Wednesday, April 27, 2016
Abstract-Graphene based plasmonic terahertz amplitude modulator operating above 100 MHz
The terahertz (THz) region of the electromagnetic holds great potential in many fields of study, from to biomedical imaging, remote gas sensing, and high speed communication. To fully exploit this potential, fast optoelectronic devices such as amplitude and phase must be developed. In this work, we present a room temperature external THz amplitude based on plasmonic bow-tie antenna arrays with By applying a modulating bias to a back gate electrode, the conductivity of is changed, which modifies the reflection characteristics of the incoming The broadband response of the device was characterized by using THz time-domain and the modulation characteristics such as the modulation depth and cut-off frequency were investigated with a 2.0 THz single frequency emission An optical modulation cut-off frequency of 105 ± 15 MHz is reported. The results agree well with a lumped element circuit model developed to describe the device.