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Polaritonic frequency-comb generation and breather propagation in a negative-index metamaterial with a cold four-level atomic medium

Asgarnezhad Zorgabad, S ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevA.99.051802
  3. Publisher: American Physical Society , 2019
  4. Abstract:
  5. We develop a concept for a waveguide that exploits spatial control of nonlinear surface-polaritonic waves. Our scheme includes an optical cavity with four-level N-type atoms in a lossless dielectric placed above a negative-index metamaterial layer. We propose exciting a polaritonic Akhmediev breather at a certain position of the interface between the atomic medium and the metamaterial by modifying laser-field intensities and detunings. Furthermore, we propose generating position-dependent polaritonic frequency combs by engineering widths of the electromagnetically induced transparency window commensurate with the surface-polaritonic modulation instability. Therefore, this waveguide acts as a high-speed polaritonic modulator and position-dependent frequency-comb generator, which can be applied to compact photonic chips
  6. Keywords:
  7. Atoms ; Waveguides ; Electromagnetically-induced transparency ; Frequency combs ; Lossless dielectrics ; Modulation instabilities ; Negative index metamaterial ; Nonlinear surface ; Optical cavities ; Position dependents ; Metamaterials
  8. Source: Physical Review A ; Volume 99, Issue 5 , 2019 ; 24699926 (ISSN)
  9. URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.99.051802