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Distributed Bragg reflector structures based on PT-symmetric coupling with lowest possible lasing threshold.

Mykola Kulishov, Bernard Kress

    Optics Express
    |October 10, 2013
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel design for distributed Bragg reflector (DBR) structures using parity-time (PT) symmetry. The new approach enables unidirectional light coupling, leading to ultra-low lasing thresholds and potential optical memory applications.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Distributed Bragg reflectors (DBRs) are crucial for laser cavities and optical filters.
    • Existing DBR designs face limitations in controlling light propagation directionality and achieving low thresholds.
    • Recent advancements in parity-time (PT) symmetry offer new possibilities for manipulating light in optical structures.

    Purpose of the Study:

    • To propose a new design for optimized distributed Bragg reflector (DBR) structures.
    • To leverage the concept of parity-time (PT) symmetry in optics for enhanced DBR functionality.
    • To explore unidirectional mode coupling and its implications for lasing and optical memory.

    Main Methods:

    • Utilizing unidirectional gratings with PT symmetric properties for co-directional mode coupling.
    • Implementing superimposed index and gain/loss modulations with a quarter-period shift.
    • Modeling transmission and reflection properties using the transfer matrix approach.

    Main Results:

    • Demonstrated co-directional mode coupling occurring exclusively in one direction.
    • Achieved a very low lasing threshold due to 100% reflectivity of Bragg mirrors and unidirectional signal release.
    • Identified potential for the structure to function as an optical memory unit capable of replicating input optical waveforms.

    Conclusions:

    • The proposed PT symmetric DBR structure offers a significant advancement in optical device design.
    • The unidirectional coupling mechanism enables unprecedented control over light propagation, leading to ultra-low lasing thresholds.
    • This innovative approach opens new avenues for high-performance lasers and optical data storage solutions.