High detectivity terahertz radiation sensing using frequency-noise-optimized nanomechanical resonators
arxiv(2024)
摘要
We achieve high detectivity terahertz sensing using a silicon nitride
nanomechanical resonator functionalized with a metasurface absorber. High
performances are achieved by striking a fine balance between the frequency
stability of the resonator, and its responsivity to absorbed radiation. Using
this approach, we demonstrate a detectivity
D^*=3.4×10^9 cm·√(Hz)/W and a noise equivalent power
NEP=36 pW/√(Hz) that outperform the best
room-temperature on-chip THz detectors (i.e., pyroelectrics). Our optical
absorber consists of a 1-mm diameter metasurface, which currently enables a
0.5-3 THz detection range but can easily be scaled to other frequencies in the
THz and infrared ranges. In addition to demonstrating high-performance
terahertz sensing, our work unveils an important fundamental trade-off between
high frequency stability and high responsivity in thermal-based nanomechanical
radiation sensors.
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