Abstract
Interferometry is an optical technique that compares the differences experienced by two light beams traveling along similar paths. Planar waveguides have evanescent fields sensitive to changes in the index of refraction in the volume immediately above the waveguide surface. Placing a chemically sensitive film within this region provides the basis for chemical sensing. Film–analyte interactions change the index of refraction, causing the propagating light speed or phase to change in a direction of opposite sign to that of the index change. To measure this change, a reference propagating beam, which is adjacent to the sensing beam, is combined optically with the sensing beam, thus creating an interference pattern of alternating dark and light fringes. When chemical or physical changes occur in the sensing arm, the interference pattern shifts, producing a sinusoidal output. Waveguides and interferometers come in a variety of designs, but all rely on the evanescent field interacting with a chemically selective film to produce a measured response. The sensing mechanism can be passive (a physical change) or active (reactive sites in the film). Through a judicious choice of sensing films, interferometers can be designed to detect a wide variety of chemical and biological materials. Multi-interferometer devices with several different sensing films can be used to detect and identify a variety of different chemical or biological analytes either through specific sensing chemistry or through analysis of patterned response from an array of different films.
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Abbreviations
- FTIR:
-
Fourier transform infrared spectroscopy
- TM:
-
Transverse magnetic
- TE:
-
Transverse electric
- ARROW:
-
Anti-resonant reflecting optical waveguide
- Teflon AF® :
-
Teflon amorphous fluoropolymer – Dupont trademark
- HEPES:
-
(4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) buffer
- TCE:
-
Trichloroethylene
- DCE:
-
1,2-dichloroethylene
- VC:
-
Vinyl chloride
- TNT:
-
2,4,6-trinitrotoluene
- BTEB:
-
Bis(trimethoxysilylethyl)benzene
- IMTS:
-
Iodotrimethylsilane
- SAW:
-
Surface acoustic wave
- SWG:
-
Super white glass
- TATP:
-
Triacetone triperoxide
- TIR:
-
Total internal reflection
- Ï•:
-
Phase
- n :
-
Refractive index
- n c :
-
Cover refractive index
- n s :
-
Substrate refractive index
- n f :
-
Waveguide film refractive index
- n eff :
-
Effective mode index
- n o :
-
Ordinary refractive index of birefringent material
- λ:
-
Wavelength
- L:
-
Pathlength
- W eff :
-
Effective waveguide thickness
- m:
-
Mode number
- z c :
-
Lateral phase shift in the cover
- z s :
-
Lateral phase shift in the substrate
- β :
-
Propagation constant
- Λ :
-
Fringe period
- Tg:
-
Glass transition temperature
- pKa:
-
Acidity constant
- dn/dT :
-
Refractive index change with change in temperature
- χc :
-
Optical beam's penetration in the cover
- χs :
-
Optical beam's penetration in the substrate
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Campbell, D.P. (2010). Planar-Waveguide Interferometers for Chemical Sensing. In: Zourob, M., Lakhtakia, A. (eds) Optical Guided-wave Chemical and Biosensors I. Springer Series on Chemical Sensors and Biosensors, vol 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-88242-8_3
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