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Excitonic Circuits: New Tools for Manipulating Photons

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Scientists are learning more about the potential of excitons in applications from telecommunications to tunable lasers.

David W. Snoke, University of Pittsburgh

Electronics uses electrons. Photonics uses photons. Recently, the new field of spintronics has been defined, which uses spins for signals. Could we eventually have excitonics, circuits based on the control of excitons? Although excitons have been investigated for more than 50 years, many people are still unfamiliar with them. An exciton is a quantum of excitation in a medium (Figure 1). Figure 1. An exciton is an electron-hole pair that is created when an electron is excited from a lower- to a higher-energy state. When a photon excites an electron from a lower state to a...Read full article

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    Published: January 2006
    Glossary
    astronomy
    The scientific observation of celestial radiation that has reached the vicinity of Earth, and the interpretation of these observations to determine the characteristics of the extraterrestrial bodies and phenomena that have emitted the radiation.
    electronics
    That branch of science involved in the study and utilization of the motion, emissions and behaviors of currents of electrical energy flowing through gases, vacuums, semiconductors and conductors, not to be confused with electrics, which deals primarily with the conduction of large currents of electricity through metals.
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    astronomyBasic ScienceelectronicselectronsenergyFeaturesphotonicsphotonsSensors & Detectors

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