Utilising digital micro-mirror device (DMD) as scanning light source for light-addressable potentiometric sensors (LAPS)

T. Wagner, K. Miyamoto, C. F. Werner, M. J. Schöning, T. Yoshinobu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The light-addressable potentiometric sensor (LAPS) is a semiconductor-based chemical sensor that utilises light beams to address individual parts of the semiconductor chip for spatially resolved measurements. The photocurrent depends on the local chemical analyte concentration. Hence, a flexible and miniaturised light source which is capable of addressing a large number of measurement spots is desired. DMD (digital micro-mirror device) is a MEMS device well known as main technology for multimedia projectors. These micro-mirror arrays are used to define hundreds of thousands of light beams in a flexible way. In this work, the authors demonstrate the usage of the DMD technology to allow the definition of thousands of measurement spots on a LAPS structure. For each measurement spot a photocurrent versus bias voltage (lIV) curve can be recorded. A shift along the horizontal axis can be evaluated and the change of the analyte concentration at the measurement spot can be determined.

Original languageEnglish
Pages (from-to)812-815
Number of pages4
JournalSensor Letters
Volume9
Issue number2
DOIs
Publication statusPublished - 2011 Apr 1

Keywords

  • Chemical imaging
  • DMD
  • Digital mirror device
  • LAPS
  • Light addressable potentiometric sensors

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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