发明名称 |
Method and apparatus for enhanced evanescent fluorescence and color filtering using a high refractive index thin film coating |
摘要 |
A technique for increasing the excitation and collection of evanescent fluorescence radiation emanating from a fiber optic sensor having a high refractive index (nr), dielectric thin film coating has been disclosed and described. The invention comprises a clad optical fiber core whose cladding is removed on a distal end, the distal end coated with a thin, non-porous, titanium dioxide sol-gel coating. It has been shown that such a fiber will exhibit increased fluorescence coupling due in part by 1) increasing the intensity of the evanescent field at the fiber core surface by a constructive interference effect on the propagating light, and 2) increasing the depth of penetration of the field in the sample. The interference effect created by the thin film imposes a wavelength dependence on the collection of the fluorescence and also suggests a novel application of thin films for color filtering as well as increasing collected fluorescence in fiber sensors. Collected fluorescence radiation increased by up to 6-fold over that of a bare fused silica fiber having a numerical aperture (N.A.) of O.6.
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申请公布号 |
US6188812(B1) |
申请公布日期 |
2001.02.13 |
申请号 |
US19990238473 |
申请日期 |
1999.01.28 |
申请人 |
KAO HUNG PIN;SCHOENIGER JOSEPH;YANG NANCY |
发明人 |
KAO HUNG PIN;SCHOENIGER JOSEPH;YANG NANCY |
分类号 |
G01N21/55;G01N21/64;G01N21/77;G02B6/26;G02B6/42;(IPC1-7):G02B6/00 |
主分类号 |
G01N21/55 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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