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All-optical compact surface plasmonic two-mode interference device for optical logic gate operation.

Nilima Gogoi, Partha Pratim Sahu

    Applied Optics
    |May 14, 2015
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a compact surface plasmonic two-mode interference coupler for optical logic gates. The device utilizes refractive index modulation for NOT, AND, and OR gate operations, offering significant size reduction.

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    Area of Science:

    • Photonics and Nanophotonics
    • Optical Computing
    • Plasmonics

    Background:

    • Surface plasmon polaritons (SPPs) enable light manipulation at the nanoscale.
    • Two-mode interference (TMI) is a key principle for compact optical devices.
    • Integration of plasmonic devices with semiconductor materials is crucial for advanced functionalities.

    Purpose of the Study:

    • To propose and demonstrate an ultra-compact surface plasmonic two-mode interference (SPTMI) coupler.
    • To achieve basic logic gate operations (NOT, AND, OR) using the SPTMI coupler.
    • To investigate the optical pulse energy-dependent coupling characteristics of the device.

    Main Methods:

    • Fabrication of an SPTMI coupler with a silicon core and silver/GaAsInP cladding.
    • Modulation of the GaAsInP cladding's refractive index using optical pulse energy.
    • Analysis of coupling characteristics based on the induced phase change (ΔΦ(E)).
    • Demonstration of logic gate operations through controlled coupling.

    Main Results:

    • The proposed SPTMI coupler exhibits optical pulse energy-dependent coupling.
    • Successful implementation of NOT, AND, and OR logic gate operations.
    • Achieved a coupling length 32.3 times more compact than conventional multimode interference-directional couplers.

    Conclusions:

    • The SPTMI coupler is a highly compact and efficient platform for optical logic gates.
    • Refractive index modulation offers a viable method for controlling plasmonic coupling.
    • This technology holds promise for miniaturized optical computing systems.