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• W4220757675 abstract "Silicon nitride, with ultralow propagation loss and a wide transparency window, offers an exciting platform to explore integrated photonic devices for various emerging applications. It is appealing to combine the intrinsic optical properties of two-dimensional layered materials with high-quality optical waveguides and resonators to achieve functional devices in a single chip. Here we demonstrate a micro-ring resonator-based phase modulator integrated with few-layer <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m1> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>MoS</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> . The ionic liquid is employed directly on the surface of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m2> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>MoS</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> to form a capacitor configuration. The effective index of the composite <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m3> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>MoS</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> <mml:mo>–</mml:mo> <mml:mi>SiN</mml:mi> </mml:mrow> </mml:math> waveguide can be modulated via adjusting bias voltages to achieve different charged doping induced electro-refractive responses in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m4> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>MoS</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:math> film. The maximum effective index modulation of the composite <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m5> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>MoS</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> <mml:mo>–</mml:mo> <mml:mi>SiN</mml:mi> </mml:mrow> </mml:math> waveguide can be achieved to <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m6> <mml:mrow> <mml:mn>0.45</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mrow> <mml:mn>10</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>3</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> . The phase tuning efficiency is measured to be 29.42 pm/V, corresponding to a <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline id=m7> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi mathvariant=italic>V</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=italic>π</mml:mi> </mml:mrow> </mml:msub> <mml:mi mathvariant=italic>L</mml:mi> </mml:mrow> </mml:math> of 0.69 V·cm. Since the micro-ring resonator is designed near the critical coupling regime, the coupling condition between the bus waveguide and micro-ring resonator can also be engineered from under-coupling to over-coupling regime during the charged doping process. That can be involved as a degree of freedom for the coupling tailoring. The ability to modulate the effective index with two-dimensional materials and the robust nature of the heterostructure integrated phase modulator could be useful for engineering reliable ultra-compact and low-power-consumption integrated photonic devices." @default.
• W4220757675 created "2022-04-03" @default.
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• W4220757675 date "2022-05-16" @default.
• W4220757675 modified "2023-10-18" @default.
• W4220757675 title "Heterogeneous integrated phase modulator based on two-dimensional layered materials" @default.
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• W4220757675 doi "https://doi.org/10.1364/prj.453520" @default.
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