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dc.contributor.authorPuurtinen, Tuomas
dc.contributor.authorMaasilta, Ilari
dc.date.accessioned2016-12-14T06:10:59Z
dc.date.available2016-12-14T06:10:59Z
dc.date.issued2016
dc.identifier.citationPuurtinen, T., & Maasilta, I. (2016). Low temperature heat capacity of phononic crystal membranes. <i>AIP Advances</i>, <i>6</i>(12), Article 121902. <a href="https://doi.org/10.1063/1.4968619" target="_blank">https://doi.org/10.1063/1.4968619</a>
dc.identifier.otherCONVID_26353900
dc.identifier.otherTUTKAID_71928
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/52328
dc.description.abstractPhononic crystal (PnC) membranes are a promising solution to improve sensitivity of bolometric sensor devices operating at low temperatures. Previous work has concentrated only on tuning thermal conductance, but significant changes to the heat capacity are also expected due to the modification of the phonon modes. Here, we calculate the area-specific heat capacity for thin (37.5 - 300 nm) silicon and silicon nitride PnC membranes with cylindrical hole patterns of varying period, in the temperature range 1 - 350 mK. We compare the results to two- and three-dimensional Debye models, as the 3D Debye model is known to give an accurate estimate for the low-temperature heat capacity of a bulk sample. We found that thin PnC membranes do not obey the 3D Debye T3 law, nor the 2D T2 law, but have a weaker, approximately linear temperature dependence in the low temperature limit. We also found that depending on the design, the PnC patterning can either enhance or reduce the heat capacity compared to an unpatterned membrane of the same thickness. At temperatures below 100 mK, reducing the membrane thickness unintuitively increases the heat capacity for all samples studied. These observations can have significance when designing calorimetric detectors, as heat capacity is a critical parameter for the speed and sensitivity of a device.
dc.language.isoeng
dc.publisherAmerican Institute of Physics
dc.relation.ispartofseriesAIP Advances
dc.subject.otherlow temperatures
dc.subject.otherphononic crystal membranes
dc.titleLow temperature heat capacity of phononic crystal membranes
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201612024899
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.contributor.oppiaineNanoscience Centerfi
dc.contributor.oppiaineNanoscience Centeren
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2016-12-02T04:20:11Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.relation.issn2158-3226
dc.relation.numberinseries12
dc.relation.volume6
dc.type.versionpublishedVersion
dc.rights.copyright© 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license
dc.rights.accesslevelopenAccessfi
dc.subject.ysolämpökapasiteetti
jyx.subject.urihttp://www.yso.fi/onto/yso/p11389
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1063/1.4968619


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© 2016 Author(s). All article content, except where
otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license
Except where otherwise noted, this item's license is described as © 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license