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Tunable thin films as sensors: a family of microtunable thin-film filters originally developed for the telecom industry is enabling new classes of near- and mid-IR optical spectral sensors suitable for trace gas detection, Raman analysis, and 2D lab-on-a-chip applications.(SENSOR TECHNOLOGY AND DESIGN)
Sensors Magazine
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September 1, 2005|
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Thin-film interference coatings have been used in commercial optical systems since the 1930s for purposes ranging from antireflection coatings to bandpass filters. Created by stacking transparent films of different refractive index materials to create specific reflectance or transmission properties, such coatings, in most cases, have been designed with fixed characteristics. Only recently has a practical technology emerged to create tunable versions of thin-film filters, and this gives rise to a host of applications not only for communications but also for many types of ...
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