Optical interference filters

This chapter describes the synthesis of partially fluorinated polyimides for optical teleconununications applications," " 2 their optical transparency (optical loss), refractive index, and birefringence properties" in addition to their fundamental properties. It also describes their device application as optical interference filters," " optical waveplates," and optical waveguides." -" ... 

Optical Interference Filters on Optical Fluorinated Polyimides... 

When sulfur and phosphorus compounds are burned in an FDD-type flame, chemiluminescent species are produced that produce light at 393 nm (sulfur) and 526 nm (phosphorous). An optical interference filter passes the appropriate light to a photomultiplier tube, a sensitive photon detector. These detectors are known as flame photometric detectors (FPD).. ... 

Broadband optical filters and narrow bandwidth optical interference filters for providing phototaxis stimuli and for microscopic detection of the cells. 

PSi and porous polymer substrates for optical chemical sensors are discussed by Hajj-Hassan et al. (2010). They were used as substrates to encapsulate gaseous oxygen (O2) responsive luminophores in their nanostructured pores. These substrate materials behave as optical interference filters that allow efficient and selective detection of the wavelengths of interest in optical sensors. 

Fig. 3 Cross-sectional TEM (left) and SEM (middle) images of a PS-based optical interference filter. (Right) Microcavity...

Other optical communication components such as optical interference filter [187] and optical wave-plate [207] have also been developed by precisely controlling the degree of uniaxial chain orientation and film thickness of fluorinated Pis. 

The near-infrared (NIR) region of the electromagnetic spectrum was discovered by William Her-schel [8] in 1800. However, it was not until the 1950s that suitable sources and sensitive lead sulfide detectors [9] were available for NIR instrumentation. In 1954, engineers at DuPont developed an NIR process analyzer using the newly discovered lead sulfide detector and an Ebert monochromator for dispersion. The same group developed a workhorse NIR process analyzer using the lead sulfide detectors and optical interference filters [10]. 

AC Greenham, BA Nichols, RM Wood, KL Lewis. Optical interference filters with continuous refractive index modulations by microwave plasma-assisted chemical vapor deposition. Opt Eng 32 1018-1024, 1993. 

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