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We fabricated a novel resonant-tunneling-diode terahertz oscillator with high-frequency modulation structure for high-capacity terahertz communication and measured the frequency response using vector network analyzer. A very high cut-off frequency of 30 GHz in intensity modulation was obtained by the device oscillating at 350 GHz with reduced MIM capacitor of 0.7 pF.
graphene with its unique electric, thermal, and optical properties has proven to be a promising candidate for many of the next generation electronics application. In this report, we try to provide a clear undeniable evidence that proves our success in the development of a THz nano-sensor using the graphene nano-carbon material as a mean to utilize the thermoelectric current that can be generated due...
We proposed a resonant tunneling diode (RTD) with InAlGaAs/InP composite collector for reduction in transit delay caused by the gamma to L valley transition at the collector depletion region. Terahertz oscillators fabricated with this RTD show room-temperature fundamental oscillations of 680–770 GHz with the RTD areas of 1–1.5 square microns. Higher frequency will be possible by reducing the RTD area.
Room-temperature THz oscillators using resonant tunneling diodes are shown. Structures for short transit time are fabricated toward 1 THz fundamental oscillation. Oscillators with offset slot antenna and array configuration are demonstrated for high power. Bias-dependent frequency, spectral linewidth, and direct modulation are also reported.
A fundamental oscillation up to 915 GHz was observed at room temperature in InGaAs/AlAs resonant tunneling diode integrated with planar slot antennas. By reducing the mesa area, parasitic capacitance of resonant tunneling diode was decreased. The output power was small (around a few tens nW) at present because of a small area (ap0.63 mum2) and a low available current density (ap3 mA/mum2) which is...
Doppler frequency up conversion using optically generated electron-hole plasma in a planar transmission line has been investigated as a potential means for generating high power terahertz waves. Experiments performed at millimeter wavelengths have clearly proved that the Doppler frequency conversion with a frequency up conversion ratio of more than five can be achieved in a slotline with an optically...
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