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Epsilon-Near-Zero Plasmonic Waveguides for Enhanced Coherent Optical Effects

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Plasmon-enhanced light-matter interactions

Part of the book series: Lecture Notes in Nanoscale Science and Technology ((LNNST,volume 31))

Abstract

Plasmonic waveguides exhibit an effective epsilon-near-zero (ENZ) operation in their cut-off wavelength and Fabry-PĂ©rot resonances at lower wavelengths. In this chapter, we demonstrate a scheme to realize nonlinear coherent perfect absorption (CPA) at the nanoscale using the ENZ plasmonic waveguide nanochannels. The strong and uniform field enhancement inside the nanochannels of the waveguides at the ENZ resonance can efficiently boost Kerr nonlinearities, resulting in a new all-optical switching intensity-dependent CPA phenomenon which can be tunable with ultrafast speed. Our findings provide a new platform to efficiently excite nonlinear phenomena at the nanoscale and design tunable coherent perfect absorbers.

In addition, we demonstrate the formation of exceptional points (EP) in a nanoscale open and lossy (non-Hermitian) nanophotonic system based on gain medium embedded inside the ENZ plasmonic waveguide nanochannels. Reflectionless transmission (perfect loss compensation) at the nanoscale is realized at the EP, which coincides with the ENZ cut-off frequency of the proposed plasmonic system. This special spectral degeneracy point (EP) is a unique feature of the presented nanoscale symmetric plasmonic ENZ configuration, different from most of the previous works that were mainly focused on asymmetric bulky micron-scale active photonic configurations. When we further increase the gain coefficient of the dielectric material loaded in the waveguides, a spectral singularity occurs leading to super scattering (lasing) response at both forward and backward directions. The presented results demonstrate that ENZ plasmonic waveguides can enhance different coherent optical effects that can find a plethora of new applications.

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Acknowledgments

This work was partially supported by the National Science Foundation (DMR-1709612) and the Nebraska Materials Research Science and Engineering Center (MRSEC) (grant no. DMR-1420645). Ying Li is supported by the National Natural Science Foundation of China (Grant No. 12104233). Christos Argyropoulos is partially supported by the National Science Foundation/EPSCoR RII Track-1: Emergent Quantum Materials and Technologies (EQUATE) under Grant No. OIA-2044049.

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Authors and Affiliations

  1. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing, China

    Ying Li

  2. Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, USA

    Christos Argyropoulos

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  1. Ying Li
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  2. Christos Argyropoulos
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Correspondence to Christos Argyropoulos .

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  1. College of Optoelectronic Technology Chengdu University of Information Technology, Chengdu, China

    Peng Yu

  2. School of Physics and Technology, Wuhan University, Wuhan, China

    Hongxing Xu

  3. University of Electronic Science and Technology of China, Chengdu, China

    Zhiming M. Wang

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Li, Y., Argyropoulos, C. (2022). Epsilon-Near-Zero Plasmonic Waveguides for Enhanced Coherent Optical Effects. In: Yu, P., Xu, H., Wang, Z.M. (eds) Plasmon-enhanced light-matter interactions. Lecture Notes in Nanoscale Science and Technology, vol 31. Springer, Cham. https://doi.org/10.1007/978-3-030-87544-2_3

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