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Inducing optical self-pulsation by electrically tuning graphene on a silicon microring
Nanophotonics ( IF 7.5 ) Pub Date : 2022-05-02 , DOI: 10.1515/nanoph-2022-0077
Marcus Tamura 1 , Hugh Morison 1 , Bhavin J Shastri 1
Affiliation  

A mechanism for self-pulsation in a proposed graphene-on-silicon microring device is studied. The relevant nonlinear effects of two photon absorption, Kerr effect, saturable absorption, free carrier absorption, and dispersion are included in a coupled mode theory framework. We look at the electrical tunability of absorption and the Kerr effect in graphene. We show that the microring can switch from a stable rest state to a self-pulsation state by electrically tuning the graphene under constant illumination. This switching is indicative of a supercritical Hopf bifurcation since the frequency of the pulses is approximately constant at 7 GHz and the amplitudes initial grow with increasing Fermi level. The CMOS compatibility of graphene and the opto-electronic mechanism allows this to device to be fairly easily integrated with other silicon photonic devices.

中文翻译:

通过电调谐硅微环上的石墨烯诱导光学自脉动

研究了所提出的硅基石墨烯微环器件中的自脉冲机制。耦合模式理论框架中包含了两个光子吸收、克尔效应、可饱和吸收、自由载流子吸收和色散的相关非线性效应。我们研究石墨烯中吸收的电可调性和克尔效应。我们证明,通过在恒定照明下电调节石墨烯,微环可以从稳定的静止状态切换到自脉动状态。这种切换表明超临界 Hopf 分岔,因为脉冲频率大约恒定在 7 GHz,并且振幅最初随着费米能级的增加而增长。
更新日期:2022-05-02
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