Photothermal dielectric spectroscopic microscope

Yasuo Cho, Tomoyuki Kumamaru

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


A new photothermal technique is proposed. It is based on the temperature characteristic of the dielectric constant of light-irradiated material. When chopped light is absorbed in a dielectric material, an alternating variation of capacitance is caused by the heat produced due to light absorption and is detected by using a frequency demodulation technique. A quantitative derivation is presented for the alternating capacitance variation in terms of the optical, thermal, dielectric, and geometric parameters of the system. The experimental results for lead zirconate titanate ceramics, barium titanate single-crystal, TiO2-Bi2Ti4O11 ceramics, and ethyl alcohol are shown, where the observed signals agree with theoretical ones very well.

Original languageEnglish
Pages (from-to)19-28
Number of pages10
JournalReview of Scientific Instruments
Issue number1
Publication statusPublished - 1996 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation


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