A terahertz chemical microscope to visualize chemical concentrations in microfluidic chips

Toshihiko Kiwa, Shohei Oka, Junichi Kondo, Iwao Kawayama, Hironobu Yamada, Masayoshi Tonouchi, Keiji Tsukada

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Here, a new type of terahertz chemical microscope (TCM) is proposed and developed, and the first demonstration of imaging the chemical concentration in fluid channels is reported. Fluid samples flow through channels possessing a semiconductor sensing plate as a bottom wall. Terahertz (THz) waves are radiated from the sensing plate as a result of femtosecond laser illumination. Because the amplitude of the THz radiation depends on the concentration of ions adsorbed on the surface of the plate, the ion distribution in the fluid channels can be visualized by scanning the laser across the plate. An image showing separated solutions with two different proton concentrations is successfully observed as the first demonstration of this instrument.

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume46
Issue number41-44
DOIs
Publication statusPublished - Nov 9 2007

Fingerprint

Microfluidics
Microscopes
chips
microscopes
Fluids
Demonstrations
Terahertz waves
fluids
Ions
Ultrashort pulses
ion distribution
Protons
channel flow
Lighting
Semiconductor materials
lasers
Scanning
Imaging techniques
Radiation
Lasers

Keywords

  • Chemical sensor
  • Femtosecond laser
  • Imaging
  • Microfluidic
  • Terahertz

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

A terahertz chemical microscope to visualize chemical concentrations in microfluidic chips. / Kiwa, Toshihiko; Oka, Shohei; Kondo, Junichi; Kawayama, Iwao; Yamada, Hironobu; Tonouchi, Masayoshi; Tsukada, Keiji.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 46, No. 41-44, 09.11.2007.

Research output: Contribution to journalArticle

Kiwa, Toshihiko ; Oka, Shohei ; Kondo, Junichi ; Kawayama, Iwao ; Yamada, Hironobu ; Tonouchi, Masayoshi ; Tsukada, Keiji. / A terahertz chemical microscope to visualize chemical concentrations in microfluidic chips. In: Japanese Journal of Applied Physics, Part 2: Letters. 2007 ; Vol. 46, No. 41-44.
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