Fabrication and optical characterization of single-mode polymeric embedded waveguides are performed. A specific material combination (SU-8 2005 as core and the modified SU-8 mr-L 6050XP as cladding) is chosen in order to obtain a small refractive index difference for single-mode propagation combined with the conventional fabrication method UV lithography to facilitate the integration of different types of optical detection methods on lab-on-a-chip systems. We analyze the behavior of the refractive index and carefully observe how the value of the refractive index can be tailored during processing. We show that we can fabricate waveguides with an index difference in the order of 10-3 , where both the core material and the cladding material are based on SU-8. The refractive index measurements are performed on thin polymeric films, while further optical characterizations are performed on waveguides with a height of 4.5 mum. We study the mode profiles of these waveguides and confirm that only the fundamental mode is excited. We also study the absorption spectra of the material in the wavelength range 800-1600 nm combined with cut-back measurements. We find that the waveguides have a propagation loss of 0.2-3 dB/cm in this wavelength range.
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机译:执行单模聚合物嵌入式波导的制造和光学表征。选择一种特定的材料组合(以SU-8 2005为核心,并使用改良的SU-8 mr-L 6050XP作为包层),以便获得与传统制造方法UV光刻相结合的单模传播较小的折射率差在芯片实验室系统上集成不同类型的光学检测方法。我们分析折射率的行为,并仔细观察如何在加工过程中调整折射率的值。我们表明,我们可以制造折射率差约为10-3的波导,其中芯材和包层材料均基于SU-8。折射率测量是在聚合物薄膜上进行的,而进一步的光学特性是在高度为4.5 mm的波导上进行的。我们研究了这些波导的模式轮廓,并确认仅激发了基本模式。我们还结合缩减测量研究了材料在800-1600 nm波长范围内的吸收光谱。我们发现,在此波长范围内,波导的传播损耗为0.2-3 dB / cm。
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