TiO2 surface functionalization of COC based planar waveguide Bragg gratings for refractive index sensing
TiO2 surface functionalization of COC based planar waveguide Bragg gratings for refractive index sensing
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DOI：
10.1088/2040-8986/aa9bcf
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发表时间：
2018-01-01
影响因子：
2.1
通讯作者：
Hellmann, R.
中科院分区：
文献类型：
--
作者：
Rosenberger, M.;Girschikofsky, M.;Hellmann, R.
我们证明了平面波导布拉格光栅在环烯烃共聚物（COC）的折射率传感的适用性。聚合物平面波导布拉格光栅使用一个单一的写入步骤技术制造的涂覆有高折射率层的二氧化钛（TiO 2），导致一个独特的双折射。这又导致布拉格反射分裂成两个不同的布拉格波长，这两个波长在折射率灵敏度方面有很大差异。在一个波长仅受环境折射率轻微影响的情况下，第二布拉格峰显示出强灵敏度。此外，我们调查的功能化传感器的温度行为，并讨论它在折射率传感方面的应用。
We demonstrate the applicability of a planar waveguide Bragg grating in cyclo-olefin copolymer (COC) for refractive index sensing. The polymer planar waveguide Bragg grating fabricated using a single writing step technique is coated with a high-index layer of titanium dioxide (TiO2) leading to a distinct birefringence. This in turn results in the splitting of the Bragg reflection into two distinct Bragg wavelengths, which strongly differ regarding their refractive index sensitivities. Where one wavelength is only slightly affected by the ambient refractive index, the second Bragg peak shows a strong sensitivity. Furthermore, we investigate the temperature behaviour of the functionalized sensor and discuss it with respect to applications in refractive index sensing.