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Title: Geometrical tuning art for entirely subwavelength grating waveguide based integrated photonics circuits

Here, subwavelength grating (SWG) waveguide is an intriguing alternative to conventional optical waveguides due to the extra degree of freedom it offers in tuning a few important waveguide properties, such as dispersion and refractive index. Devices based on SWG waveguides have demonstrated impressive performances compared to conventional waveguides. However, the high loss of SWG waveguide bends jeopardizes their applications in integrated photonic circuits. In this work, we propose a geometrical tuning art, which realizes a pre-distorted refractive index profile in SWG waveguide bends. The pre-distorted refractive index profile can effectively reduce the mode mismatch and radiation loss simultaneously, thus significantly reduce the bend loss. This geometry tuning art has been numerically optimized and experimentally demonstrated in present study. Through such tuning, the average insertion loss of a 5 μm SWG waveguide bend is reduced drastically from 5.43 dB to 1.10 dB per 90° bend for quasi-TE polarization. In the future, the proposed scheme will be utilized to enhance performance of a wide range of SWG waveguide based photonics devices.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [2] ;  [4]
  1. Univ. of Texas, Austin, TX (United States). Materials Science and Engineering Program; Univ. of Texas, Austin, TX (United States). Department of Electrical and Computer Engineering
  2. Omega Optics, Austin, TX (United States)
  3. Univ. of Texas, Austin, TX (United States). Materials Science and Engineering Program; Univ. of Texas, Austin, TX (United States). Department of Mechanical Engineering
  4. Univ. of Texas, Austin, TX (United States). Materials Science and Engineering Program; Univ. of Texas, Austin, TX (United States). Department of Electrical and Computer Engineering; Omega Optics,Austin,TX. (United States)
Publication Date:
OSTI Identifier:
1257628
Grant/Contract Number:
SC0013178
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Univ. of Texas, Austin, TX (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY integrated optics; silicon photonics