Ms. Ting Zhang Profile

Ting Zhang

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Proceedings Article | 9 September 2019 Presentation

UV surface plasmon resonance modification by graphene Pi plasmon resonance (Conference Presentation)

Xueling Cheng, Sourangsu Banerji, Jieying Mao, Sara Arezoomandan, Ting Zhang, Steve Blair, Berardi Sensale-Rodriguez, Yunshan Wang

Proceedings Volume 11086, 1108608 (2019) https://doi.org/10.1117/12.2529825

KEYWORDS: Graphene, Plasmons, Ultraviolet radiation, Aluminum, Surface plasmons, Resonance modification, Plasmonics, Absorption, Doping, Finite-difference time-domain method

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Despite of increasing understandings of UV plasmonic materials, materials that can enable active tuning of UV plasmonic resonance has not been reported. Here, we demonstrate a modification of UV SPR on an aluminum (Al) hole-array by coupling Graphene π plasmon resonance with Al SPR. Graphene monolayer exhibits an abnormal absorption peak in the UV region (270-290nm) due to π plasmon resonance. The location and intensity of the absorption peak depend on the position of Fermi-level, which can be adjusted by electric or chemical doping. Al SPR is shown here to be modified by coupling Graphene π plasmon resonance with Al SPR. FDTD simulation shows the modification of Al hole-array transmission by adding a single layer of Graphene on top. The shifts of transmission dips after adding a Graphene layer shows a distinct transition at around the Graphene π plasmon position. For transmission dips that are located at shorter wavelength compared to Graphene π plasmon, up to 8nm blue shifts occur after adding Graphene. On the other hand, up to 20nm redshifts occur for transmission dips that are at a longer wavelength relative to Graphene π plasmon. This change in the sign of shifts of transmission dips corresponds to the change in the sign of the real permittivity of Graphene. The amount of shifts diminishes as the transmission dip moves further away from Graphene π plasmon resonance into the visible spectrum. Experimentally we have observed redshifts of SPR dips but not blue shifts possibly due to the poor light collection below 250nm.

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