1262103
Journal Information:
Optics Letters, Vol. 41, Issue 14; ISSN 0146-9592
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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Cited By (7)

Ultra-Sharp Multi-Mode Waveguide Bending Assisted with Metamaterial-Based Mode Converters journal January 2018
Diffraction-less propagation beyond the sub-wavelength regime: a new type of nanophotonic waveguide journal March 2019
Side-mode suppressed filter based on anangular grating-subwavelength grating microring resonator with high flexibility in wavelength design journal January 2019
High-sensitivity complex refractive index sensing based on Fano resonance in the subwavelength grating waveguide micro-ring resonator journal January 2017
Multimode silicon photonics journal November 2018
Silicon Photonic Biosensors Using Label-Free Detection journal October 2018
Silicon Photonic Biosensors Using Label-Free Detection text January 2019

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