Optoelectronic Modulation of Millimeter-Waves by Picosecond Pulses
We report here a new class of device — optoelectronic millimeter-wave modulator. The interaction of millimeter-wave with optically induced electron- hole plasma in a semiconductor facilitates the control of the phase and/or amplitude of the wave as it propagates through the waveguiding structure. Conversely, millimeter-waves serve as excellent probe on the transient behavior of the charge carriers induced by picosecond optical pulses. The plasma density at which the value of the plasma frequency equals the frequency of the millimeter-wave is in the range of l013 to 1014/cm3. This shows that millimeter-waves are sensitive to the optically induced plasma layer in the waveguide.
KeywordsAttenuation Ferrite GaAs Refraction
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