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Optica Publishing Group
  • 2017 Conference on Lasers and Electro-Optics Pacific Rim
  • (Optica Publishing Group, 2017),
  • paper s1767

Broadband Slow-Light Enhancement of Nonlinear Effects with Plasmonic Structures

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Abstract

An upper limit of achievable nonlinearities in term of the maximum nonlinear index change Δnmax exists for any Kerr nonlinear material, because of optical damage, saturation, or high-order effects. Taking advantage of slow-light effects, a photonic-crystal waveguide can enhance nonlinear effects and achieve more effective nonlinearities than the bulk material, i.e., Δneff > Δnmax. However, this slow-light enhancement relies on a structural resonance and is thus narrowband. Here we report broadband slow-light enhancement of nonlinear effects using plasmonic metal-dielectric-metal (MDM) waveguides. We show that MDMs structure with a thin nonlinear dielectric layer can have strikingly large effective nonlinearity, more than ten times that of the material nonlinearity, over a large bandwidth. This is because MDM structures are uniquely capable of combining broadband slow-light effects and efficient use of the nonlinear material. We expect this work to advance the development of high performance Kerr nonlinear nanophotonic devices.

© 2017 Optical Society of America

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