PH measurements in 16-nL-volume solutions using terahertz chemical microscopy

Toshihiko Kiwa, Tatsuki Kamiya, Taiga Morimoto, Kenji Sakai, Keiji Tsukada

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Terahertz chemical microscopy has been developed for measuring the pH of a solution using only a small volume. The microsolution wells were fabricated on the surface of the sensing plate using a conventional photolithograph technique. Because the pH value can be calculated from the amplitude of a terahertz wave directly radiated from a sensing plate by a femtosecond laser irradiation, this method does not require any reference electrode in the solution. Thus, pH measurement can be achieved with a volume as small as 16 nL.

Original languageEnglish
Pages (from-to)8232-8238
Number of pages7
JournalOptics Express
Issue number7
Publication statusPublished - Apr 2 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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