Real time chemical detection using species selective thin films and waveguide Zeeman interferometry

Conference · Tue Dec 01 00:00:00 EST 1998

OSTI ID:296631

Grace, K M; Shrouf, K ^[1]; Honkanen, S ^[2]

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1. Los Alamos National Lab., NM (United States)
2. Univ. of Arizona, Tucson, AZ (United States). Optical Sciences Center; and others

The authors present a chemical sensor scheme based on selective sensing surfaces and highly sensitive integrated optical transduction methods. Using self-assembly techniques, species selective thin-films are covalently attached to the surface of Si{sub 3}N{sub 4} channel waveguides to produce robust sensor elements. Exposure to targeted analytes results in the selective absorption of these molecules onto the waveguide surface causing a change in the effective index of the guided modes. These relative changes in effective index between TE and TM modes are precisely measured using Zeeman interferometry. Measurements demonstrate reversible, real time sensing of volatile organic compounds at ppm levels.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States); USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 296631
• Report Number(s): LA-UR-98-1530; CONF-980412-; ON: DE99000703; TRN: AHC29903%%29
• Resource Relation: Conference: 12. annual international symposium on aerospace/defense sensing, simulation and controls, Orlando, FL (United States), 13-19 Apr 1998; Other Information: PBD: [1998]
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
54 ENVIRONMENTAL SCIENCES
INTERFEROMETERS
AIR POLLUTION MONITORS
INTEGRATED CIRCUITS
SILICON NITRIDES
WAVEGUIDES
ZEEMAN EFFECT
GAS ANALYSIS
REFRACTIVE INDEX
TOLUENE
ECOLOGICAL CONCENTRATION