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Gain-Assisted Propagation and Angular Response of Surface Plasmon Resonance in Nonlinear Kretschmann Configuration

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Abstract

The present study investigates the optical characteristics and angular response of gain-assisted surface plasmon resonance incorporating a nonlinear Kretschmann configuration. Nonlinear susceptibility of two-level atoms is used to describe the gain and nonlinear characteristics of amplifying medium. The structure is investigated and compared in both linear and nonlinear regimes. Our theory presents surface plasmon polaritons (SPPs) amplification accounting for saturation of linear gain by nonlinear losses. Reflectivity curve of the Kretschamnn configuration, attenuation constant, propagation length, and magnetic field intensity of plasmonic wave at the interface provide direct proofs of saturated gain induced by nonlinear absorption loss. Linear analysis predicts enhanced total reflection (ETR) in the presence of gain while in nonlinear regime, no ETR phenomenon occurs due to nonlinear loss absorption. Our analysis verifies that in the presence of nonlinear absorption loss, a saturation tendency of propagation length and plasmonic intensity is inevitable which is coincident with the practical observations.

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Authors and Affiliations

  1. Department of Electrical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran

    Mojtaba Sadeghi & Zahra Adelpour

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  1. Mojtaba Sadeghi
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  2. Zahra Adelpour
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Correspondence to Mojtaba Sadeghi.

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Sadeghi, M., Adelpour, Z. Gain-Assisted Propagation and Angular Response of Surface Plasmon Resonance in Nonlinear Kretschmann Configuration. Plasmonics 12, 1107–1112 (2017). https://doi.org/10.1007/s11468-016-0364-5

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  • DOI: https://doi.org/10.1007/s11468-016-0364-5

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