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Modulating Phase by Metasurfaces with Gated Ultra-thin TiN Films


Active control over the flow of light is highly desirable because of its applicability to information processing, telecommunication, and spectroscopic imaging. In this paper, employing the tunability of carrier density in a 1-nm titanium nitride (TiN) film, we numerically demonstrate a deep phase modulation (PM) in an electrically tunable gold strip/TiN film hybrid metasurface. A 337° PM is achieved at 1.550 μm with a 3% carrier density change in TiN film. We also demonstrate that a continuous 180° PM can be realized at 1.537 μm by applying a realistic experiment-based gate voltage bias and continuously changing the carrier density in the TiN film. The proposed design of active metasurfaces capable of deep PM near the wavelength of 1.550 μm has considerable potential in active beam steering, dynamic hologram generation, and flat photonic devices with reconfigurable functionalities.

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Publication details

The article was received on 07 Jan 2019, accepted on 09 May 2019 and first published on 14 May 2019

Article type: Paper
DOI: 10.1039/C9NR00205G
Nanoscale, 2019, Accepted Manuscript

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    Modulating Phase by Metasurfaces with Gated Ultra-thin TiN Films

    H. Jiang, H. Reddy, D. Shah, Z. A. Kudyshev, S. Choudhury, D. Wang, Y. Jiang and A. V. Kildishev, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR00205G

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