Fundamental Properteries and Capabilities of Plasmonic Antennas for Efficient Interaction with Nanoeletronics
Technical Report,01 Jul 2012,30 Jun 2015
University of Michigan - Ann Arbor Ann Arbor
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During the third year of this research program, we extended the powerful capabilities of the nano-plasmonic antennas that we demonstrated during the first two years to achieve record-high power terahertz radiation pulses. In this regard, we presented a novel design of large area photoconductive emitters which incorporates plasmonic contact electrodes to offer significantly higher optical-to-terahertz conversion efficiencies compared to conventional designs. The presented terahertz emitter can offer high power terahertz radiation because of its capacity to handle relatively high optical powers without suffering from the carrier screening effect and thermal breakdown. Additionally, it can offer broadband terahertz radiation due to the fact that terahertz radiation is generated by dipole nano-plasmonic antennas embedded within the device active area with dipole lengths much smaller than terahertz radiation wavelength. Moreover, use of plasmonic contact electrodes enables a more efficient separation and acceleration of photocarriers, enhancing the effective dipole moment induced within the device active area in response to an incident optical pump. We demonstrate broadband, pulsed terahertz radiation with record-high radiation power levels as high as 3.8 mW over 0.1-5 THz frequency range, exhibiting an order of magnitude higher optical-to-terahertz conversion efficiency compared to conventional designs.
- Electrooptical and Optoelectronic Devices
- Radiofrequency Wave Propagation