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Tunable nonlinear parity-time-symmetric defect modes with an atomic cell.

Chao Hang, Dmitry A Zezyulin, Vladimir V Konotop

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    We demonstrate a tunable, highly nonlinear defect in a 1D photonic crystal using two-isotope, three-level atoms. This creates a parity-time (PT) symmetric refractive index, enabling stable nonlinear defect modes with a probe field.

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    Area of Science:

    • Nonlinear optics
    • Condensed matter physics
    • Quantum optics

    Background:

    • Photonic crystals offer unique light-manipulation properties.
    • Nonlinear optical effects are crucial for advanced photonic devices.
    • Defect engineering in photonic crystals enables localized optical modes.

    Purpose of the Study:

    • To propose a scheme for creating a tunable, highly nonlinear defect in a 1D photonic crystal.
    • To investigate the parity-time (PT) symmetry of the defect's refractive index.
    • To explore the formation of stable nonlinear defect modes.

    Main Methods:

    • Utilizing a one-dimensional photonic crystal with a defect cell.
    • Employing two isotopes of three-level atoms within the defect.
    • Applying a control field and Stark shifts from a far-off-resonance field to induce PT symmetry.
    • Analyzing the probe-field refractive index and defect modes.

    Main Results:

    • A tunable, highly nonlinear defect is proposed.
    • The defect's probe-field refractive index can be engineered to be parity-time (PT) symmetric.
    • Stable nonlinear defect modes are formed within the PT-symmetric system.
    • The PT symmetry is achieved through a combination of control fields and Stark shifts.

    Conclusions:

    • The proposed scheme provides a method for creating tunable nonlinear photonic crystal defects.
    • PT symmetry offers a pathway to achieve stable nonlinear optical phenomena.
    • This work has implications for the development of advanced optical devices and quantum information processing.