Abstract
We discuss two alternative and complementary means of controlling radial phonon conduction for bolometers in two dimensions: by using phononic crystals or by roughening the surface of the membranes (Casimir limit). For phononic crystals, we present new experiments with a modified geometry and a larger hole periodicity than before, achieving a low thermal conductance \({\sim }2\) pW/K at 150 mK. Calculations in the Casimir limit, on the other hand, show that for small detector dimensions thermal conductance below 1 fW/K seems achievable.
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This research was supported by Academy of Finland project Number 260880.
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Maasilta, I.J., Puurtinen, T.A., Tian, Y. et al. Phononic Thermal Conduction Engineering for Bolometers: From Phononic Crystals to Radial Casimir Limit. J Low Temp Phys 184, 211–216 (2016). https://doi.org/10.1007/s10909-015-1372-0
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DOI: https://doi.org/10.1007/s10909-015-1372-0