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- W1966039141 abstract "Abstract A new fabrication procedure for integration of ultraviolet transparent pure‐silica planar waveguides, fiber couplers and high‐aspect ratio submicrometer channels is presented. Only a single photolithographic mask step is required. The channels are 80–90 μm deep and the width can be reduced to about 0.5 μm, corresponding to a height‐to‐width ratio of more than 150. The core of the waveguides consists of pure silicon dioxide, which is favorable over doped silica, due to the absence of absorption centers associated with the dopants. This furthermore improves the long‐term stability of the waveguides, because of an increased radiation resistance of the glass. The propagation loss decreases from 1.0 dB/cm at 200 nm to 0.2 dB/cm at 800 nm, which, to our knowledge, is the lowest propagation loss reported for integrated planar waveguides in the ultraviolet wavelength region to date. The effective optical path length is 1.2 mm for an absorbance cell with a nominal length of 1.0 mm, indicating effective suppression of stray light. The limit of detection for paracetamol when present in the entire channel network was determined to 3 μg/mL. Finally, the applicability of the fabricated devices for capillary electrophoresis was evaluated by separation of caffein, paracetamol and ketoprofone using absorbance detection at 254 nm." @default.
- W1966039141 created "2016-06-24" @default.
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- W1966039141 date "2004-11-01" @default.
- W1966039141 modified "2023-09-27" @default.
- W1966039141 title "Pure-silica optical waveguides, fiber couplers, and high-aspect ratio submicrometer channels for electrokinetic separation devices" @default.
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- W1966039141 doi "https://doi.org/10.1002/elps.200406077" @default.
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