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Sensors 2009, 9(6), 4559-4571; doi:10.3390/s90604559
Article

Characterization of Long-period Grating Refractive Index Sensors and Their Applications

Hiroshi Tsuda* email and Kei Urabeemail
Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science & Technology, Tsukuba Central 2, Tsukuba 305-8568, Japan
* Author to whom correspondence should be addressed.
Received: 25 May 2009; in revised form: 6 June 2009 / Accepted: 9 June 2009 / Published: 10 June 2009
(This article belongs to the Section Chemical Sensors)
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Abstract: The influence of grating length and bend radius of long-period gratings (LPGs) on refractive index sensing was examined. Sensitivity to refractive indexes smaller than that of silica could be enhanced by bending LPGs. Bent LPGs lost sensitivity to refractive indexes higher than that of silica, whereas a 20-mm-long LPG arranged in a straight line had considerable sensitivity. These experimental results demonstrated that the sensitivity characteristics of LPGs to refractive index could be controlled by grating length and bend radius.
Keywords: long-period grating; refractive index; spectral sensitivity

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MDPI and ACS Style

Tsuda, H.; Urabe, K. Characterization of Long-period Grating Refractive Index Sensors and Their Applications. Sensors 2009, 9, 4559-4571.

AMA Style

Tsuda H., Urabe K. Characterization of Long-period Grating Refractive Index Sensors and Their Applications. Sensors. 2009; 9(6):4559-4571.

Chicago/Turabian Style

Tsuda, Hiroshi; Urabe, Kei. 2009. "Characterization of Long-period Grating Refractive Index Sensors and Their Applications." Sensors 9, no. 6: 4559-4571.

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