Ion sensing for nano liter level solution by a terahertz chemical microscopy

Y. Zhou, K. Akimune, K. Sakai, T. Kiwa, K. Tsukada

Research output: Chapter in Book/Report/Conference proceedingConference contribution


There are various ions in our body, such as sodium ion and potassium ion. Breaking of ion balances will lead to serious diseases. Therefore, the sensing systems for ions are required in the medical diagnoses. Conventionally, the distribution of ions is measured by the ion chromatography. However, this system can not separate ions that have similar magnitude of polarities. Our group developed a detection system named THz Chemical Microscope (TCM), which can use the amplitude of THz wave to visualize the chemical potential changes in the water solution. A device named the sensing plate is that the amplitude of radiated THz wave changes if there are chemical reactions on the sensing plate. Ion sensitive membranes are immobilized on the surface of SiO2 side of THz sensing plate and dropped the ion solution with different concentration, which lead to different amplitude of radiated THz wave. Therefore, ions in solution can be detected by TCM. In this work, we first detected the amplitude of THz wave changes with dropping nano liter level water. From this result, ions can be detected by using several hundred μm size ion sensitive membrane.

Original languageEnglish
Title of host publicationJSAP-OSA Joint Symposia, JSAP 2015
PublisherOptica Publishing Group (formerly OSA)
ISBN (Electronic)9784863485419
ISBN (Print)9784863485419
Publication statusPublished - 2015
EventJSAP-OSA Joint Symposia 2015 - Nagoya, Japan
Duration: Sept 13 2015Sept 16 2015

Publication series

NameOptics InfoBase Conference Papers
VolumePart F132-JSAP 2015
ISSN (Electronic)2162-2701


ConferenceJSAP-OSA Joint Symposia 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials


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