Abstract
Self-mixing of terahertz electromagnetic wave occurs in a field-effect electron channel when the terahertz electric field modulates both the local electron density and the drift velocity. In order to realize sensitive terahertz detection, asymmetry in the electric field and/or the charge density is required for generation of a unidirectional photocurrent/voltage. Existing hydrodynamic detection theories are reviewed and discussed. A detector model taking into account the spatial distributions of both the terahertz electric field and the electron density in the gated electron channel is developed in this chapter. The model presents full detector characteristics when both a source–drain bias and a gate voltage are applied. The model suggests that an asymmetric distribution of terahertz electric field is preferred for high-responsivity terahertz detection without a source–drain bias. The strength of terahertz photoresponse is characterized by the self-mixing factor and the field-effect factor. The former factor can be optimized by a strongly asymmetric and enhanced terahertz near field by using asymmetric terahertz antennas. Simulations based on the FDTD method confirm the effectiveness of asymmetric antenna design and the low-pass filter to isolate the antenna blocks from the electrical bonding pads for the detector.
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Sun, J. (2016). Field-Effect Self-Mixing Mechanism and Detector Model. In: Field-effect Self-mixing Terahertz Detectors. Springer Theses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-48681-8_2
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DOI: https://doi.org/10.1007/978-3-662-48681-8_2
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