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A self-supported ultrathin plasmonic film for ultrafast optical switching.

ABSTRACT: Self-supporting gold nanowire (AuNW) gratings with a thickness of about 200 nm are produced by solution-processing and flexible-transfer techniques. Such an ultrathin structure is applied as an ultrafast optical switch that enables low-threshold optical modulation with a high signal contrast and a high signal-to-noise ratio. Transient energy-band modification in gold under excitation by femtosecond laser pulses is the main responsible mechanism. For a pump fluence of about 170 μJ cm^-2, a modulation depth of about 10% is achieved for the optical switching signal. Self-supporting metallic plasmonic photonic thin films with a large area and flexible structures are important for applications in a large variety of circumstances and on different interfaces for optical signal processing, optical logic circuits, and optical communication systems.

SUBMITTER: Yang J

PROVIDER: S-EPMC9419710 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature

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A self-supported ultrathin plasmonic film for ultrafast optical switching.

Yang Jinghui J Fu Yulan Y Zhang Xinping X

Nanoscale advances 20220104 3

Self-supporting gold nanowire (AuNW) gratings with a thickness of about 200 nm are produced by solution-processing and flexible-transfer techniques. Such an ultrathin structure is applied as an ultrafast optical switch that enables low-threshold optical modulation with a high signal contrast and a high signal-to-noise ratio. Transient energy-band modification in gold under excitation by femtosecond laser pulses is the main responsible mechanism. For a pump fluence of about 170 μJ cm<sup>-2</sup> ...[more]

PMID: 36131823

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