Resonant bolometric subterahertz detection in a 2D plasmonic cavity

The two-dimensional plasma resonance excited in the channel of a field effect transistor has recently been utilized as the frequency-selective absorber in a monolithic far infrared plasmonic cavity detector. In this article we discuss the relevant parameters pertaining to engineering the plasmonic cavity and an integrated detection element as constituent elements of a resonant far infrared detector. The spectra of low-order plasmon modes in 18 μm and 34 μm long two-dimensional plasmonic cavities with 4 μm period grating gates have been measured. When the length of the plasma cavity is significantly larger than the gate length or period, the cavity length rather than grating period defines the plasmon wavevector. Electronic noise sources are considered; random telegraph noise is suggested as a dominant noise source when the device is operated as a highly resistive bolometric detector.

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