Waveguides With Gratings
Description
Principle of evanescent field sensing using thin film waveguides with sub-micrometric gratings for light coupling. The small extension of the evanescent field above the waveguide allows very high detection sensitivity.
Waveguides With Gratings
Features
High quality gratings, excellent homogeneity
Low defect ratio (also for large chip formats)
High repeatability at volume production
Competitive up-front costs
Combination with fluidic channels
Applications
Life science sensing applications
Analysis of living molecules in real time
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Switzerland
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Frequently Asked Questions
The principle involves using thin film waveguides with sub-micrometric gratings to couple light and utilize the small extension of the evanescent field above the waveguide for highly sensitive detection.
The waveguides with gratings offer high-quality gratings with excellent homogeneity, low defect ratio (even for large chip formats), high repeatability at volume production, and competitive up-front costs. They can also be combined with fluidic channels.
Waveguides with gratings are commonly used in life science sensing applications and for the analysis of living molecules in real time.
The benefits include high-quality gratings with excellent homogeneity, low defect ratio (even for large chip formats), high repeatability at volume production, and competitive up-front costs. They can also be combined with fluidic channels.
The substrate material is Schott D263T (or equivalent) with a refractive index of 1.52 at 633 nm. The waveguide material is Ta2O5 (or other oxides) with a refractive index of 2.12 at 633 nm. The waveguide thickness is 100 - 500 nm with an attenuation of < 3 dB/cm at 532 nm. The light coupling grating is a binary phase grating with a period of 300 - 1000 nm and a depth of 10 - 100 nm.