Fig. 4: Frequency stability study by means of Allan deviations. | Communications Physics

Fig. 4: Frequency stability study by means of Allan deviations.

From: Uncooled thermal infrared detection near the fundamental limit using a silicon nitride nanomechanical resonator with a broadband absorber

Fig. 4

a Study of the photothermal back-action frequency noise (black line) induced by the readout laser for a 1 mm membrane (yellow and purple line). The laser power was 15.4 μW. b Frequency stability of the (2,2) mode of a well-performing 2 mm resonator (solid yellow line) compared to theoretical thermal fluctuation noise (dotted black curve) and total phase noise (solid black curve). The experimental detection to thermomechanical noise ratio was \({{{\mathcal{K}}}}=0.006\), the laser power was 6.78 μW and the thermomechanical peak amplitude was \({S}_{{{{{\rm{y}}}}}_{{{{\rm{th}}}}}}({\omega }_{0})=9.8\times 1{0}^{-23}\,{{{{\rm{m}}}}}^{2}{{{{\rm{Hz}}}}}^{-1}\). The blue band highlights the uncertainty due to different possible material parameter values (Table 1).

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