期刊
APPLIED PHYSICS LETTERS
卷 93, 期 9, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.2978239
关键词
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资金
- FPI fellowship
- BMBF [03X5518]
The authors fabricate rolled up microtubes consisting of Si/SiO(x) on Si substrate and analyze the possibility to use them as a refractometric sensor. An aqueous sugar solution is inserted into the microtube, which leads to a change in refractive index and, as a result, to a detectable spectral shift of the whispering gallery modes. Experimental results can fit well with finite-difference time-domain simulations, which are used to determine the sensitivity of this tube refractometer. The ratio of spectral sensitivity to channel cross-sectional area of the refractometer is particularly striking and allows analysis of fluid volumes in the range of femtoliters. A comparative discussion with other existing refractometer schemes concludes this work. (c) 2008 American Institute of Physics.
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