Chemical sensing in Fourier space

Thundat, T.; Finot, E.; Hu, Z.; Ritchie, R. H.; Ritchie, R.H.; Wu, G.; Majumdar, A.
December 2000
Applied Physics Letters;12/11/2000, Vol. 77 Issue 24
Academic Journal
Chemical sensing using optical diffraction from an array of microcantilevers is demonstrated. Properly fashioned arrays of micromachined silicon-nitride cantilevers containing embedded deformable diffraction gratings are functionalized with chemically selective coatings. Adsorption of specific molecules on the cantilever leads to bending, which changes the diffraction pattern of a laser beam reflecting off the array. Quantitative chemical information can be obtained by monitoring the displacement of diffraction peaks as a function of analyte exposure. © 2000 American Institute of Physics.


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