期刊
SMALL
卷 8, 期 12, 页码 1937-1944出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201102290
关键词
diffraction; nanorings; optical fibers; refractive index; sensors
类别
资金
- National Natural Science Foundation of China [11074018]
- Program for New Century Excellent Talents in University (NCET)
- Research Fund for the Doctoral Program of Higher Education of China (RFDP) [20091103110012]
- DAAD-CSC academic exchange program
A polarization-independent optical sensor is created by fabricating a concentric gold ring grating with a period of 900 nm on the end facet of an optical fiber. The sensing function of this miniaturized device is realized by sending white light as a probe to the gold rings and collecting the response signal in the back-reflection through the optical fiber. A pronounced peak due to the Rayleigh anomaly of the gold ring grating is observed in the reflection spectrum, the center wavelength of which is sensitive to the change in the environmental refractive index of the fiber end facet. Theoretical analysis not only shows excellent agreement with the experimental results, but also gives insights into the mechanisms of this kind of sensor. Using the center position of the Rayleigh peak as the response signal, a high sensitivity d?/dn of 900 nm per unity refractive index is realized for this sensor and a resolution of ?n/n similar to 1% is demonstrated in preliminary experiments. The sensitivity is solely determined by the period of the grating.
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