ErAs:GaAs photomixer with two-decade tunability and 12μW peak output power
- 1 November 2004
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 85 (18) , 3983-3985
- https://doi.org/10.1063/1.1813635
Abstract
This letter reports the fabrication and demonstration of an ErAs:GaAs interdigitated photomixer as a tunable THz source ranging from ∼ 20 GHz to ∼ 2 THz , with 12 μ W maximum power typically around ∼ 90 GHz . Each photomixer is coupled to a composite dipole-spiral planar antenna that emits a Gaussian-type beam into free space. The beam switches from dipole to spiral antenna behavior as the frequency increases. A distributed Bragg reflector is embedded in the device beneath the photomixer to increase its external quantum efficiency. The photomixer has a 900 Å thick silicon nitride coating which serves as an antireflection and passivation layer, and also improves the reliability and heat tolerance of the device.Keywords
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