石墨烯/金复合薄膜微纳光纤集成光控波导

doi:10.3969/j.issn.0255-8297.2018.05.002

Abstract

Abstract: An all-optical modulator is fabricated with sandwich structure of graphene/Au thin film coupled microfiber. The whole structure is sealed by polydimethylsiloxane (PDMS). The Au film can confine the evanescent field and enhance the interaction between evanescent field and graphene. This device exhibits strong optical polarization and saturation absorption effect, resulting in a polarization extinction ratio of up to 42.3 dB at 1 550 nm. Because the S-polarization light exhibits more intensive interaction with graphene, the modulation effect can be enhanced when pump and signal both are in S-polarization. The experimental result shows that a high modulation amplitude of 41.0 dB can be reached with a 130 mW pump light at 980 nm, whereas the 3 dB and 10 dB modulation amplitudes correspond to pump lights of 2.8 mW and 5.6 mW, respectively.

Key words: polarization, saturable absorption, Au film, optical waveguide, microfiber, graphene

CLC Number:

P751.1

LI Qin-you, ZHOU Ai, GUO Dong-lai. Graphene/Au Thin Film Coupled Microfiber All-Optical Modulator[J]. Journal of Applied Sciences, 2018, 36(5): 748-755.

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Graphene/Au Thin Film Coupled Microfiber All-Optical Modulator

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