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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 20 — Sep. 24, 2012
  • pp: 22208–22223

The effect of silicon loss and fabrication tolerance on spectral properties of porous silicon Fabry-Perot cavities in sensing applications

U. C. Hasar, I. Y. Ozbek, E. A. Oral, T. Karacali, and H. Efeoglu  »View Author Affiliations


Optics Express, Vol. 20, Issue 20, pp. 22208-22223 (2012)
http://dx.doi.org/10.1364/OE.20.022208


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Abstract

In this paper, we investigate the effect of non-uniformities (enlargement of current passage, non-equal surface current densities, etc.) in axial as well as transverse directions of a porous silicon Fabry-Perot (FP) cavity as well as loss nature of bulk silicon on spectral properties of this cavity, even that cavity is created with an anisotropic etching process. Without correct and comprehensive characterization of such cavities by incorporating these non-uniformities and inherent lossy nature of a cavity, detection and identification of biological and chemical molecules by that cavity may yield unpredictable and misleading results. From our simulations, we note the following two key points. First, effects of the refractive index and the thickness of microcavity region of a lossless or lossy FP cavity on resonance wavelength is more prevailing than those of first and last layers. Second, the effect of some small loss inside the FP cavity is not detectable by the measurement of resonance wavelength whereas the same influence is noticeable by the measurement of reflectivity. We carried out some measurements from two different regions on the fabricated cavities to validate our simulation results. From a practical point of view in correct detection and/or identification of lossy biological or chemical vapor by FP cavities, we conclude that not only the measurement of resonance wavelength as well as its shift but also the reflectivity value at the resonance wavelength or some specific wavelengths should be utilized.

© 2012 OSA

OCIS Codes
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.2440) Instrumentation, measurement, and metrology : Filters
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(280.1415) Remote sensing and sensors : Biological sensing and sensors
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Sensors

History
Original Manuscript: July 16, 2012
Revised Manuscript: August 10, 2012
Manuscript Accepted: August 12, 2012
Published: September 13, 2012

Virtual Issues
Vol. 7, Iss. 11 Virtual Journal for Biomedical Optics

Citation
U. C. Hasar, I. Y. Ozbek, E. A. Oral, T. Karacali, and H. Efeoglu, "The effect of silicon loss and fabrication tolerance on spectral properties of porous silicon Fabry-Perot cavities in sensing applications," Opt. Express 20, 22208-22223 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-20-22208


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