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Modeling of ZnO nanorods for evanescent field optical sensors
Author(s) -
Börner Sandra,
Rüter Christian E.,
Voss Tobias,
Kip Detlef,
Schade Wolfgang
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200723137
Subject(s) - nanorod , wavelength , materials science , evanescent wave , penetration depth , absorption (acoustics) , optoelectronics , infrared , optics , field (mathematics) , nanotechnology , physics , composite material , mathematics , pure mathematics
The optical wave guiding properties of ZnO nanorods are simulated and studied in detail using a block‐iterative frequency‐domain method and the results of a finite difference method as reference data. The simulations are performed for different wavelengths in the infrared spectral region that are related to specific gas absorption lines. Here both single ZnO nanorods and nanorod arrays with varying period lengths are investigated. The evanescent field distributions and penetration depths into the surrounding media are analyzed and compared as a function of wavelength and rod diameter. Our results give a general overview on the size range where ZnO nanorods may be used for evanescent field interaction based sensors for the detection of gas molecules like CO, CO 2 or O 2 . (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)