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http://dx.doi.org/10.5369/JSST.2004.13.5.350

UV Sensor using Evanescent Field Coupling of Prism and Fiber-to-Planar Waveguide Coupler  

Cho, Kang-Min (Department of Sensor Engineering, Kyungpook National University)
Yun, Jung-Hyun (Department of Sensor Engineering, Kyungpook National University)
Kim, Eung-Soo (Div. Digital Information Engineering, Pusan University of Foreign Studies)
Lee, Seung-Ha (School Electronic and Electrical Engineering, Kyungpook National University)
Kang, Shin-Won (School Electronic and Electrical Engineering, Kyungpook National University)
Publication Information
Journal of Sensor Science and Technology / v.13, no.5, 2004 , pp. 350-355 More about this Journal
Abstract
A novel UV sensor was manufactured and characterized using the evanescentfield coupling between fiber-planar waveguide (PWG) coupler and prism. A spiroxazine dye was chosen as planar waveguide because its photochromic isomerization induced by UV irradiation. A novel UV sensor was proposed to measure the variation of refractive index and absorption coefficient simultaneously. The wavelength responses of these sensors by UV exposure times were measured 0.48 nm/sec, 0.757 nm/sec, and ATR output power variations were measured $-0.424{\mu}W$/sec and $-0.62{\mu}W$/sec when UV exposure power were 3 mW and 5 mW, respectively.
Keywords
side-polished fiber; fiber-to-planar waveguide coupler;
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