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Role of higher order plasmonic modes in one-dimensional nanogratings

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Abstract

By theoretically investigating the optical behavior of one-dimensional gold nanogratings using Fourier Modal Method, we have shown that both integer and non-integer multiples of surface plasmon polariton wavelengths should be taken into consideration in special optical contrast ratio for highly sensitive sensing. The emergence of higher modes is the key factor for the formation of observed plasmonic band gap. Through considering the significant role of grating period and thickness respectively in horizontal and vertical surface resonances, it was demonstrated that for gold thicknesses below 100 nm, the dominant phenomenon is horizontal surface resonances while for increased thicknesses both horizontal and vertical surface resonances mediate. The transmission minima are insensitive to the grating thickness, which confirms that their origins are not vertical surface resonances. This study can open an avenue towards designing highly sensitive sensors with focus not only on the plasmonic resonance wavelength but also on its integer and non-integer multiples whose origins should be investigated in both horizontal and vertical surface resonances.

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Acknowledgements

This research was supported by a Grant from Cognitive Sciences and Technologies Council (2302) and Ministry of Science Research and Technology of Iran.

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Authors and Affiliations

  1. Magneto-plasmonic Lab, Laser and Plasma Research Institute, Shahid Beheshti University, Daneshju Boulevard, Tehran, 1983969411, Iran

    Foozieh Sohrabi & Seyedeh Mehri Hamidi

  2. Bioengineering Department, École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland

    Foozieh Sohrabi & Ershad Mohammadi

  3. Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran

    Ershad Mohammadi

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  1. Foozieh Sohrabi
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  2. Seyedeh Mehri Hamidi
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  3. Ershad Mohammadi
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Correspondence to Seyedeh Mehri Hamidi.

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Sohrabi, F., Hamidi, S.M. & Mohammadi, E. Role of higher order plasmonic modes in one-dimensional nanogratings. Opt Quant Electron 51, 241 (2019). https://doi.org/10.1007/s11082-019-1958-x

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