Thermal wave induced edge electrical field of pyroelectric: Spatial pattern mapping and effect of ambient conditions

A. V. Butenko, V. Sandomirsky, G. Chaniel, B. Shapiro, Y. Schlesinger, A. Jarov, V. A. Sablikov

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Abstract

We have recently analyzed theoretically the main characteristics of the edge depolarizing electric field (EDEF), in the vicinity of a nonpolar face of a pyroelectric. In this work, we measured and characterized the EDEF, excited by a harmonical thermal wave. We present here experimental results obtained on a pyroelectric crystal LiTaO3, confirming our theoretical predictions. The interpretation assumes an equivalent circuit of a pyroelectric capacitive current source. The effect of the air pressure at the pyroelectric/air interface, on the EDEF, was determined in the interval 103 - 10 -5 torr. We found that EDEF increases significantly with decreasing air pressure, presumably due to diminishing of adsorption screening at the polar faces. Teflon plates, covering the polar faces, prevent accumulation of screening charged particles, resulting in a significant increase in EDEF. Our experimental results highlight the feasibility of EDEF application in micro- and nanotechnology as a contactless controlled electrical field.

Original languageEnglish
Article number044106
JournalJournal of Applied Physics
Volume108
Issue number4
DOIs
StatePublished - 15 Aug 2010

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