Chemical sensing plate with a laser-terahertz monitoring system

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

doi:10.1364/AO.47.003324

Chemical sensing plate with a laser-terahertz monitoring system

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

Research output: Contribution to journal › Article › peer-review

66 Citations (Scopus)

Abstract

A new type of laser-terahertz emission system for noncontact investigations of chemical solutions has been developed. The system monitors terahertz emission from a sensing plate, which consists of silicon oxide and silicon thin film layers on a sapphire substrate. Sensing of chemical solutions with pH values between 1.68 and 10.01 was demonstrated. The amplitude of the terahertz emission from the sensing plate increased with increasing pH value. This change in the amplitude was caused by a change in the depletion layers of the silicon thin film when protons were adsorbed on the surface of the sensing plate. This study demonstrates that full noncontact monitoring of chemical solutions is possible using the laserterahertz emission system.

Original language	English
Pages (from-to)	3324-3327
Number of pages	4
Journal	Applied Optics
Volume	47
Issue number	18
DOIs	https://doi.org/10.1364/AO.47.003324
Publication status	Published - Jun 20 2008

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Engineering (miscellaneous)
Electrical and Electronic Engineering

Access to Document

10.1364/AO.47.003324

Cite this

@article{dab391a02d044c369ee1227c78bfca4f,

title = "Chemical sensing plate with a laser-terahertz monitoring system",

abstract = "A new type of laser-terahertz emission system for noncontact investigations of chemical solutions has been developed. The system monitors terahertz emission from a sensing plate, which consists of silicon oxide and silicon thin film layers on a sapphire substrate. Sensing of chemical solutions with pH values between 1.68 and 10.01 was demonstrated. The amplitude of the terahertz emission from the sensing plate increased with increasing pH value. This change in the amplitude was caused by a change in the depletion layers of the silicon thin film when protons were adsorbed on the surface of the sensing plate. This study demonstrates that full noncontact monitoring of chemical solutions is possible using the laserterahertz emission system.",

author = "Toshihiko Kiwa and Junichi Kondo and Shohei Oka and Iwao Kawayama and Hironobu Yamada and Masayoshi Tonouchi and Keiji Tsukada",

year = "2008",

month = jun,

day = "20",

doi = "10.1364/AO.47.003324",

language = "English",

volume = "47",

pages = "3324--3327",

journal = "Applied Optics",

issn = "1559-128X",

publisher = "The Optical Society",

number = "18",

}

TY - JOUR

T1 - Chemical sensing plate with a laser-terahertz monitoring system

AU - Kiwa, Toshihiko

AU - Kondo, Junichi

AU - Oka, Shohei

AU - Kawayama, Iwao

AU - Yamada, Hironobu

AU - Tonouchi, Masayoshi

AU - Tsukada, Keiji

PY - 2008/6/20

Y1 - 2008/6/20

N2 - A new type of laser-terahertz emission system for noncontact investigations of chemical solutions has been developed. The system monitors terahertz emission from a sensing plate, which consists of silicon oxide and silicon thin film layers on a sapphire substrate. Sensing of chemical solutions with pH values between 1.68 and 10.01 was demonstrated. The amplitude of the terahertz emission from the sensing plate increased with increasing pH value. This change in the amplitude was caused by a change in the depletion layers of the silicon thin film when protons were adsorbed on the surface of the sensing plate. This study demonstrates that full noncontact monitoring of chemical solutions is possible using the laserterahertz emission system.

AB - A new type of laser-terahertz emission system for noncontact investigations of chemical solutions has been developed. The system monitors terahertz emission from a sensing plate, which consists of silicon oxide and silicon thin film layers on a sapphire substrate. Sensing of chemical solutions with pH values between 1.68 and 10.01 was demonstrated. The amplitude of the terahertz emission from the sensing plate increased with increasing pH value. This change in the amplitude was caused by a change in the depletion layers of the silicon thin film when protons were adsorbed on the surface of the sensing plate. This study demonstrates that full noncontact monitoring of chemical solutions is possible using the laserterahertz emission system.

UR - http://www.scopus.com/inward/record.url?scp=49649123783&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=49649123783&partnerID=8YFLogxK

U2 - 10.1364/AO.47.003324

DO - 10.1364/AO.47.003324

M3 - Article

C2 - 18566628

AN - SCOPUS:49649123783

SN - 1559-128X

VL - 47

SP - 3324

EP - 3327

JO - Applied Optics

JF - Applied Optics

IS - 18

ER -

Chemical sensing plate with a laser-terahertz monitoring system

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this