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The device is composed by a thermal actuated Mach\u2010Zehnder (MZ) interferometer operating with a switching power of 0.011 W and a maximum temperature difference between branches of 0.89 \u00baC. The MZ interferometer is covered by a Eu<jats:sup>3+<\/jats:sup>\/Tb<jats:sup>3+<\/jats:sup> co\u2010doped di\u2010ureasil luminescent molecular thermometer with a temperature uncertainty of 0.1\u00baC and a spatial resolution of 13 \u00b5m. This is an uncommon example in which the same material (an organic\u2010inorganic hybrid) that is used to fabricate a particular device (a thermal\u2010actuated MZ interferometer) is also used to measure one of the device intrinsic properties (the operating temperature). The photonic\u2010on\u2010a\u2010chip example discussed here can be applied to sense temperature gradients with high resolution (10<jats:sup>\u22123<\/jats:sup> \u00baC\u00b7\u00b5m<jats:sup>\u22121<\/jats:sup>) in chip\u2010scale heat engines or refrigerators, magnetic nanocontacts and energy\u2010harvesting machines.<\/jats:p>","DOI":"10.1002\/lpor.201300080","type":"journal-article","created":{"date-parts":[[2013,10,11]],"date-time":"2013-10-11T21:46:53Z","timestamp":1381528013000},"page":"1027-1035","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":53,"title":["Photonic\u2010on\u2010a\u2010chip: a thermal actuated Mach\u2010Zehnder interferometer and a molecular thermometer based on a single di\u2010ureasil organic\u2010inorganic hybrid"],"prefix":"10.1002","volume":"7","author":[{"given":"Rute A. 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