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Optical circuits based on polariton neurons in semiconductor microcavities
T C H Liew1, A V Kavokin, I A Shelykh
1School of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom.
Physical Review Letters
|September 4, 2008
Summary
Polaritons in semiconductor microcavities can act as optical neurons, guiding polarized signals. Their spin interactions enable binary logic gates, forming integrated optical circuits on a chip.
Area of Science:
- Condensed Matter Physics
- Optics
- Nanotechnology
Background:
- Semiconductor microcavities host exotic quasiparticles called polaritons.
- Polaritons exhibit unique spin-dependent properties and polarization multistability.
- Developing on-chip optical logic and signal processing is a key technological goal.
Purpose of the Study:
- To demonstrate the use of polariton polarization multistability for signal conduction.
- To realize binary logic gates based on polariton spin interactions.
- To show the potential for integrating these gates into optical circuits.
Main Methods:
- Exploiting the polarization multistability of polaritons in semiconductor microcavities.
- Utilizing the spin-dependent interactions between polaritons.
- Designing and integrating multiple polariton logic gates within a single microcavity.
Main Results:
- Demonstrated controlled conduction of polarized signals along defined channels ('neurons') within the microcavity plane.
- Successfully realized binary logic gates operating on the polarization degree of freedom.
- Showcased the integration of multiple logic gates to form a functional optical circuit.
Conclusions:
- Polariton polarization multistability offers a novel pathway for on-chip optical signal processing and computing.
- Spin interactions of polaritons are a viable mechanism for implementing optical logic gates.
- Semiconductor microcavities can serve as platforms for complex integrated optical circuits.
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