Designguidelinefor frequencytunable terahertz electromagnetic wave emittersonthe basis of semiconductorphysics

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We, on thebasisofsemiconductor physics, have investigated frequency tunable terahertz (THz) emitter. i-GaAs/ n-GaAs structures is suitable the frequency tunable THz emitters because their built-in electric field is controlled with the i-GaAs layer thickness. In addition, we have found that in the i-GaAs(d nm)/n-GaAs structure has frequency tenability. These characteristics are provided by the coupling mode between the longitudinal optical phonon and plasmon. We have taken account of the fact that the effect of the built-in electric field dominates the characteristics of the THz wave. We have found that the strained multiple quantum wells with the (11n) orientation emits the monochromatic the THzwave.