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In a recent experiment, we tested a single 7 llm diode from the same batch in a crossed waveguide frequency tripler. 6%. In order to investigate how the frequency multiplier behaves when the electrons are driven to high velocities, an HBV with a low doping concentration in the modulation layer has been tested in a frequency tripler. The electron velocity is inversely proportional to the doping concentration, see Eq. 11. The HBV tested was a single 7 llm diode fabricated on a copper substrate from the lTME 1557 material.

_--11 Semi insulating substrate Figure 9. Two different planar topologies with HBV diodes in series configuration. Figure 9 shows two different planar topologies. In Figure 9a the diodes are isolated by etching a surface channel. This topology, developed at the University of Virginia [32], [33], offers low parasitic capacitances due to the long air-bridge fingers. Figure 9b shows a topology where the contact pads sit directly on the semi-insulating substrate which may be more suitable for integrated circuits (MMIC).

Rev. B 53, 6889 (1996). P. Harrison, R. W. Kelsall, K. Donovan, and P. Kinsler, "Solid State Terahertz sources Using Quantum Well Intersubband Transitions" IEEE Transactions on Microwave Theory and Technology 48, 645 (2000). P. Kinsler, P. Harrison, R. W. Kelsall, "Intersubband Electron-Electron Scattering in Assymetric Quantum Wells Designed for Far Infrared Emission" Phys. Rev. B 58, 4774 (1998). G. A. Askaryan "Cherenkov Radiation and Transition Radiation from Electromagnetic Waves" Zh. Eksp.

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A guide to making energy-smart purchases by Energy Efficiency and Renewable Energy Clearinghouse (U.S.)

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