Effect of taper geometries and launch angle on evanescent wave penetration depth in optical fibers

Mohammad Ahmad, Larry L. Hench

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

A large penetration depth of an evanescent wave is the key to success for developing an ultra high-resolution fiber-based evanescent wave biosensor. Tapering the fiber and launching light at an angle has the potential of increasing the penetration depth of evanescent wave manifolds. The effects of tapering, launch angle and taper length of the fiber have been explored in detail using a ray-tracing model to calculate the highest possible penetration depth of the evanescent field. Evanescent wave penetration depths of the order of the size of living cells have been achieved by optimizing the parameters relating geometry of tapered fibers.

Original languageEnglish
Pages (from-to)1312-1319
Number of pages8
JournalBiosensors and Bioelectronics
Volume20
Issue number7
DOIs
Publication statusPublished - Jan 15 2005
Externally publishedYes

Fingerprint

Optical Fibers
Biosensing Techniques
Cell Size
Optical fibers
Light
Geometry
Fibers
Evanescent fields
Launching
Ray tracing
Biosensors
Cells

Keywords

  • Biological and medical applications
  • Biosensors
  • Cells
  • Design and operation
  • Evanescent wave
  • Fluorescence
  • Lasers
  • Taper fiber

ASJC Scopus subject areas

  • Biotechnology
  • Analytical Chemistry
  • Electrochemistry

Cite this

Effect of taper geometries and launch angle on evanescent wave penetration depth in optical fibers. / Ahmad, Mohammad; Hench, Larry L.

In: Biosensors and Bioelectronics, Vol. 20, No. 7, 15.01.2005, p. 1312-1319.

Research output: Contribution to journalArticle

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