Abstract
We have investigated a THz detection scheme based on mixing of electrical signals in a voltage-dependent capacitance made out of suspended graphene. We have analyzed both coherent and incoherent detection regimes and compared their performance with the state of the art. Using a high-amplitude local oscillator, we anticipate potential for quantum limited detection in the coherent mode. The sensitivity stems from the extraordinary mechanical and electrical properties of atomically thin graphene or graphene-related 2D materials.
Highlights
Interest in THz detection and imaging technologies is traditionally motivated by astronomy and more recently by a growing demand for new solutions for enhancing public security
We propose an original scheme of detecting THz radiation using antenna-coupled mechanical resonators based on atomically thin two-dimensional materials
The mechanical capacitance has to be matched to a measurement system which is done by employing an electromagnetic cavity
Summary
Interest in THz detection and imaging technologies is traditionally motivated by astronomy and more recently by a growing demand for new solutions for enhancing public security. We propose an original scheme of detecting THz radiation using antenna-coupled mechanical resonators based on atomically thin two-dimensional materials. As the performance of this scheme relies heavily on the properties of the mechanical detector element, we have chosen to employ graphene in our device. Graphene shows great promise for superior sensitivity owing to its high Young’s modulus E ∼ 1 TPa and extremely light weight. The mechanical capacitance has to be matched to a measurement system which is done by employing an electromagnetic cavity (or lumped element circuit). Our mechanical THz detection setting resembles an optomechanical system, but has a different type of coupling between electrical signals and the mechanical motion. Our setup requires superconducting elements to deliver sufficiently large quality factors, which facilitate our detectors to reach the quantum limit of sensitivity
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