Scientific Results

A nondestructive dynamic characterization of a microheater through digital holographic microscopy

Year: 2007

Authors: Coppola G., Striano V., Ferraro P., De Nicola S., Finizio A., Pierattini G., Maccagnani P.

Autors Affiliation: Istituto per la Microelettronica e i Microsistemi del CNR, Sezione di Napoli, Via P. Castellino 111, 80134 Napoli, Italy;
University of Reggio Calabria, 89125 Reggio Calabria, Italy;
CNR – Istituto Nazionale di Ottica Applicata, Sez. di Napoli, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
Istituto di Cibernetica “E. Caianiello” del CNR, 80072 Pozzuoli (NA), Italy;
Istituto per la Microelettronica e i Microsistemi del CNR, 40129 Bologna, Italy

Abstract: This paper describes the possibility of employing a digital holographic microscope (DHM) to carry out a noncontact and nondestructive characterization of a microheater integrated on a silicon nitride membrane and subjected to a high thermal load. Microheaters can be affected by the presence of the residual stress due to the technological processes appearing in the form of undesired bowing of the membrane. Moreover, when the temperature of the microheater increases, a further warpage of the structure can be induced. A DHM allows for evaluation, with high accuracy, the deformations due to the residual stress and how these deformations are affected by the thermal loads due to the microheater operating mode. In particular, this dynamic analysis is made possible by measuring the unwanted longitudinal displacement induced by the thermal expansion of both the device and its mechanical support. Taking into account this displacement, it is possible to have a continuous monitoring of profile deformation induced by the working condition of the microheater.

Journal/Review: JOURNAL OF MICROELECTROMECHANICAL SYSTEMS

Volume: 16 (3)      Pages from: 659  to: 667

KeyWords: holographic interferometry; nondestructive testing; thermoelectric devices
DOI: 10.1109/JMEMS.2007.896707

Citations: 15
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English