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

Wang, Zheng; Xu, Xiaochuan; Fan, Donglei; Wang, Yaguo; Subbaraman, Harish; Chen, Ray T.

doi:10.1038/srep24106

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

Journal Article · Thu May 05 00:00:00 EDT 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep24106· OSTI ID:1257628

Wang, Zheng ^[1]; Xu, Xiaochuan ^[2]; Fan, Donglei ^[3]; Wang, Yaguo ^[3]; Subbaraman, Harish ^[2]; Chen, Ray T. ^[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)
Univ. of Texas, Austin, TX (United States). Materials Science and Engineering Program; Univ. of Texas, Austin, TX (United States). Department of Mechanical Engineering
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)

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.

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Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0013178

OSTI ID:: 1257628

Journal Information:: Scientific Reports, Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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Tamm plasmon sub-wavelength structuration for loss reduction and resonance tuning Gubaydullin, A. R.; Symonds, C.; Benoit, J. -M. Applied Physics Letters, Vol. 111, Issue 26 https://doi.org/10.1063/1.4991025	journal	December 2017
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