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Issue 15, 2018
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Improved performance of optical phased arrays assisted by transparent graphene nanoheaters and air trenches

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Abstract

In this paper, high-performance optical phased arrays (OPAs) assisted by transparent graphene nanoheaters and air trenches have been designed and simulated. By directly locating graphene nanoheaters on silicon waveguides, heating efficiency is enhanced by 62.96% compared to conventional structures with 1 μm SiO2 overlays, and is further enhanced by a factor of 200% by the presence of air trenches. Thanks to the high thermal conductivity of graphene, a record-high operation speed on the order of 200 kHz is realized. Power consumption for π phase shift is 4.65 mW, approximately half of that of the state-of-the-art OPAs. By introducing air trenches, thermal crosstalk is significantly reduced, resulting in an enlarged fill factor. In addition, a novel beam steering scheme in the θ direction is proposed. By applying a 30 mW heating power, a temperature gradient along antennas is generated and beam steering of 2.3° is achieved, satisfying applications such as long-range collision avoidance for autonomous driving.

Graphical abstract: Improved performance of optical phased arrays assisted by transparent graphene nanoheaters and air trenches

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Publication details

The article was received on 08 Dec 2017, accepted on 13 Feb 2018 and first published on 23 Feb 2018


Article type: Paper
DOI: 10.1039/C7RA13154B
RSC Adv., 2018,8, 8442-8449
  • Open access: Creative Commons BY license
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    Improved performance of optical phased arrays assisted by transparent graphene nanoheaters and air trenches

    Y. Wang, L. Liang, Y. Chen, P. Jia, L. Qin, Y. Liu, Y. Ning and L. Wang, RSC Adv., 2018, 8, 8442
    DOI: 10.1039/C7RA13154B

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